System for removing phosphorus from waste water

Details System for removing phosphorus from waste water System for removing phosphorus from waste water

C - Chemistry, Metallurgy

02

F

C02F 1/58 (2006.01) C02F 1/52 (2006.01) C02F 1/72 (2006.01) C02F 3/28 (2006.01) C02F 3/30 (2006.01) C02F 9/14 (2006.01)

Patent

CA 2339695

Phosphate-contaminated water passes through a domestic sewage treatment system, in which oxidation of the ammonium progresses far enough to cause a lowering of the pH to 5 or less. The water is passed over sand grains coated with aluminum hydroxide (gibbsite). Enough Al3+ ions enter solution, at the low pH, to cause all the phosphate-P to precipitate as aluminum phosphate, and nothing else precipitates other than the aluminum phosphate.

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