Chrome removal waste treatment process

Details Chrome removal waste treatment process Chrome removal waste treatment process

1978-11-15

1981-04-07

Wyse, Thomas G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210913, 210724, C02F 170

Patent

active

042604915

ABSTRACT:
A process is disclosed for the removal of chrome from waste water containing chrome in addition to at least one chelating agent for trivalent chromium. The chrome-containing waste water is treated at low pH with both a reducing agent suitable for converting hexavalent chrome to trivalent chrome and with a ferric or aluminum sulfate or chloride salt. Following the reduction step, the pH of the now acidic solution is raised, using an inorganic base, to a pH sufficient to cause the formation of chromic hydroxide. The process of this invention is particularly suitable where rapid sedimentation processes, such as are achievable by the use of the lamella separator, are contemplated.

REFERENCES:
patent: 3575853 (1971-04-01), Gaughan et al.
patent: 3956121 (1976-05-01), Haschke et al.
patent: 4005009 (1977-01-01), Kinoshita et al.
Hoover et al., "Disposal of Waste Liquors from Chromium Plating," Ind. and Eng. Chem., vol. 33, No. 1, Jan. 1941, pp. 131-134.

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