Oxidative method of purifying highly contaminated waste water

Details Oxidative method of purifying highly contaminated waste water Oxidative method of purifying highly contaminated waste water

C - Chemistry, Metallurgy

02

F

C02F 1/72 (2006.01) C02F 1/46 (2006.01) C02F 1/467 (2006.01) C02F 1/70 (2006.01) C02F 3/02 (2006.01) C02F 3/12 (2006.01) C02F 9/00 (2006.01) C02F 11/00 (2006.01)

Patent

CA 2159198

A process to purify waste waters using chemical oxidation and Fenton's reagent by the action in the acid range of hydrogen peroxide and iron(II) compounds and subsequent precipitation in the weakly acid to alkaline range of the iron(III) compounds, said process being characterized in that the sludge containing iron(III) accumulating besides the purified waste water is re- reduced chemically or electrochemically to iron(II) compounds and in that the sludge so reduced is fed back into the process. The process of the invention allows extensive purification of highly contaminated waste waters and furthermore problems arising with the treatment and elimination of the Fenton sludge can be circumvented.

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