Arsenic present in groundwater can be partially removed
along with removal of iron by precipitation/coagulation method if iron is also present in the water
on boiling even if iron is absent in the water
on UV-treatment
on filtration even if iron is absent in the water
Answer is Right!
Answer is Wrong!
This question was previously asked in
UPSC CAPF – 2013
One effective method for removing arsenic from water is co-precipitation or adsorption onto iron oxyhydroxides. When iron is present in the water, or is added as a coagulant (like ferric chloride), iron precipitates are formed. Arsenic species (arsenite and arsenate) adsorb onto the surface of these precipitates or are incorporated into the growing iron particles. Subsequent sedimentation and filtration of these iron precipitates effectively remove arsenic from the water.