Liquid purification or separation – Processes – Treatment by living organism
Patent
1983-07-12
1988-03-15
Castel, Benoit
Liquid purification or separation
Processes
Treatment by living organism
210614, 210903, 210906, C02F 330
Patent
active
047311851
ABSTRACT:
A modified activated sludge system is provided wherein wastewater containing BOD.sub.5 and phosphate values is admixed in an initial zone with biomass-containing recycled sludge to form a mixed liquor under conditions effecting sorption of BOD.sub.5 in the biomass. Subsequently, said mixed liquor is subjected to aeration in an oxidation zone under conditions for effecting oxidation of BOD.sub.5, such that oxidizing agent is incorporated into the oxidation zone at a rate not substantially exceeding the rate of oxidation. By such operation, considerable savings in power requirements for oxygen transfer to the mixed liquid are had, while developing and maintaining a dense non-bulking biomass having the properties of good removal of phosphate from the wastewater influent.
REFERENCES:
patent: 3864246 (1975-02-01), Casey
patent: 4056465 (1977-11-01), Spector
patent: 4162153 (1979-07-01), Spector
patent: 4271026 (1981-06-01), Chen
"Process Design Manual for Upgrading Existing Wastewater Treatment Plants"--U.S. Environmental Protection Agency Technology Transfer.
Chen Michael S. K.
Spector Marshall L.
Air Products and Chemicals Inc.
Castel Benoit
Marsh William F.
Rodgers Mark L.
Simmons James C.
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