Molecular Separation Man of India
Leaving DRDO in 1997 was a leap of faith for me. I had spent 15 years working with missiles, developing India’s first titanium air bottle and facilitating the industry interface for the indigenous production of astronautical-grade aluminium alloys, as well as AKASH missile airframes. By creating a special stainless steel to make an indigenous coronary (Kalam-Raju) stent, I opted to work on the broader technology ecosystem across organisations.
Dr Kalam was there for me as both my flag and my flagpole. People listened to what I said and helped in the best way they could. Working with Dr. Kalam, I met some of the best minds in scientific laboratories, universities and industries, and developed a great interdisciplinary network across organisations, breathing innovation into societal missions. One such contact was Dr S. Sridhar, whom I met at the CSIR-Indian Institute of Chemical Technology (IICT) during the development of a machine for creating water from atmospheric air in 2018 by Maithri Aquatech, a company founded by my friend M. Ramakrishna.
Hailing from a Tamil lineage in southern India, Sridhar’s father served in the Indian Army and settled in Hyderabad, where Sridhar was born and brought up. He graduated in Chemical Engineering and went on to specialise in molecular separation. Any young scientist faces a fork in life – one road leads to application, while the other leads to specialisation. On one path, you spread out over several areas; in another, you dig deep into one field. Dr Sridhar is unique in that, while he has delved deep into his chosen subject, he has kept the application of his work active by training 500 engineering and science graduates.
Dr Sridhar joined IICT as a Research Assistant in 1995, was promoted to Scientist in 1998, and has been working there ever since. His career exemplifies the progress of membrane technology in molecular separation. Over the years, Sridharhas developed pilot plants based on technologies that were patented as they evolved – electrodialysis, nanofiltration, gas permeation, pervaporation, forward osmosis, membrane distillation and reverse osmosis, with capacities ranging from 500 to 5000 litres per hour for solvent recovery, effluent treatment and gas purification, serving the pharmaceutical, steel, textile, aroma and petrochemical industries. He has developed several indigenous membranes for fuel cellapplications.
Dr Sridhar has to his credit more than 70 water purification plants, ensuring safe drinking water for people living in remote areas, affected by waterborne diseases such as fluorosis, gastroenteritis, jaundice and typhoid, across ten states in India. Every purification method is unique and must be tailored to efficiently and reliably filter out the root cause, while also being affordable. Local people must be able to maintain these plants themselves. This is the challenge where most others failed, but Dr Sridhar proved otherwise. Other significant societal contributions with far-reaching impacts include an import-substitute device for producing ultrapure medical-grade water and an affordable, washable, multi-layered facemask to counter COVID-19, which led to the creation of several start-ups.
Molecular separation technology stands as a cornerstone in the domains of chemistry, biochemistry and materials science. It involves isolating specific molecules from complex mixtures based on their physical and chemical properties, which is critical for applications spanning pharmaceuticals, environmental science, petrochemicals and biotechnology. In India, Prof Sirshendu De at IIT Kharagpur was the pioneer in this field.
The roots of molecular separation can be traced back to Russia with the development of chromatography. The introduction of solid-phase columns and more efficient detection methods allowed for enhanced resolution and sensitivity in analysing complex mixtures. Innovations in polymer science led to membranes with remarkable selectivity, durability and scalability, enabling their application in water purification and medical devices. Computational models and advanced materials transformed distillation setups, making them more energy-efficient and precise.
The maturation of molecular separation technology has ushered in cutting-edge methodologies that leverage computational power and nanotechnology. Today, researchers rely on hybrid approaches that combine multiple separation techniques to achieve unprecedented levels of efficiency.
Nanotechnology plays a pivotal role in refining molecular separation. Nanoporous membranes, for instance, exhibit exceptional selectivity, enabling the separation of molecules based on their size, shape and chemical affinity. These membranes are increasingly utilised in desalination, gas separation and selective molecular capture applications.
With the discovery of natural gas, the Indian petroleum industry faced new challenges. Natural gas is a mixture of different molecules that must be purified from CO2 and H2S to enrich methane. The petrochemical industry heavily relies on C2 and C3–olefins as feedstock to produce a vast array of chemical intermediates and final products. Separation of propylene from propane is essential for a wide range of chemical products, including plastics and solvents. Separation of CO2 from power plant off-gases or its direct air capture for agricultural purposes could reduce the increasingly alarming effects of global warming. Dr. Sridhar’s mission was to improve membrane permeability and selectivity, leading to higher yields and reduced energy consumption, which ultimately earned him the title of ‘Molecular Separation Man of India’, as evidenced by the 75 prestigious awards he has received. His work, his team, and above all, his zeal will not only benefit the Indian petroleum industry but also enhance its global role in the years to come.
The future of molecular separation technology is closely tied to interdisciplinary collaboration and technological convergence. Emerging fields such as quantum computing and synthetic biology are likely to redefine the boundaries of molecular separation. Quantum algorithms can simulate molecular interactions with unparalleled precision, paving the way for designing separation systems tailored to specific chemical profiles. Custom-designed biological molecules, such as engineered enzymes, can act as highly selective agents in molecular separation processes, opening new horizons in medicine and materials science.
The maturation of molecular separation technology reflects humanity’s unwavering quest to manipulate matter at its most fundamental level. From early chromatography to cutting-edge nanotechnologies, this field continues to evolve, addressing global challenges and enabling scientific breakthroughs. As researchers and industries forge ahead, the transformative potential of molecular separation will undoubtedly shape the future of science, technology and sustainability.
It was natural for me to understand the role of Dr. Sridhar’swork in biomedical engineering. I recall meeting a Russian cardiologist in 1999 who used plasmapheresis to separate cholesterol from blood, a process similar to dialysis. A few sessions of plasmapheresis per year can help alleviate the side effects of statins. Russians also remove blood ammonia by this process to help the liver recover. These are all proven methods and established technologies, but their wider application is fraught with commercial forces and the formidable medical-pharmaceutical industry.
As a scientist, Dr Sridhar feels that molecular separation technologies are integral to drug development and diagnostics. Affinity chromatography, for example, is used in the purification of monoclonal antibodies and other biologics. Moreover, microfluidics-based separation systems are gaining traction for their capacity to isolate single cells or molecules in diagnostics and genomics research.
