Process for the biological treatment of waste water

Details Process for the biological treatment of waste water Process for the biological treatment of waste water

1985-03-01

1986-04-15

Castel, Benoit

Liquid purification or separation

Processes

Treatment by living organism

210616, 210625, 210627, C02F 302

Patent

active

045826072

ABSTRACT:
A method is disclosed for the biological aerobic purification of waste waters wherein a temperature from 30.degree. to 60.degree. C. is maintained in a first process stage and a temperature from 20.degree. to 40.degree. C. is maintained in a second process stage, with the temperature in the first process stage always being higher than the temperature in the second process stage and wherein a part of the activated sludge of the second process stage, after being seperated, is returned to the first process stage. The process provides a high decomposition output and produces an activated sludge which exhibits good sedimentation behavior.

REFERENCES:
patent: 2190598 (1940-02-01), Fischer
patent: 3337448 (1967-08-01), Rich
patent: 3926794 (1975-12-01), Vahldieck
patent: 3977966 (1976-08-01), Pradt et al.
patent: 4246009 (1981-01-01), Gould et al.
patent: 4276174 (1981-06-01), Breider et al.
patent: 4340484 (1982-07-01), Pollock et al.
Scheffler et al., Tech. Mitt. Krupp Forsch.-Ber. [Technical Reports from Krupp Research], vol. 40, No. 1, 1982, pp. 13-18.
G. Renz, Wasser, Luft and Betrieb [Water, Air and Operation], vol. 22, No. 10, 1978, pp. 535-539.
Eisenacher et al., Umwelt und Technik [Environment and Engineering], 81, pp. 6-10.

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