Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1991-08-05
1992-11-03
Silverman, Stanley S.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210724, 210726, 210727, 210912, 210913, 423 55, 423 37, 423140, C02F 162, C02F 164
Patent
active
051606313
ABSTRACT:
A process for removing at least a portion of any iron, copper, nickel and chromium ions that are chelated by a alkylenepolyamine polyacetic acid or salt in an aqueous liquid waste. The process comprises the steps of (a) adjusting the pH of the liquid to above about 10; (b) adding sufficient sodium sulfide to react with at least a portion of the copper ions; (c) separating precipitated iron and copper compounds; (d) adding nitric acid to adjust the pH to the range of about 6 to 8; (e) adding sufficient sodium nitrite to the liquid to react with at least a portion of the nickel and chromium present; (f) heating the liquid to above about 575.degree. F. for at least about 15 minutes to facilitate precipitation of nickel and chromium; and (g) separating precipitated solids to leave a non-hazardous filtrate.
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Frost Jack G.
Snyder Kenneth J.
Halliburton Company
Kent Robert A.
McCarthy Neil M.
Silverman Stanley S.
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