May the tribe of people like Dr. Sridhar increase, and may the culture of working across boundaries – spanning science, engineering, computer science, medicine, pharmaceuticals and more – remain open to the exchange of new ideas. Molecular separation technology stands at the frontier of scientific innovation, offering unparalleled opportunities to revolutionise industries ranging from healthcare and agriculture to energy and manufacturing. This cutting-edge methodology enables the precise isolation, purification, and manipulation of molecules, driving economic growth while addressing critical environmental and societal challenges.
Molecular separation technology represents a transformative force in the global economy, offering solutions that enhance efficiency, sustainability, and profitability across industries.The fear that AI will take away jobs is real. However, new jobs will also be created, and people will be employed in making things more efficient and affordable. That it is happening in India augurs well.
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Sridhar Sir’s work in membrane science is truly impressive—innovative, impactful, and always rooted in deep scientific understanding. But beyond his research, what stands out even more is the kind of person he is. He’s humble, thoughtful, and always generous with his time and support.
It’s rare to find someone who is not only a brilliant scientist but also such a genuinely good human being. I’ve always admired how grounded he remains despite his achievements.
A true asset to the scientific community and a wonderful person to know.
A truly inspiring piece, sir. Dr. Sridhar’s work is a powerful example of how scientific innovation, when guided by social responsibility, can create meaningful change. His commitment to providing affordable and sustainable water purification solutions for remote communities is truly commendable. This blog not only honors a pioneering individual but also celebrates a vision of science that is inclusive, practical, and deeply rooted in human values. It’s heartening to see the interdisciplinary applications of his work—bridging science, technology, and society for the greater good. May many more be inspired to follow in Dr. Sridhar’s path.
Dear Sir, I am deeply moved and inspired by this remarkable and insightful narrative, which blends personal conviction with national purpose. The decision to step beyond DRDO reflects a rare courage to serve the broader technological and societal ecosystem. Our beloved guide, Dr. Sridhar Sir’s journey, stands as a shining example of how deep scientific expertise, when aligned with social responsibility, can create a transformative impact, from access to clean water to cutting-edge membrane technologies. The emphasis on interdisciplinary collaboration and the future of molecular separation is both timely and visionary. Thank you for sharing such a powerful vision, which reminds us of the true purpose of science: to serve humanity and shape a sustainable future.
Dr. Sridhar: The Molecular Man of India Who Purifies More Than Just Water:
In a world full of innovators and achievers, few stand out not just for their intellect, but for their integrity, humility, and human touch. Dr. Sridhar, a distinguished scientist at the Indian Institute of Chemical Technology (IICT), Hyderabad, is one such extraordinary individual. Known for his groundbreaking work in molecular separations and water purification, he has earned accolades not only as a global scientist but also as a great human being and an inspiring sportsman.
A Trailblazer in Science and Innovation:
Dr. Sridhar’s contributions to science are not confined to academic papers or conference halls. His work has created real-world solutions that address some of the most pressing problems of our time — especially access to clean and safe drinking water. At a time when water scarcity and pollution pose serious health threats across the globe, his research in membrane technologies and molecular separation processes has provided hope, sustainability, and innovation.
With a portfolio that boasts numerous international publications and prestigious patents, Dr. Sridhar’s scientific impact is truly global. His technologies are applied across a spectrum of industries and environmental settings, making him a pillar of chemical and environmental innovation in India.
The Title That Says It All: “Molecular Man of India”:
It is rare for a scientist to earn a title that captures both their intellectual domain and their national significance. But when Dr. Arun Tiwari, the respected DRDO scientist and co-author with Dr. A.P.J. Abdul Kalam, calls Dr. Sridhar the “Molecular Man of India,” it resonates deeply.
This title is not merely symbolic — it reflects Dr. Sridhar’s mastery in manipulating molecules to develop technologies that transform lives. Whether it’s removing contaminants from water or designing processes for sustainable chemical production, his molecular magic is redefining scientific possibilities.
A Man of Wisdom, Warmth, and Willpower:
Beyond his accolades, Dr. Sridhar is known for his modesty, warmth, and deep sense of purpose. He believes that science must serve society, and he lives by this principle in every project he undertakes. Colleagues and students alike admire him not just for his genius but for his empathy, ethical leadership, and ability to inspire.
He is also a devoted mentor, shaping young minds to think innovatively while remaining grounded. I had an opportunity to work under him as scientist B at IICT, Hyderabad, and I have learned many things from him, both professional and personal developments. Though it was a short tenure, for me, it remains a lifetime experience. For those who have worked with him, Dr. Sridhar is more than a scientist — he is a guide, motivator, and role model.
A Sportsman with the Spirit of a Warrior:
Science isn’t the only field where Dr. Sridhar shines. A passionate sportsman, he brings the same level of discipline and determination to the field that he brings to the lab. Whether it’s cricket, badminton, or Table Tennis — his enthusiasm for sports reflects his belief in balance, health, and team spirit.
His sportsmanship also reflects his scientific philosophy: strategic thinking, consistent effort, and a relentless pursuit of excellence.
Legacy in the Making:
Dr. Sridhar’s journey is not just a personal story of success — it is a narrative of hope, innovation, and national pride. In him, we find a rare combination: the sharp mind of a scientist, the humble heart of a teacher, and the strong spirit of a sportsman.
At a time when the world seeks solutions for clean water, sustainable technologies, and scientific responsibility, India proudly looks to Dr. Sridhar, not only as a scientist but also as a symbol of what authentic leadership in science can embody.
Let us celebrate Dr. Sridhar Sir not only for the molecules he separates, but also for the communities he unites, the students he mentors, and the lives he continues to uplift every day.
Superb handout Dr Tiwari Ji. Hats off. Also, Dr Sridhar’s wonderful contributions have always been a blessing to man kind. Appreciate your hard work.
This blog is a masterpiece containing highly technical information which most people, including myself, may not be aware of. Your in-depth knowledge speaks about your vast studies… The concluding part is well-crafted.
Best Wishes.
Prof., Excellent contacts from various walks of life!
Exciting work being done by Mr Sridhar.
Very pleased to know.
What an inspiring journey—from building missiles to pioneering molecular separation! I loved how you connected deep scientific work with personal insight and spirituality. It’s rare to see such a powerful blend of innovation and inner reflection. The way you spoke about chance moments and a higher purpose really struck a chord. Thank you for sharing your story so openly—it truly motivates and uplifts.
