Question

Heavy metals like Ni can be separated from water by

• A. Carbomethyl enitosan
• B. Biological treatment
• C. Ultrafiltration
• D. Sedimentation

Answer 1

The correct option is B Biological treatment

Heavy metals present in the waste water are the major concern of the environmental pollution. Different methods that can be used for the removal of heavy metals are biosorption, using microorganisms, biofilter, activated sludge treatment etc. In biological treatment, microorganism under anaerobic conditions acts like biosorption which absorbs heavy metal by the transfer of ions from solution phase to cellular phase and removes the metallic waste from water.