Sewage sludge additive

Details Sewage sludge additive Sewage sludge additive

1976-01-28

1980-06-24

Castel, Benoit

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

252422, C02B 114

Patent

active

042093937

ABSTRACT:
In a raw sewage treatment process of the type where settling tanks are used for the purpose of permitting the suspended matter in the raw sewage to be settled as well as to permit adsorption of the dissolved contaminants in the water of the sewage. The sludge, which settles down to the bottom of the settling tank is extracted, pyrolyzed and activated to form activated carbon and ash which is mixed with the sewage prior to its introduction into the settling tank, for the purposes mentioned. Because the sludge does not provide all of the activated carbon and ash required for adequate treatment of the raw sewage, it is necessary to add carbon to the process. In accordance with this invention, instead of expensive commercial carbon, coal is used to provide the carbon supplement.

REFERENCES:
patent: 1915240 (1933-06-01), Putnam
patent: 3244621 (1966-04-01), Bouthilet
patent: 3424676 (1969-01-01), Johnson et al.
patent: 3763040 (1973-10-01), Timpe et al.
patent: 3767570 (1973-10-01), Clapp
patent: 3887461 (1975-06-01), Nickerson et al.
patent: 3892661 (1975-07-01), Siviour et al.
patent: 3948791 (1976-04-01), Tominaga et al.

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