Congratulations, Sridhar Sir! Dr. Arun Tiwari’s heartfelt blog beautifully celebrates your exceptional journey, highlighting your outstanding leadership, vision, and dedication to advancing science. Your pioneering work in molecular separation technologies, including electrodialysis, nanofiltration, and reverse osmosis, has had transformative impacts across industries. Over 70 water purification plants have been developed by you, improving access to clean water in underserved areas. Your contributions have earned you the title “Molecular Separation Man of India” and 75 prestigious awards. Beyond research, over 500 graduates have been mentored by you, contributing to interdisciplinary innovations and shaping future leaders in science and engineering.
Dear Sir, Thank you for sharing this informative blog.
Sridhar Sir, your dedication, innovation, and expertise you’ve shown in this critical field continue to pave the way for new scientific frontiers. Wishing you continued success as you drive impactful advancements in this area!
Thank you, Dr Arun Tiwari sir, for sharing this inspiring article. I had the privilege of knowing Dr. S. Sridhar Sir, not very closely, but enough to understand the depth of his commitment and passion. Reading about his work and dedication made me feel proud and inspired. He truly is a great scientist and a humble human being. His journey, as described here, is a perfect blend of scientific vision and national service.
Thank you for writing about such a noble person. My heartfelt respect goes to you and Sridhar, sir.
While significant advancements have been made in water filtration technologies, some gaps remain in terms of widespread accessibility, cost-effectiveness, and effectiveness against specific emerging contaminants. Although technologies like reverse osmosis, UV-C disinfection, and nanofiltration are effective, they may not be universally accessible or suitable for all water sources and user needs.
While some energy-efficient designs exist, there’s a need for more widespread adoption of systems that minimise energy consumption and water wastage, especially in regions with limited resources. Many remote and underserved communities lack access to clean and safe drinking water due to the high cost and complexity of existing filtration technologies.
Technologies need to catch up with the increasing number of emerging contaminants, such as pharmaceuticals, microplastics, and PFAS (per- and polyfluoroalkyl substances), which are not effectively removed by many conventional filters.
Molecular separation is the bedrock of biomedical engineering. Techniques like apheresis and dialysis use molecular separation to remove harmful substances from the blood, such as toxins or excess antibodies.
डॉ. श्रीधर को बधाई। जनस्वास्थ्य के दृष्टिकोण से, निस्पंदन और अन्य पृथक्करण तकनीकों का उपयोग अपशिष्ट जल से दवा संदूषकों को हटाने के लिए किया जाता है, जिससे सार्वजनिक स्वास्थ्य और पर्यावरण की रक्षा होती है। माइक्रोफिल्ट्रेशन और अल्ट्राफिल्ट्रेशन का उपयोग चिकित्सा उत्पादों और समाधानों से बैक्टीरिया और अन्य सूक्ष्मजीवों को हटाने के लिए किया जाता है, जिससे बाँझपन और सुरक्षा सुनिश्चित होती है। हालाँकि, यह बहुत उपकरण और इनका रखरखाव महंगे हैं।
Congratulations Arun Tiwari ji for your phenomenal achievements . Your contributions in the critical areas of defence and health care were game changers. I had a great experience, reading your blog.
Dr S Sridhar has had a very illustrious time during his schooling and college. His interest was both in academic’s & into Sports as observed in school & Hyderabad sports circles. and many have known him as a talented cricketer who has represented Hyderabad & South Zone, in the state & Zonal tournaments and plus the Osmania university in interversity tournaments.. His good form in Cricket was enviable. Apart from cricket, he has excelled in other sports of lawn tennis Table Tennis, badminton and chess. He is a wonderful athlete. loves playing games, in the spirit of sportsmanship..
The same passion he had in the game has continued to drive him as a scientist. He has immensely contributed to the upliftment of villages & in the space of providing safe drinking water to the people. He has installed 75 water purification system, which has benefited 5 million people.. He has created reorganised drinking water from relative humidity for regions of water scarcity which is a giant step, the field of science and technology. His accomplishments are by far invaluable. My best wishes to Dr. Sreedhar to continue the great work and for further innovations..
Hats off to Dr Sridhar. Molecular separation techniques play a crucial role in identifying biomarkers associated with diseases, such as cancer, infectious diseases, and neurological disorders. By analysing bodily fluids (such as blood and urine) for specific biomarkers, these techniques can enable early disease detection and diagnosis, thereby improving patient outcomes. Molecular separation can aid in monitoring disease progression and treatment effectiveness by tracking changes in biomarker levels over time. Thank you Sir.
Truly inspiring and beautifully written!
Dr. Sridhar’s journey is a shining example of how deep scientific expertise, when applied with purpose, can create real societal impact. From water purification to advanced membrane technologies, his contributions are both timely and transformative.
Thank you, Sir, for capturing this remarkable story so powerfully. It’s a testament to what innovation, mentorship, and dedication can achieve for our nation and the world.
I had the privilege of knowing Dr. Sridhar sir during my PhD at IICT, and I have always admired his dedication to science and innovation. His work in water purification using membranes has made a real difference. During the COVID-19 pandemic, Dr. Sridhar sir quickly developed a special mask, showing his ability to respond to urgent public needs. One of his most impressive contributions is “Megaduth” – a device that pulls clean drinking water from the air, which is a brilliant and much-needed solution.
Sridhar sir has visited our college and delivered a very insightful and inspiring talk. Many students and faculty, including myself, were deeply motivated by his words and achievements. He is not just a scientist but a true problem-solver and role model. I hope many young researchers follow in his footsteps.
“Dr. Sridhar, you’re a true trendsetter!! As a student, you shone brightly as a consistent performer and a shining star in academics. Now, you’re making significant strides in various fields of science, and your work is poised to flourish and impact lives in profound ways.
You’re a nice human ever willing to help and a source of constant support to those around you!
Your dedication, expertise, and innovative spirit are an inspiration to many. We celebrate your remarkable achievements and look forward to witnessing the continued impact of your work on the world. Congratulations on your outstanding contributions to science and technology!”
Well articulated blog!
Sir, it is truly inspiring and deeply motivating to learn about the remarkable work of Dr. Sridhar sir. The way you have enlightened his pioneering efforts in many fields is truly commendable.
