Biological wastewater treating system

Patent · Tue Mar 15 04:00:00 EST 1988

OSTI ID:5139992

Chen, M S.K.; Spector, M L

This patent describes a method for operating an activated sludge system to produce a non-bulking sludge having rapid settling characteristics and containing an activated biomass species capable of removing phosphate values which comprises: (a) forming a mixed liquor in a BOD sorption zone, the mixed liquor being formed by mixing an activated biomass with a soluble BOD/sub 5/ containing wastewater influent under conditions such that at least 25% of the soluble BOD/sub 5/ is sorbed by the biomass; (b) oxidizing the BOD/sub 5/ in the mixed liquor, including at least part of the BOD/sub 5/ sorbed in the biomass; in an oxidation zone by contacting the mixed liquor with an oxidizing agent; (c) settling the resulting oxidized mixed liquor in a settling zone thereby forming a supernatent liquor and a dense sludge containing activated biomass; and (d) recycling at least a portion of the dense sludge to the BOD sorption zone. The improvement comprises: incorporating oxidizing agent into the oxidation zone at a rate not substantially exceeding the rate of oxidation.

• Assignee: Air Products and Chemicals, Inc., Allentown, PA
• Patent Number(s): US 4731185
• OSTI ID: 5139992
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320604* -- Energy Conservation
Consumption
& Utilization-- Municipalities & Community Systems-- Municipal Waste Management-- (1980-)
ACTIVATED SLUDGE PROCESS
CHEMICAL EFFLUENTS
CHEMICAL REACTIONS
HYDROGEN COMPOUNDS
INDUSTRIAL PLANTS
LIQUID WASTES
MANAGEMENT
OXIDATION
OXIDIZERS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PROCESSING
REMOVAL
SEWAGE
SORPTION
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PROCESSING PLANTS
WASTE WATER
WASTES
WATER
WATER TREATMENT
WATER TREATMENT PLANTS