Heavy metals removal

Details Heavy metals removal Heavy metals removal

1995-12-11

1997-07-29

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210710, 210725, 210727, 210734, 210908, 210911, 210912, 405129, 588256, 588257, C02F 156

Patent

active

056518951

ABSTRACT:
The present invention in one embodiment, is a process that uses a chemical treatment to remove heavy metals from wastewater; heavy metals from wastewater containing oxygenated hydrocarbons; and arsenic, organic acids, and heavy metals from antifreeze solutions. In one aspect such a method includes adding an iron salt, to an antifreeze solution containing arsenic and heavy metals with adequate mixing for dispersion throughout the solution. Then, a base is added to increase the pH to a level from about 8 to 10. As the base is added, a precipitate with contaminates forms and is then removed by standard filtration techniques. The arsenic, organic acids, and heavy metals co-precipitate with the iron and are removed by filtration. The process may either be a batch process or a continuous process. In one aspect the wastewater is generated by a process according to the present invention for purifying contaminated soil or sediment.

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