Method for preventing activated sludge from losing its settling

Details Method for preventing activated sludge from losing its settling Method for preventing activated sludge from losing its settling

1994-10-21

1996-07-16

Hruskoci, Peter A.

Liquid purification or separation

Processes

Treatment by living organism

210631, 210728, 210729, 210734, C02F 150, C02F 312

Patent

active

055364101

ABSTRACT:
A method for preventing activated sludge from losing its settling ability, which sometimes happens in solid/liquid separation in an activated sludge treatment of an aqueous organic waste and causes the so-called bulking and scumming of the sludge. This method involves adding either (a) a nonionic and/or an anionic surfactant, (b) a combination of a nonionic surfactant with a cationic surfactant of a form of quaternary ammonium salt or (c) a combination of a nonionic surfactant and a cationic surfactant of a form of a quaternary ammonium salt with a cationic organic flocculant, to the activated sludge treatment system.

REFERENCES:
patent: 3259570 (1966-07-01), Priesing et al.
patent: 4341632 (1982-07-01), Gregor et al.
patent: 4675114 (1987-06-01), Zagynai et al.
patent: 4710298 (1987-12-01), Noda et al.
patent: 4732684 (1988-03-01), Fujino
patent: 4956092 (1990-09-01), Blum
patent: 5006639 (1991-04-01), Tono et al.
patent: 5308499 (1994-05-01), Dixon et al.

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