Treatment method for removing arsenic from arsenic contaminated

Details Treatment method for removing arsenic from arsenic contaminated Treatment method for removing arsenic from arsenic contaminated

1994-02-08

1994-10-25

Nessler, Cynthia L.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210721, 210722, 210724, 210725, 210726, 210727, 210743, 210746, 210911, C02F 152, C02F 158

Patent

active

053586433

ABSTRACT:
A treatment method for removing arsenic from water includes conditioning the water with one more additives including an iron salt, an acid, and an oxidant until the water contains more ion than arsenic, is acidic, and has an ORP of about plus 600 mV. A reagent is then added to the conditioned water until it becomes basic and the water and additives are then reacted in a reaction chamber wherein iron and arsenic are co-precipitated in the form of iron arsenate and iron hydroxide or iron oxide. Treated water is then separated from the precipitate by settling of filtering.

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patent: 5093007 (1992-03-01), Domuile
patent: 5114592 (1992-05-01), Schuster
patent: 5137640 (1992-08-01), Poncha
"The Detoxification of Effluents Containing Arsenic" EPD Congress '90, Teixeira et al., The Minerals, Metals & Materials Society 1990 pp. 198-207.
"Field Evaluation of Arsenic and Selenium Removal by Iron Coprecipitation", Merrill et al., Environmental Progress 6, 2, 82-90 May 1987.
"Arsenic (III) Oxidation & Removal from Drinking Water", Frank & Clifford, R & D Apr. 1986.

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