Method for purification of phosphate-containing sewage

Details Method for purification of phosphate-containing sewage Method for purification of phosphate-containing sewage

1987-12-30

1989-12-05

Wyse, Tom

Liquid purification or separation

Processes

Treatment by living organism

210625, 210630, 210906, C02F 330

Patent

active

048850934

ABSTRACT:
For improvement of the phosphate redissolution taking place under anaerobic conditions, the treatment is conducted under anaerobic conditions, preferably in a settling tank, into which unsettled raw sewage and a return sludge from the secondary settling tank are introduced. The sludge retention time of the return sludge is generally over 5 hours, preferably 10-24 hours. In any case, the sludge detection time exceeds the hydraulic detection time.
The new process can be performed by using most existing plants with relative small investment expenditures and provides a phosphorus elimination on the order of magnitude of 90%.

REFERENCES:
patent: Re32429 (1987-06-01), Spector
patent: 3654147 (1972-04-01), Levin et al.
patent: 4141822 (1979-02-01), Levin et al.
patent: 4488968 (1984-12-01), Hong et al.
patent: 4650585 (1987-03-01), Hong et al.
Krichten, D. J., Hong, S. N., Tracy, K. D., Applied Biological Phosphorus Removal by the A/O Process, Internat. Conf. "Phosphorus in the Environment," Lisbon, Jul. 1985.
Ekama, G. A., Marais, G. R., Additional Biological P Elimination in the Activated Sludge Process--Experiences in South Africa, GWF 126, pp. 214 to 249 (1985) (no translation).
Levin, G. V., Topol, G. J., Tarnay, A. G., Operation of Full Scale Biological Phosphorus Removal Plant, JWPCF 47, 577-590 (1975).

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