In an era where innovation thrives on integration, sir’s work exemplifies what becomes possible when intellectual curiosity is driven by purpose and a commitment to societal progress. His dedication to environmental welfare, scientific advancement sets a powerful example for all of us.
Thank you sir for your continuous inspiration.
“Some minds don’t just solve problems—they create new ways of seeing.”
In a country that’s launching rockets and sequencing genomes, one quiet revolution has been steadily separating molecules to unite lives. This is the story of Dr. S. Sridhar, a man deeply rooted in chemistry, but whose vision reached far beyond laboratories., the man who didn’t just master molecular separation—he redefined its purpose in India.
From Lab Coats to Life Jackets
Born in Hyderabad to a Tamil family with army roots, Sridhar’s early life blended discipline with curiosity. He chose chemical engineering, but where most branched into careers, he dove deep into molecular separation—a field that few understand but everyone benefits from.
Since 1995, Sridhar has built a legacy at CSIR-IICT not just of research, but of transformational impact. He designed pilot-scale plants for gas purification, solvent recovery, and water filtration, introducing India to membrane technologies like electrodialysis, nanofiltration, and forward osmosis.
Science That Travels—To Villages and Beyond
In a world fixated on startups and billion-dollar valuations, Dr. Sridhar focused on something radical: clean water in remote villages. Over 70 custom water purification systems later, people in ten Indian states are drinking safe water—free from fluoride, microbes, and disease.
What’s more? These systems were built to be maintained by the villagers themselves. That’s the genius of Sridhar—not just inventing, but embedding self-reliance into science.
When a Pandemic Hit, He Didn’t Pause
During COVID-19, as the world struggled to breathe, Sridhar helped it breathe safer. He developed affordable, washable multilayered face masks and innovated a device to produce ultrapure medical-grade water, turning crisis into opportunity, and fear into fuel for innovation.
These efforts didn’t just save lives—they inspired entrepreneurs, led to new startups, and brought advanced science into everyday relevance.
A Career That Bridges Every Divide
Today, Sridhar is a pioneer in fuel cell membranes and gas separation, working to purify natural gas and recover valuable olefins for the petrochemical industry. His innovations help cut energy use, boost economic output, and support climate goals—a rare trifecta of industrial, national, and planetary benefit.
His work embodies a unique bridge—between academic rigor and industrial utility, deep research and everyday need, lab bench and village well.
The Global Science of Separation
Globally, molecular separation began with chromatography in Russia, grew with polymer science in the West, and now matures with AI, nanotech, and synthetic biology. Dr. Sridhar places India firmly in that global conversation—with homegrown tech for local and global challenges.
Whether it’s removing CO₂ from power plants, capturing hydrogen, or purifying biologics for medicine, molecular separation now shapes how we live, breathe, heal, and progress.
Beyond Molecules: A Movement
Dr. Sridhar has trained over 500 scientists and engineers, nurturing a generation that sees technology as a social mission. He isn’t just separating molecules—he’s connecting people, disciplines, and dreams.
It’s no wonder that he’s received 75+ prestigious awards. But the real prize is the impact he’s made—drop by drop, plant by plant, idea by idea.
The Future Flows Through Separation
Tomorrow’s technologies—quantum computing, gene editing, green hydrogen—all rely on precise separation at the molecular level. Dr. Sridhar’s journey is a preview of that future, showing how Indian science can lead with purpose, not just process.
Let us celebrate the man who turned molecular separation into a movement of inclusion, innovation, and integrity. Dr. S. Sridhar isn’t just the Molecular Separation Man of India. He’s the connective tissue between what science can do and what society needs.
Let’s remember:
He separates molecules—but connects lives.
He divides compounds—but multiplies impact.
He filters out problems—but pours in hope.
India needs more Sridhars.
The world needs more missions like his.
Dr. Sridhar sir, it’s indeed a lifetime achievement to be associated with Dr. Arun Tiwari ji, one of the world’s legendary personalities, who has had the opportunity to work under the guidance of the world’s most prominent missile expert and the legendary President of India. Furthermore, Dr. Sridhar, your outstanding work on membrane separation technologies and water purification has provided services with societal benefits. Sir, I heartily congratulate you on your untiring work and wish you many laurels.
Sir, the story of Dr Sridhar reminds me of a similar great work being done by my professor Dr Robin Dutta (Tezpur Central University) in North East India. He is doing silently lot of great work on water filtration in remote places of North East where water toxicity very high. His Facebook link is
https://www.facebook.com/share/16QqQd9ivJ/?mibextid=wwXIfr. I’ll connect you to him, will be a pleasure for you , I believe, Regards.
Thank you for sharing the inspirational story of Dr. S. Sridhar. ‘Molecular Separation Man of India’ is a truly fitting title for him.
Dear Sir, your achievements are truly astounding!!
I am especially inspired by the water purification plants and multi layered masks that helped people combat many diseases, not to mention the molecular separation technology with its diverse applications!!
A hearty congratulations on your innovative journey so far and many more to come!!
Truly inspiring & nice information
Really interesting to know so much about Dr. Sridhar and his contributions to Molecular Separation and his dedicated service to the society. He is the Man of simplicity with exemplary scientific insights combined with humanitarian values. I am feeling very proud and highly blessed to be associated with such a Great Human Being. Thank you Shri. Arun Tiwariji for this wonderful article. I am also totally inspired by your journey of innovations from DRDO to various places. Thank you.
Molecules are at the core of every living and non-living thing on Earth. Mastery over them is harnessing the forces of nature for human benefits. This kind of superpower could help in solving some of the toughest modern-day problems. One such issue is water contamination—like arsenic—something millions of people have to live with every single day.
In 2019, I was just a curious 8th grader who had the privilege of meeting Dr. Sridhar, the ‘Molecular Separation Man of India’. I visited his membrane separation laboratory at CSIR-IICT, Hyderabad, along with three other friends who were working on a novel arsenic filtration technology. Although I was not directly part of the project team, I worked closely with them.
Visiting Dr. Sridhar’s lab was one of the most inspiring moments of my life. Not just because it was my first time stepping into an actual research laboratory, but because the people working there were truly passionate and dedicated to understanding molecules to solve one of the most fundamental global problems—the availability of safe drinking water.
