Liquid purification or separation – Processes – Treatment by living organism
Patent
1992-05-28
1993-09-28
Wyse, Thomas
Liquid purification or separation
Processes
Treatment by living organism
210619, 210626, 210903, 210906, C02F 308
Patent
active
052484220
ABSTRACT:
A BOD-containing wastewater also containing unacceptable levels of phosphorous, nitrogen or mixtures thereof is introduced into and mixed with recycled activated sludge in a first aeration zone including at least one partially submerged rotatable biological contactor under conditions whereby the overall dissolved oxygen content of the mixed liquor in the first aeration zone is about 0.7 to about 1.5 mg/l so as to cause microorganisms capable of storing phosphates under oxidizing conditions to release soluble phosphates into the mixed liquor, the mixed liquor from the first aeration zone is transferred to a subsequent aeration zone and aerated under conditions whereby the overall dissolved oxygen content of the mixed liquor is greater than about 1.5 mg/l so as to cause storing of phosphates by phosphate-storing microorganisms, the mixed liquor from the subsequent aeration zone is transferred to a settling zone wherein a clarified supernatant liquid is separated from settled sludge containing phosphate-storing phosphate-storing microorganisms, at least a portion of the settled sludge is recycled to first aeration to provide the desired amount of suspended solids. A portion of the phosphorous-rich solids is wasted to maintain the phosphate content in the clarified effluent below a predetermined level.
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patent: 4093539 (1978-06-01), Guarino
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patent: 4663044 (1987-05-01), Goronszy
patent: 4721570 (1988-01-01), Ankaitis
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