Method and apparatus for drying sewage sludge with a drying gas

Details Method and apparatus for drying sewage sludge with a drying gas Method and apparatus for drying sewage sludge with a drying gas

1993-10-21

1995-07-04

Bennet, Henry A.

Drying and gas or vapor contact with solids

Apparatus

Houses, kilns, and containers

34224, 34475, C02F 1112, F26B 2500, B01D 5326

Patent

active

054289041

ABSTRACT:
Moist sewage sludge is dried in a sludge dryer having several zones. The initial moisture content of the sewage sludge may range up to 80% by weight, while the dried bulk material shall have a remainder moisture content of about 5% by weight. The drying gas temperature is maintained at a level up to 50.degree. C. to avoid activating additives that may be present in the sludge in the form of harmful substances to avoid the entry of these substances into the atmosphere. Furthere, the escape of processing air that has a noxious odor is avoided by passing the air through a deodorizer. The drying gas itself is reconditioned by reducing its moisture in a separate gas drying circuit from which the dried gas is again returned as a drying gas into the sludge dryer. A gas drying agent, such as a hygroscopic material is used in the gas dryer and the gas drying agent itself is regenerated by withdrawing moisture therefrom in a regenerating circuit.

REFERENCES:
patent: 3314159 (1967-04-01), Betz
patent: 3470708 (1969-10-01), Weil et al.
patent: 3488971 (1970-01-01), Meckler
patent: 3705461 (1972-12-01), Parkes
patent: 3844737 (1974-10-01), Macriss et al.
patent: 4253825 (1981-03-01), Fasano
patent: 4509272 (1985-04-01), Graff
patent: 4653199 (1987-03-01), McLeod et al.
patent: 5038498 (1991-08-01), Woolsey
patent: 5144754 (1992-09-01), Persson
Chemical Engineering, Aug. 15, 1988 "The Key to Driving Solids" by Paul Y. McCormick pp. 113 to 122.

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