Selenate removal from waste water
An efficient process for removing oxyanions of selenium by selenate-respiring microorganisms may be obtained according to the invention by reducing the nitrate concentration well below 1 mM. In the process according to the invention, the required lowering of the nitrate concentration in selenium- and nitrate- containing waste water may be accomplished by employing a nitrate utilizing biomass under aerobic conditions in a first treatment zone to remove nitrate. The efficiency of the process is further enhanced by seeding the treatment zone where the microbial respiratory removal of oxyanions of selenium from waste water takes place with a culture of microorganisms enriched for selenium respiring microorganisms. Additional improvement of the process according to the invention may be obtained by adapting the seed culture of microorganisms enriched for selenium respiring microorganisms to the chemical conditions.
- Research Organization:
- Forest Service, Washington, DC (USA)
- Assignee:
- Forest Service, Washington, DC (US)
- Patent Number(s):
- A US 7-428699
- OSTI ID:
- 6969174
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AEROBIC CONDITIONS
ANIONS
BACTERIA
BIODEGRADATION
CHARGED PARTICLES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
HYDROGEN COMPOUNDS
IONS
LIQUID WASTES
MICROORGANISMS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
PH VALUE
SALINITY
SELENIUM
SEMIMETALS
WASTE WATER
WASTES
WATER