Blue-Green Algae Can Remove Lead from Water
Scientists at IIT Guwahati developed a cyanobacteria (blue-green algae) biomaterial using exopolysaccharides (EPS) to remove lead from contaminated water. Cyanobacteria occur in ponds, lakes, reservoirs, paddy fields and slow-moving freshwater bodies. Sticky, sugar-rich EPS naturally binds lead; algae adjust EPS composition to trap particles, achieving 66.2% lead removal. Conventional methods (precipitation, membrane filtration, ion exchange) are costly, energy-intensive and polluting. Cyanobacteria also form cyanolichens, enrich soil and fix nitrogen as biofertiliser.
The Hindu


