Liquid purification or separation – Processes – Treatment by living organism
Patent
1988-03-28
1991-05-28
Wyse, Tom
Liquid purification or separation
Processes
Treatment by living organism
210614, 210630, 210903, C02F 330
Patent
active
050192663
ABSTRACT:
Aerobic purification of waste water with intermittent batchwise supply of waste water to the activated sludge tank from which the treated waste water drains continuously is disclosed, in which the nitrate content in the waste water is simultaneously reduced by throttling the aeration of the activated sludge tank, starting with the admission of the waste water to the tank, to values equivalent to less than or equal to 0.5 mg/l dissolved oxygen. In particular, aeration may be off until such time as the nitrate content in the tank has dropped below 5 mg/l, in particular below 1 mg/l. In the case of urban waste waters a cycle time of about 1 hour is expediently employed under these circumstances and the aeration is shut off for about 5 minutes, starting from the rapid admission of the waste water charge. Preferably, inlet charges are less than or equal to 30%, in particular between about 5% and 20%, of the tank capacity. In this procedure, nitrate present is degraded in the phase involving oxygen throttling, while in the subsequent phase (over longer times) ammonium fed in with the waste water supplied is converted into nitrate, provision being made for a sufficient population of nitrifying bacteria in the tank.
REFERENCES:
patent: 4437992 (1984-03-01), Saito et al.
patent: 4705633 (1987-11-01), Bogusch
patent: 4772396 (1988-09-01), Voyt
patent: 4793930 (1988-12-01), Soeder et al.
R. Kayser, et al., Wasser und Boden 5 (1982) 186-193, "Simultane Stickstoffelimination--Beitrag zur praktischen Anwendung auf Klaranlagen" (Simultaneous Nitrogen Removal--Practical Application to Water Purification Plants).
Groeneweg Joost
Keusen Heiner
Raphael Thomas
Soeder Carl-Johannes
Zanders Erich
Forschungszentrum Juelich GmbH
Wyse Tom
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