Process for precipitating heavy metals from wastewater

Patent · Tue Oct 19 00:00:00 EDT 1982

OSTI ID:6945715

Hallberg, R O

A process is given for precipitating heavy metals from wastewater containing sulfate ions by treatment of the water with sulfate-reducing bacteria. Said bacteria will reduce the sulfate ions to hydrogen sulfide which in its turn will precipitate the metal ions in the form of metal sulfides. According to the invention the bacteria are cultured in one or more culturing vessels in the presence of a nutritive solution and a portion of the wastewater, and the resulting aqueous solution containing hydrogen sulfide produced by the bacteria is introduced into a precipitation vessel together with the remaining major portion of the wastewater.

• Assignee: Vyr-Metoder Ab (Sweden)
• Patent Number(s): US 4354937
• OSTI ID: 6945715
• Resource Relation: Patent Priority Date: Priority date 24 Apr 1979, Sweden; Other Information: PAT-APPL-220058
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
SULFATES
PRECIPITATION
REDUCTION
WASTE WATER
WASTE PROCESSING
BACTERIA
COPPER SULFATES
CULTURE MEDIA
HYDROGEN SULFIDES
IRON SULFATES
METALS
PH VALUE
ZINC SULFATES
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER COMPOUNDS
ELEMENTS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
LIQUID WASTES
MANAGEMENT
MICROORGANISMS
OXYGEN COMPOUNDS
PROCESSING
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTES
WATER
ZINC COMPOUNDS
420900* - Engineering- Waste Processing Plants & Equipment- (-1989)
320604 - Energy Conservation
Consumption
& Utilization- Municipalities & Community Systems- Municipal Waste Management- (1980-)