Continuous treatment of chromium bearing waste water

Details Continuous treatment of chromium bearing waste water Continuous treatment of chromium bearing waste water

1991-10-07

1993-10-26

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210913, 210757, 423 55, 423607, C02F 162

Patent

active

052563065

ABSTRACT:
The present invention provides a composition and process for the treatment of waste water containing chromium compound, for example water from a plating operation which includes significant concentration of a toxic chromium compound such as chromic acid. The chromium bearing solution is mixed with sufficient amount of hydrazine which can include selected minor concentrations of a cobalt salt to react with the chromium compound and render it insoluble. The chromium bearing water is introduced to a vessel which can have a baffle so that water introduced on one side of the baffle flows along a side of, then under the baffle and overflows on the other side. The hydrazine, which can include cobalt salt, is introduced to the incoming water at a rate to control the pH of the effluent from the vessel at a selected value of pH sufficient to remove all chromium from the effluent.

REFERENCES:
patent: 3537896 (1970-11-01), Nohse et al.
patent: 4268486 (1981-05-01), Noack et al.
patent: 4367213 (1983-01-01), Fiorucci et al.

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