04671882 is referenced by 55 patents and cites 21 patents.

A process for producing a non-hazardous sludge from an aqueous solution which contains heavy metals comprising the steps of: (a) adding phosphoric acid or an acid phosphate salt to the aqueous solution to precipitate the heavy metals; (b) lowering the pH of the solution to less than about 5.0; (c) adding a coagulant to the solution; (d) raising the pH of the solution to above about 7.0 by the addition of a calcium source; and (e) dewatering the resulting non-hazardous sludge.

Title
Phosphoric acid/lime hazardous waste detoxification treatment process
Application Number
528031
Publication Number
4671882
Application Date
October 28, 1985
Publication Date
June 9, 1987
Inventor
Ralph D Grotelueschen
East Moline
IL, US
Paul F Kusy
Coal Valley
IL, US
Gary R Douglas
Waterloo
IA, US
Agent
Burns Doane Swecker & Mathis
Assignee
Deere & Company
IL, US
IPC
C02F 1/56
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