Removal of heavy metals from waste streams
A method for removing heavy metals from effluent water is described comprising performing sequentially the following steps: (a) adding from 7-333 ppm of an anionic surfactant to the effluent water to provide coagulatable heavy metal ion; (b) adjusting the effluent water pH to within the range of 8 to 10, (c) providing from 10-200 ppm of a cationic coagulant to coagulate the heavy metal ion, (d) providing from 0.3 to 5.0 ppm of a polymeric flocculant whereby a heavy metal containing floc is formed for removal from the effluent water, and, (e) then removing the floc from the effluent water, wherein the anionic surfactant is sodium lauryl ether sulfate. The cationic coagulant is selected from the group consisting of diallyl dimethylammonium chloride polymer, epichlorohydrin dimethylamine polymer, ethylene amine polymer, polyaluminum chloride, and alum; and the flocculant is an acrylamide/sodium acrylate copolymer having an RSV greater than 23.
- Assignee:
- Nalco Chemical Co., Naperville, IL
- Patent Number(s):
- US 4758353
- OSTI ID:
- 6803309
- Resource Relation:
- Patent File Date: Filed date 19 Jul 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
WASTE WATER
DEMETALLIZATION
ACRYLAMIDE
ACRYLATES
ALUMINIUM CHLORIDES
AMINES
AMMONIUM CHLORIDES
ANIONS
COPOLYMERS
FLOCCULATION
PH VALUE
POLYMERS
REMOVAL
SODIUM SULFATES
SULFATES
SURFACTANTS
WASTE PROCESSING
WATER POLLUTION CONTROL
WATER TREATMENT
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
AMIDES
AMMONIUM COMPOUNDS
AMMONIUM HALIDES
CARBOXYLIC ACID SALTS
CHARGED PARTICLES
CHLORIDES
CHLORINE COMPOUNDS
CONTROL
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
IONS
LIQUID WASTES
MANAGEMENT
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLLUTION CONTROL
PRECIPITATION
PROCESSING
SEPARATION PROCESSES
SODIUM COMPOUNDS
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTES
WATER
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
320604 - Energy Conservation
Consumption
& Utilization- Municipalities & Community Systems- Municipal Waste Management- (1980-)
520200 - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)