A method to remove
arsenic in
underwater by preoxidation-combined electrolyzing relates to a method to remove
arsenic from
underwater, belonging to the technical field of
water treatment. The present invention has solved the defect that more expensive pure nulvalent iron and slower
corrosion speed of the pure nulvalent iron have limited the absorption of
arsenic on the nulvalent iron. The present invention includes the following steps: the
underwater containing arsenic is pre-oxidized by
ozone,
potassium ferrate,
potassium permanganate, H2O2,
photocatalysis oxidation
reagent or
Fenton reagent, thereby transferring As(III) to As(V). The water pre-oxidized passes through a filtering
bed containing cast-iron
scrap and carbon granules. The oxidizer left in the preoxidation section promotes the reaction of the step.