Process for dewatering sewage sludge

Details Process for dewatering sewage sludge Process for dewatering sewage sludge

1976-03-23

1977-07-26

Spear, Jr., Frank A.

Liquid purification or separation

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

Responsive to fluid flow

210 18, 210 59, 71 12, 71 28, 71 63, C02C 300

Patent

active

040381811

ABSTRACT:
A process for dewatering sewage sludge having a water content on the order of 75% to 95% and previously untreated for the release of such water. The sludge is mixed with a chemical selected from the group consisting of urea and the common ammonium and potassium salts in relative quantities which produce a desired degree of phase separation. The hygroscopic qualities of the chemical operate to remove water from the sludge to form a separate liquid phase of the chemical dissolved in water removed from the sludge, and a solid or semi-solid phase of the sludge solids with any remaining water. The phases may then easily be separated with great simplification of subsequent handling, disposal or further processing of each.

REFERENCES:
patent: 2300693 (1942-11-01), Oswald
patent: 3794582 (1974-02-01), Lackme et al.

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