Method for concentrating/dehydrating of sewage sludge

Details Method for concentrating/dehydrating of sewage sludge Method for concentrating/dehydrating of sewage sludge

1989-08-11

1990-09-11

Wyse, Tom

Liquid purification or separation

Processes

Treatment by living organism

210610, 210623, 210631, 210726, C02F 1114

Patent

active

049560921

ABSTRACT:
In the method for concentrating/dehydrating sewage sludge including activated sludge with the aid of organic polyelectrolytes and/or inorganic flocculators the activated sludge portion is produced in an aerated biologic clearing step in presence of--based on the amount of liquid flowing into the clearing step--5 to 0.01 parts by weight per million parts by weight of at least one compound selected from the group consisting of folic acid, dihydrofolic acid and at least an ammonium alkali metal salt, alkaline earth metal salt and alkanolammonium salt thereof.

REFERENCES:
patent: 3300401 (1967-01-01), Sontheimer
patent: 4132638 (1979-01-01), Carlsson
patent: 4377486 (1983-03-01), Barrick et al.
patent: 4521515 (1985-06-01), Hata

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