Method for drying and sterilizing sewage sludge

Details Method for drying and sterilizing sewage sludge Method for drying and sterilizing sewage sludge

1979-11-21

1981-06-02

Camby, John J.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 12, 210609, F26B 300, F26B 700

Patent

active

042702798

ABSTRACT:
An inexpensive method for drying and sterilizing sewage sludge that has previously gone through a preliminary drying process and has, on the average, a solid matter content ranging between 15 and 35% and a maximum content of 40%. The sewage sludge is dried and sterilized by breaking it into ball-like particles having diameters ranging from 1 to 10 mm and coating these particles with quicklime. The entire process can be performed using a paddle mixture. The quicklime not only reacts with the surfaces of the particles so coated but also penetrates into their interiors. The resulting chemical reaction (H.sub.2 O+CaO T Ca(OH).sub.2) dries and sterilizes the sludge, without the necessity of applying heat from an external source, directly to produce a granular product which, for example, can be used as an agricultural fertilizer which can be scattered by a conventional fertilizer spreader.

REFERENCES:
patent: 2723954 (1955-11-01), Young
patent: 3793841 (1974-02-01), Dozsa

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