Liquid purification or separation – Processes – Treatment by living organism
Patent
1989-08-02
1992-07-07
Silverman, Stanley S.
Liquid purification or separation
Processes
Treatment by living organism
210627, 210625, 210630, C02F 330
Patent
active
051280400
ABSTRACT:
A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater containing suspended solids and biodegradable organic substances through an aerobic biological oxidation zone and therein oxidizing a portion of the BOD and converting a portion of the BOD into additional suspended solids; passing the effluent from said aerobic biological oxidation zone to an aerobic/mixing zone and therein mixing said effluent with effluent from the anoxic/anaerobic zone; passing the effluent from said aerobic/mixing zone to a settling zone and therein separating purified wastewater having reduced BOD and suspended solids, and sludge containing suspended solids; passing a portion of the sludge formed in the settling zone to an anoxic/anaerobic zone and therein increasing the extracellular polymer content of said sludge; and recycling an effective amount of the effluent from said anoxic/anaerobic zone to said aerobic/mixing zone.
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Molof Alan H.
Yun Zuwhan
Polytechnic University
Silverman Stanley S.
Upton Christopher
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