In a breakthrough study published in *Water Resources and Industry*, researchers from the ICMR National Institute for Research in Environmental Health (ICMR-NIREH) in Bhopal, India, have uncovered a low-cost, high-efficiency method to remove the antibiotic ciprofloxacin (CIP) from wastewater using biochar derived from soya stalks—a common agricultural waste product. Lead author Bablu Alawa and his team found that simply heating soya stalks to 900°C produces a biochar capable of removing up to 98% of CIP from water, without the need for chemical activation.
The study highlights how such a straightforward thermochemical process could transform agricultural residues into a powerful adsorbent, addressing two pressing global challenges: antibiotic pollution in water systems and the disposal of farm waste. Burning agricultural residues like soya stalks is a common but environmentally harmful practice, contributing to air pollution and carbon emissions. This research offers a sustainable alternative—turning waste into a resource while mitigating pollution.
“What excites us is not just the high removal efficiency, but the fact that this biochar performs consistently even in the presence of other contaminants,” said Alawa. “Whether it’s nitrate, alkalinity, or organic carbon, the adsorption capacity remains robust—between 94% and 98%. That’s a game-changer for real-world wastewater treatment.”
The findings also challenge conventional assumptions about adsorption mechanisms. While agitation speed and mixing methods are often critical in treatment systems, the team observed no significant difference in performance when using different agitation techniques with their biochar. This suggests the material is inherently efficient and adaptable, potentially simplifying the design and operation of water treatment systems.
From a commercial perspective, the implications are substantial. For energy and water utilities, this presents an opportunity to integrate low-cost, bio-based adsorbents into existing treatment processes. The use of soya stalk biochar could reduce reliance on energy-intensive activated carbon and synthetic adsorbents, lowering operational costs and carbon footprints. Moreover, for regions with significant agricultural activity—such as parts of India, Brazil, or the U.S.—this could create a new revenue stream by valorizing farm waste.
The research also aligns with global sustainability goals, contributing to targets under SDG 3 (Good Health and Well-being) by reducing antibiotic contamination in water, and SDG 6 (Clean Water and Sanitation) through scalable, eco-friendly treatment solutions.
As antibiotic resistance continues to rise, innovative and accessible solutions like this one are urgently needed. While further studies are required to assess long-term performance and scalability, this work signals a promising direction—one where waste becomes a tool, and pollution is not just managed, but repurposed.