Dr. Sridhar himself is a visionary scientist who recognized the potential in us, even though we were just school students, and has guided us ever since. One moment I remember clearly is on the very last day at IICT. We were discussing plastics and their impact on the environment. He said that there is no doubt that plastic is not very environmentally friendly. But now we are dependent on it—it is everywhere—we cannot escape it. What we should focus on is finding scientific solutions to mitigate its bad impacts.
That moment deeply inspired me. It helped shape my passion for science and instilled in me a belief: solutions to the toughest problems are always possible, all we need is dedication to figure them out—and scientific research is the way to do so.
Dear Arun Sir, Thank you very much for sharing this thoughtful and inspiring blog post. It’s a truly insightful piece that offers valuable perspectives and motivates early-stage researchers like us. As a student of CSIR-IICT, I have always drawn immense inspiration from Dr. Sridhar Sir’s remarkable presence. Beyond his exceptional contributions to the field of separation science, his consistently supportive nature and deeply rooted scientific temperament continue to guide and encourage us. This write-up was truly enlightening, offering a glimpse into the visionary contributions of distinguished stalwarts like Dr. Sridhar Sir, whose work continues to shape and inspire the scientific community.
Sir, your blog is very inspiring and impressive. The way you have highlighted the journey and contributions of Dr. Sridhar is truly commendable. His dedication to molecular separation technology and societal welfare is motivating for researchers and readers.
Dr. Sridhar Sir is not only a brilliant scientist but also a wonderful human being who always helped and encouraged me in my research work. I am deeply grateful to Sir for his constant support and kindness. Your positive impact on the scientific community and individuals like me will always be truly appreciable and remarkable. Thank you, Sir, for your guidance and generosity.
Sridhar Sir, thank you for your outstanding contributions to research and academia. As a research scholar, I have been deeply inspired by your dedication to molecular separation and membrane technology, which has not only advanced scientific knowledge but also brought practical solutions to society. One of your presentation at IIT Guwhati regarding clean water from moist air had really thrilled us.
Your commitment to innovation and excellence motivates students like me to pursue research with passion and integrity. Thank you sir, for being a guiding light and for your invaluable contributions that continue to shape the future of science and technology in India. Your work truly makes a difference!
This blog beautifully articulates why Dr. S. Sridhar Sir is such a pivotal figure in molecular separation. His ability to bridge the gap between complex scientific research and its diverse applications across industries—from healthcare to petrochemicals—is a masterclass in interdisciplinary thinking. It’s a powerful reminder of how vital cross-functional collaboration is for progress.
It’s also truly inspiring to read this piece from the Prof. Arun Tiwari Sir, whose own journey, starting with a “leap of faith” from DRDO and mentored by Dr. Kalam Ji, clearly demonstrates a lifelong commitment to fostering innovation and connecting scientific advancements with real-world societal needs. The insights shared here highlight a deep understanding of the challenges and triumphs in bringing advanced technology to the forefront.
Dear Arun Sir,
Thank you very much for sharing this powerful and deeply inspiring blog. It beautifully captures the essence of Dr. Sridhar Sir’s extraordinary contributions and unwavering dedication to societal betterment.
I had the privilege of pursuing my PhD under the esteemed guidance of Dr. Sridhar Sir. Witnessing his passion for rural development and his tireless efforts to ensure safe and pure drinking water for the common man left a lasting impact on me. His mentorship not only strengthened our scientific thinking and problem-solving abilities but also taught us how to approach challenges with clarity and purpose.
The time I spent under his guidance was truly the most enriching phase of my research journey. His encouragement extended beyond the laboratory — he actively inspired us to pursue a healthy work-life balance and motivated me personally to take up lawn tennis and other sports activities. His holistic approach to life and work has left an indelible mark on all of us.
Dr. Sridhar Sir is truly a man with a Midas touch, transforming every initiative he touches into something meaningful and impactful. This blog serves as a much-needed inspiration for the younger generation, showcasing how science, service, and simplicity can coexist in one extraordinary individual.
We, the current young researchers of the Research and Development Lab at Bihar Bal Bhawan Kilkari, have closely witnessed the progress and development of the arsenic removal project during our working days in the lab. While Arpit Bhaiya has now graduated and moved on, the rest of us continue to contribute actively to this meaningful initiative.
Though direct external support was limited during our initial phases, the recognition and certification from CSIR-IICT & Dr S Sridhar mentioned in the blog reflect the scientific credibility our collective efforts have achieved. We take pride in being part of this impactful journey aimed at providing sustainable solutions to arsenic contamination in groundwater, a pressing issue in Bihar.
We remain committed to advancing research and innovation under the Bihar Education Department’s banner and are motivated to contribute further to the well-being of our communities.
— On behalf of the Young Researchers Team
Research and Development Lab
Bihar Bal Bhawan Kilkari
Section of Bihar Education Department
Great presentation to read and understand the technology. Membranes and its sciences are wonderful to read more and more every time. My professor my guide Dr Sridhar is inspiration and made me to see other side of membrane technologies. Thanks a alot for this presentation, well written and shown more possible ways to work.
Truly inspiring! Dr. Sridhar sir pioneering work in molecular separation shows how science can solve real-world problems — from clean drinking water to sustainable industrial processes. Innovation with impact!
A great example of how interdisciplinary research and collaboration can shape a better, more sustainable future. Let’s celebrate the minds working behind the scenes to make life healthier, safer, and more efficient.
As a student who has been fortunate to be mentored in the field of molecular separation, I can wholeheartedly say that working under a visionary like Dr. Sridhar has been nothing short of transformative. Beyond the technical brilliance, what I gained the most was the art of real world problem solving— applying deep scientific knowledge to create accessible, affordable, and scalable solutions that truly impact society. His passion for interdisciplinary collaboration and his drive to translate research into tangible outcomes has deeply influenced the way I approach my own work. Learning under his guidance didn’t just make me a better researcher; it shaped me into a more responsible and purpose-driven scientist. I hope many more students get to experience this level of mentorship and inspiration
Dr. S. Sridhar’s perspective really stands out. The idea that every purification method is unique and must be tailored to efficiently and reliably filter out the root cause, while also being affordable is both practical and deeply relevant. What resonates most is his emphasis that local people must be able to maintain these plants themselves. That kind of thinking doesn’t just solve technical problems, it creates lasting, community-driven change.
