Arsenic present in groundwater can be partially removed

by

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
This question was previously asked in
UPSC CAPF – 2013
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The correct option is A. 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.
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.
Other methods for arsenic removal include adsorption onto activated alumina, iron oxides, or activated carbon, ion exchange, and membrane filtration (reverse osmosis). Boiling (B), UV treatment (C), or simple filtration without precipitation (D) are not effective methods for removing dissolved arsenic from water.

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