Method of treating liquid wastes containing heavy metal chelate

Details Method of treating liquid wastes containing heavy metal chelate Method of treating liquid wastes containing heavy metal chelate

1987-06-22

1989-02-07

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210727, 210734, 210912, 423 34, C02F 156

Patent

active

048029939

ABSTRACT:
A method of treating liquid wastes containing heavy metal chelate compounds which comprises reducing the pH of liquid wastes containing the heavey metal chelate compounds to 4 or less, adding iron polysulfate or at least one heavy metal ion selected from a source of Fe.sup.++, Fe.sup.+++, Cu.sup.++, Ni.sup.++ and Zn.sup.++ other than the iron polysulfate to form an iron chelate compound, then forming a solution containing Ca.sup.++ ions at pH 9 or more, and flocculating to precipitate thereby separating the resulting heavy metal hydroxides. The method gives a high heavy metal and COD removal rates, as well as showing good separability for flocks upon flocculating treatment.

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Chemical Abstracts vol. 82, No. 4, 1-27-75, p. 316, 21429e.
Chemical Abstracts vol. 89, No. 4, 7-24-78, p. 377, 30387m.
Chemical Abstracts, vol. 87, No. 18, 10-31-77, p. 296, 140824t.

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