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Treatment of wastewater containing phosphorus compounds

Patent ·
OSTI ID:5861592
;
Wastewater containing phosphorus values and BOD is initially admixed with recycled sludge containing activated biomass under anaerobic conditions, then contacted with oxygen-containing gas, followed by separation of a dense sludge layer from the mixed liquor. A portion of the sludge layer, containing the activated biomass, is held under non-aeration conditions for sufficient time to reduce any nitrates and/or nitrites contained therein, before admixture of the recycled sludge with the wastewater influent.
Assignee:
Air Products and Chemicals, Inc.
Patent Number(s):
US 4488967
OSTI ID:
5861592
Country of Publication:
United States
Language:
English

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Related Subjects

520200* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ANAEROBIC DIGESTION
BIOCHEMICAL OXYGEN DEMAND
BIOCONVERSION
BIOMASS
DIGESTION
ELEMENTS
ENERGY SOURCES
ENVIRONMENTAL QUALITY
HYDROGEN COMPOUNDS
IMPURITIES
LIQUID WASTES
MANAGEMENT
NITRATES
NITRIDES
NITROGEN COMPOUNDS
NONMETALS
OXYGEN COMPOUNDS
PHOSPHORUS
PNICTIDES
POLLUTION ABATEMENT
PROCESSING
PURIFICATION
RECYCLING
REMOVAL
RENEWABLE ENERGY SOURCES
SEPARATION PROCESSES
SLUDGES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
WATER POLLUTION ABATEMENT
WATER QUALITY
WATER TREATMENT