Process for treating wastewater containing fat and heavy metal i

Details Process for treating wastewater containing fat and heavy metal i Process for treating wastewater containing fat and heavy metal i

1981-11-09

1984-07-31

Wyse, Thomas G.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210716, 210724, 210912, C02F 162

Patent

active

044629133

ABSTRACT:
Heavy metal pollutant ions and emulsified fat are removed from a wastewater stream in a two-stage process. The first stage involves the demulsification and removal of fat through the use of chemical emulsion breakers leaving residual fat in suspension and in solution. The second stage involves the preparation and introduction of a calcium sulfide mixture to the wastewater resulting in the precipitation of the heavy metal ions as sulfides and the precipitation of residual fat.

REFERENCES:
patent: 3740331 (1973-06-01), Anderson et al.
patent: 3956117 (1976-05-01), Bradley et al.
patent: 4005009 (1977-01-01), Kinoshita et al.
patent: 4102784 (1978-07-01), Schlauch
patent: 4278539 (1981-07-01), Santhanam et al.
patent: 4329224 (1982-05-01), Kim
Kim, B. M.-"Treatment of Metal Containing Wastewater by Sulfide Precipitation", Nov. 16-20, 1980, See p. 8-Am. Inst. of Chem. Engineers Meeting.
Kemmer, F., Editor, NALCO Water Handbook, Chapter 8, (Coagulation and Flocculation)-McGraw-Hill, 1979.
Kemmer, F., Editor, NALCO Water Handbook, Chapter 11 (Emulsion Breaking)-McGraw-Hill, 1979.
Robinson, A. K. & Sum, J. C.-Sulfide Precipition of Heavy Metals-Research Report, (1979), U. S. Env. Prot. Agency.
Robinson, A. K., "Sulfide vs. Hydroxide Precipitation of Heavy Metals from Indus. Wastewater." EPA Report, Nov. 1978.

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