Method for removal of heavy metals from water

Details Method for removal of heavy metals from water Method for removal of heavy metals from water

1998-06-11

2000-11-28

Cintins, Ivars

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210726, 210912, 210914, C02F 152

Patent

active

061531081

ABSTRACT:
A method to remove heavy metals concentrations in water down to very low levels is described. The method calls for the addition of a soluble sulfide to the water. This is followed adding a soluble iron reagent such as ferrous sulfate or ferrous chloride. The water is aerated. As an alternative to aeration, the pH of the water can be increased. Finally, the solids generated from the above steps are separated from the water. This method has been shown to remove heavy metals, particularly copper and zinc, from actual industrial wastewater to very low concentrations, i.e., below about 100 ppb. Furthermore, the treated water is free of sulfide. The byproduct sludge comprises iron sulfide, iron oxides, iron hydroxides, and the heavy metal sulfides.

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Reynolds, T.D., Unit Operations And Processes In Enviromental Engineering, pp. 23-28, (1982).

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