Having him as a mentor and guide throughout our development journey has been truly inspiring and something we’re genuinely grateful for.
Accounts Officer & In-Charge, Arsenic Project
Bihar Bal Bhawan Kilkari, Department of Education, Government of Bihar
As the current Accounts Officer and In-Charge of the Arsenic Project at Bihar Bal Bhawan Kilkari, I am honored to be part of this inspiring initiative. Although I joined the project after the initial phases, I have witnessed the exceptional progress made by our young researchers, including the successful demonstration and certification of the device by the prestigious CSIR-IICT under the guidance of Dr. S. Sridhar.
The recognition from such a renowned institute and the mentorship of Dr. Sridhar truly reflect the innovative spirit and dedication of the team. Being part of their journey towards providing affordable and effective solutions for arsenic contamination in groundwater fills me with great pride.
I look forward to supporting the continued growth and impact of this critical project for the people of Bihar.
— Shri Vinay Mishra
Accounts Officer & Project In-Charge
Bihar Bal Bhawan Kilkari
Department of Education, Government of Bihar
As a lead in Environmental & Regulatory Affairs at Navmarg Research & Innovations Pvt. Ltd., and a postgraduate student at TERI School of Advanced Studies, I have had the opportunity to closely contribute to the arsenic removal project from both scientific and regulatory angles. My background in water science, groundwater studies, and environmental assessment allows me to approach our challenge holistically, focusing on sustainable solutions for heavy metal contamination.
While I was not involved in the initial discovery phase, my role has been integral in advancing the research, bridging lab investigations with grassroots community engagement, and driving regulatory pathways to facilitate commercialization. The mentorship and support from Dr. S. Sridhar and CSIR-IICT have been invaluable, reinforcing the scientific credibility and potential impact of our work.
I am proud to collaborate with a multidisciplinary team dedicated to delivering innovative, scalable solutions to address water contamination challenges faced by rural communities in Bihar and beyond.
— Akshat Adarsh
Lead – Environmental & Regulatory Affairs, Navmarg Research & Innovations Pvt. Ltd.
Postgraduate Student, TERI School of Advanced Studies
As a proud member of the arsenic removal project team, I have been deeply inspired by the incredible journey of our innovation from a school-level idea to a promising solution with social impact. Although I did not have the opportunity to experience the early stages firsthand, I have closely witnessed the dedication, perseverance, and scientific rigor demonstrated by my teammates.
Being an undergraduate in Computer and Communication Engineering at Manipal Institute of Technology and an affiliated researcher at Bihar Bal Bhawan Kilkari, I have contributed to the project through technical implementation and strategic planning, ensuring that our solutions are not only scientifically sound but also scalable and impactful for communities in Bihar.
The mentorship and support from CSIR-IICT, especially Dr. S. Sridhar, have been vital in shaping the direction and validation of our work. I am honored to be part of this multidisciplinary effort and remain committed to leveraging my expertise in data analytics and visualization to drive meaningful change.
— Shambhavi Sinha
Computer and Communication Engineering Undergraduate, Manipal Institute of Technology
Affiliated Researcher, Bihar Bal Bhawan Kilkari
A Note from Jyoti Parihar, Director, Bihar Bal Bhawan Kilkari
At Bihar Bal Bhawan Kilkari, our mission has always been to unlock the creative potential of children from diverse and often underprivileged backgrounds across Bihar. Having worked extensively for over 15 years in supporting children and women—understanding their unique challenges and aspirations—I have seen firsthand how meaningful mentorship and scientific innovation can change lives.
One such inspiring journey is that of Arpit Kumar and his team, whose early curiosity in science led them to explore arsenic removal using magnetic molecular separation. Their humble school project evolved into a promising social innovation that could address a critical public health issue in Bihar.
The guidance and encouragement from Dr. S. Sridhar of CSIR-IICT have been invaluable to these young innovators. Dr. Sridhar’s willingness to support, refine, and certify their work—despite their youth and humble beginnings—has played a pivotal role in transforming their vision into actionable solutions. This kind of support is exactly what our children need: experienced mentors who believe in their potential and guide them with patience and expertise.
It fills me with pride that children of Bal Bhawan benefiting from such high-caliber scientific mentorship. Their success stories reaffirm why we at Kilkari strive every day to create enabling environments where children can dream big and achieve even bigger.
We look forward to continuing this journey of nurturing talent and facilitating collaborations that empower our youth to become changemakers for Bihar and beyond.
— Jyoti Parihar
Phenomenal indeed—the molecular man of India! My story is also closely linked with Sridhar Sir. When I was in high school, I was working on an arsenic removal project for a science competition. No one imagined that a small school project could turn into a social invention, but that’s exactly what happened. We successfully cracked the idea of physically separating molecules using the magnetic behavior of arsenic.
Soon after, to validate our findings, we contacted many CSIR laboratories. The most rapid and supportive response came from CSIR-IICT. I remain grateful to Dr. S. Chandrashekar, then Director of IICT, for his prompt encouragement. Alongside him, Dr. S. Sridhar from the same institute quickly connected with us. Dr. Sridhar caught on immediately and said, “Yes, yes, you can come. We will work, refine, and certify everything.” We were amazed—after all, we were just kids in class 9 and 10 presenting this idea!
Along with his friend and Principal Scientist Dr. Ramanuj Ranjan, currently Director of CSIR-IMMT and also from Bihar, they provided tremendous support. Dr. Sridhar has been the backbone of our journey. Whenever we felt stuck, we contacted him.
Recently, on 22nd April, I met him in Hyderabad. I shared with him that we are moving toward commercialization through our startup but facing fabrication challenges. He encouraged us, saying, “Okay, okay, try through our SME contacts.” He also introduced me to his new PhD/MSc student, who is from Patna. Haha, we respect him deeply and hope his blessings will continue.
An excellent introduction to a fantastic work by a great scientist. Please draw attention to the ponds and lakes in our villages, which are vulnerable to various pollutants, including bacteria, viruses, and harmful levels of certain chemicals. Even wells are not safe. Large-scale filtration is difficult and costly. Additionally, there are issues of sedimentation and algal blooms that can affect water quality and necessitate specialised filtration methods. Effective filtration of lake water to drinking water standards may require advanced and expensive technologies. I wish corporations would adopt ponds and lakes as part of their corporate social responsibility (CSR) initiatives and utilise indigenous technology developed by Dr Sridhar and his team. Everything can not be left to the government and bureaucracy. Those who are rich must come forward to solve some problems of the poor.
