Treatment of wastewater containing phosphorus compounds

Patent · Tue Dec 18 00:00:00 EST 1984

OSTI ID:5861592

Block, Ch S; Hong, S -H

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
• Resource Relation: Patent File Date: Filed date 7 Mar 1983; Other Information: PAT-APPL-472452
• Country of Publication: United States
• Language: English

Related Subjects

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