Process of dewatering sewage sludge

Details Process of dewatering sewage sludge Process of dewatering sewage sludge

1976-01-09

1977-07-26

Spear, Jr., Frank A.

Liquid purification or separation

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

Responsive to fluid flow

210 51, 210 68, 71 12, C02C 300

Patent

active

040381803

ABSTRACT:
Sludge from a municipal or industrial sewage treatment facility is mixed with a mineral acid or anhydride thereof to release the entrapped water in the sludge. The remaining mixture of sludge solids and diluted acid or anhydride is then mixed with a basic material, such as ammonia, the heat generated by reaction of the base and acid evaporates the water to form either a completely dry mixture of sludge solids and a salt, or a mixture having a predetermined moisture content which may be air dried. In some applications it is preferable to recycle a portion of the end product by adding it to the reaction vessel.

REFERENCES:
patent: 3050383 (1962-08-01), Wilson
patent: 3527592 (1970-09-01), McPherson et al.
patent: 3676100 (1972-07-01), Gerhardt et al.
patent: 3758287 (1973-09-01), Scheel
patent: 3772191 (1973-11-01), Thorn
JIEC, vol. 13, No. 5, May 1921, pp. 406-410, Wilson et al.

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