Thank you, sir, for sharing this deeply insightful and inspiring reflection. Your journey from defence technology to biomedical innovation exemplifies how science can be harnessed for human welfare. The spotlight on Dr. Sridhar’s remarkable contributions to molecular separation is both timely and necessary. His work not only embodies scientific excellence but also delivers real-world impact, bringing clean water, environmental solutions, and healthcare innovation to underserved regions.
What stands out is the spirit of interdisciplinary collaboration you champion—a value that is increasingly essential in solving complex global challenges. The parallels drawn between molecular separation and its potential biomedical applications, including plasmapheresis for cholesterol management, offer a powerful glimpse into how Indian science can shape the future of sustainable and affordable healthcare.
May this narrative continue to inspire young scientists to think beyond silos, and may visionaries like you and Dr. Sridhar continue to lead the way in translating science into service. Truly, a salute to the synergy of knowledge, compassion, and national spirit. Warm Regards,
Mr. Arun Ji, your blog article on the ‘Molecular Man of India’ is nothing short of enlightening. You’ve beautifully translated complex scientific achievements into an engaging narrative for all to appreciate.
Great account of contributions in various areas contributing to sustainable solutions to the issues of relevance and use. Thanks for the great narrative and contribution of this great scientist.
Fantastic Sri, it’s such a privilege to be in the same group as the ‘Molecular Separation Man of India and I mean it from the bottom of my heart. As with all ironies in life, those closest to us are the last to know of our most outstanding achievements. And though we know you as a dedicated professional, a star in the science field, i could only appreciate the full gravity of your contribution thanks to this detailed blog from such an eminent personality as Dr Tiwari. Forgive us for taking you for granted, but also remember that we love what you do, who you are, and are immensely proud of what you accomplish (despite our limited knowledge of your achievements). Wishing you many, many more laurels, awards and achievements, our very own molecular separation man (funnily, there’s not a single thing about you which separates, you have the energy that unites). Much love, Sri, and all the best in the future.
It was great to read about Dr S.Sridhar achieving so much in such a short time – Proud of U, my buddy! Regards
Nice information
Dear Arun Tiwari Sir, Thank you very much for sharing your journey with Dr A.P.J. Abdul Kalam, sir. Your insights were truly enlightening. Additionally, your reflections on the research achievements and Societal welfare contributions of Dr. S. Sridhar Sir are very inspirational to all.
Dear sir, it is really heart touching to see your blog about Dr. Sridhar. His uncompromised quality consciousness with ethics and teamwork kept me in right path during my research work. I feel honoured to be associated with a person like him during my life.
Dear Arun Tiwari Ji, Kudos to Dr. Sridhar for his incredible contributions to science! His humble beginnings and passion for achievement are truly inspiring. He’s made a real impact on scientific knowledge, industrial development, and society. His legacy is a motivation for aspiring scientists. Thanks for sharing his amazing story!
Few writers can balance scientific rigor with readability, as you have, Arun Ji. This blog post stands out as both informative and inspiring. Thank you, sir.
Dear Tiwari Sir, your enthusiasm and gratitude truly demonstrate how much innovative scientists are valued and admired. Their contributions to science and technology have undoubtedly had a big impact, whether they are in the areas of missile development, membrane separation technology or any other. My colleague, Dr. Sridhar’s work has been effectively conveyed. In addition to spurring innovation, Dr. Sridhar’s work on Membrane Technology has had a profoundly positive impact on people’s lives. It’s encouraging to see how science can close the gap between research and the good of society by giving those in need access to clean water and encouraging environmentally friendly practices.
Thanks a lot, Sir.
Dear Tiwari Sir, your passion and appreciation are a true reflection of how deeply groundbreaking scientists are respected and admired. Their contributions to science and technology, whether in the fields of missile development or membrane separation technology, have surely had a significant influence. The work of my colleague, Dr. Sridhar has been well captured. The impact of Dr. Sridhar’s work is truly remarkable—his contributions to Membrane Technology have not only driven innovation but have also improved lives in the most fundamental ways. It’s inspiring to see how science can bridge the gap between research and societal benefit, providing clean water to those in need and fostering sustainable solutions for industry. Thanks a lot, Sir.
“Arun Tiwari Ji and Dr. Sridhar are total legends! Their innovative work is making waves globally. Dr. Sridhar’s molecular separation tech is a total game-changer – we’re blown away by their brilliance!
Respected sir,
Your ability to interweave biography, science, and technology into a single post is truly inspiring and made it a thoroughly engaging and enriching read. Thank you for sharing this blog. It is indeed a motivating start to this week.
Inter-disciplinary efforts have invariably become success stories all over. A look at the Nobel Prizes over the years in areas of Physiology & Medicine, Chemistry and even in Physics will reveal the very strong tenor of interdisciplinarity. The success of Dr Sridhar is a continuing reminder of the importance of cutting across your primary discipline. Thanks Dr Tiwari for your excellent blogs.
“वाह! अरुण तिवारी जी और डॉ. श्रीधर की मेहनत और जुनून देखकर दिल खुश हो जाता है! डॉ. श्रीधर का आणविक पृथक्करण में काम स्वास्थ्य और उद्योगों के लिए वरदान साबित हो रहा है। हमें उन पर गर्व है! “
Great narration as always by the exemplary Dr Arun Tiwari Ji. Your blogs have been providing inspiration to millions of youngsters. You are a catalysing medium for bringing out many unsung tales of scientists who have been serving the society. Dr Sridhar’s story from his modest beginning’s to his current position would help many youngsters.
Mr. Arun Ji, your blog is a testament to how powerful words can preserve the legacy of great minds. Thank you for sharing such valuable insights. I enjoyed this blogpost thoroughly
Thank you, Sir, for sharing this inspiring and deeply insightful post. As a proud Ph.D. student of Dr. S. Sridhar, I’m truly inspired by this powerful tribute. It beautifully captures his pioneering work in molecular separation and his rare ability to bridge scientific excellence with real-world impact. His dedication to societal innovation continues to guide and motivate researchers like me. Grateful to be part of his legacy.
A powerful piece by Arun Tiwari ji, highlighting Dr. Sridhar sir’s inspiring journey in molecular separation. A true meeting of minds — innovation with impact!
Dear Arun Sir, Thank you so very much for the blog.
It’s an extraordinary journey of Dr. Sridhar Sir from research assistant to an eminent scientist in developing novel membranes for molecular separations. Dr. Sridhar Sir’s work played a pivotal role in developing cost-effective and sustainable technologies that benefit both industry and society. Several people in remote areas affected by waterborne diseases now have access to safe drinking water. Hats off for the significant contributions to science and technology. It’s truly inspiring and motivational.
Sir, your blog is very impressive and motivating your work in molecular separation showcases the power of innovation driven by purpose. And your dedication to developing indigenous solutions not only strengthens India’s scientific capabilities but also addresses critical real world challenges. A great tribute to a true pioneer in Indian science and technology.
Being a dissertation student under Dr. Sridhar sir at CSIR-IICT has been a great learning experience. It’s amazing to see how his research isn’t just limited to the lab but actually makes a real difference in people’s lives. From clean water to medical tech, his work shows how science can be both smart and meaningful. I’m glad to be part of this journey and learn from someone so passionate and grounded.
What a truly remarkable and humbling tribute to Dr. Sridhar’s Sir’s visionary contributions! As someone fortunate enough to work under his mentorship, I have witnessed firsthand the dedication, intellect, and compassion he brings to every innovation and interaction. His work in molecular separation is not just scientifically profound, but deeply rooted in societal relevance from providing clean drinking water in remote villages to advancing medical and environmental technologies.
Sir’s rare ability to bridge deep scientific expertise with real-world applications continues to inspire generations of researchers like myself. This write-up captures not only his achievements but also the spirit of collaboration and interdisciplinary innovation that he embodies. It is a privilege to be part of his journey and to learn from a true pioneer our very own “Molecular Separation Man of India.”
May his story continue to ignite curiosity and purpose in every aspiring scientist.
Dear Sir, your working journey with DRDO and developing a first titanium air bottle for AKASH missile airframes is very impressive. The over all journey of yours with Dr. Kalam was found to be very fascinating and inspiring for young minds who wish to perceive research in the filed of air crafts and missiles. I am very much overwhelmed to see a blog on Dr. Sridhar, my mentor and guide. Dr. Sridhar’s journey in the field of Membrane Technology has been thoroughly documented, and he stands as a compelling example of innovation serving both industrial advancement and societal benefit. Thank you once again for sharing the inspiring work of Dr Sridhar and team.
Truly inspiring and motivating!
A fitting reflection on where each of us needs to be, if tomorrow is to bring joy to our spheres of existence! We laud the great contribution Dr Sridhar is making !!
Dear Sir, I thoroughly enjoyed reading the article—it was exceptionally well written. I genuinely admire the deep and meaningful work being done by Dr. Sridhar, and only an accomplished scientist like you could have captured and presented his contributions with such clarity and insight. It’s fantastic to see such cutting-edge work happening in India.
Dear Arun ji
Thank you very much for this blog .
A powerful and deeply inspiring read.
Arun ji you have beautifully captured the essence of purpose-driven science through Dr. Sridhar’s journey.
As someone from the medical field, I am particularly moved by the way molecular separation technologies are being harnessed to impact lives—from clean water to affordable diagnostics. This is the kind of interdisciplinary innovation that India needs—grounded in compassion, driven by excellence.
Salutations to both the chronicler and the changemaker.
May your tribe increase!!
Sir, very rightly said – May the tribe of people like Dr. Sridhar increase, and may the culture of working across boundaries – spanning science, engineering, computer science, medicine, pharmaceuticals and more – remain open to the exchange of new ideas. Thank you for sharing these inspiring stories with us, offering such great insight.
Dear Dr. Tiwari ji, your words offer a profound tribute to Dr. S. Sridhar, showcasing his groundbreaking contributions to molecular separation technology and its wide-ranging societal impact. From water purification and membrane innovation to biomedical applications and energy sustainability, the narrative highlights how interdisciplinary collaboration can transform lives. This is not only honouring scientific excellence but also inspires future innovators to work across domains. As usual, you always celebrate India’s growing scientific and leadership in technological advancement, echoing Dr. Kalam’s legacy of innovation with purpose. Many many thanks for this beautiful contribution.
Well captured Arun Ji
Superb description of a great scientist. I a country like India and so many similar ones where people are genetically pre-programmed to have cardiac diseases the concept of plasmapheresis may be a game changer. Also we keep on hearing about cheap and easy technologies to obtain clean drinking water in remote areas but such technologies probably remain in labs or pilot stage only. We work in remote tribal areas of Arunachal Pradesh where water borne diseases are a major public health threat but on ground nothing has changed.
Wow, what an amazing story of landing real impact with technical innovations and advances. Hats off to Dr Sridhar and likes of him for their contributions to humanity, the value of which, we may never be able to measure.
Dear Professor, Thank you for sharing Dr. Shridhar’s inspiring work. Indeed, molecular separation offers a significant opportunity to address global challenges across various spectrums—healthcare, the petrochemical industry, and others—best wishes to Dr Shridhar and his Team in their work.
Oh, it’s so great to find a place and appear in your blog, that too with finely articulated words—Bhai Sahab TUSSY GREAT HO. Dr. S. Sridhar is one of my dearest friends; I love him deeply. My words fall short in trying to praise these paragraphs further. SADAR CHARAN SPARSH.
Dear Prof Tiwari Ji, your journey from DRDO to promoting innovation in many fields, inspired by Dr. Kalam, is truly impressive. Dr. Sridhar’s outstanding work in molecular separation, including setting up over 70 water purification plants and creating low-cost medical devices, shows his talent and deep commitment to society. His rare combination of deep scientific knowledge and practical impact, along with guiding 46 students and winning 75 major awards, makes him rightly known as a ‘Molecular Scientist’. The way this technology has grown, as you explained, shows its power to change industries. Dr. Sridhar’s work sets a great example of sustainable development. Wishing continued success to such cross-disciplinary efforts!
Arunji, A story of visionary science and unwavering commitment, Dr. Sridhar’s pioneering work in molecular separation not only advances technology but touches lives across sectors—from clean water to healthcare. A true example of innovation for social good. May more such interdisciplinary champions emerge.