Polypure, Inc.

Frederick J Good, Jr

Ronald E Highsmith

Francis Stephen Lupton

Kenneth P Kehrer

Glenn E Petrie

Water soluble terpolymers based on (1) an acrylamide or acrylamide derivative, (2) a cationic vinyl monomer and (3) a hydrophilic vinyl monomer of the formula CH.sub.2 C(R)C(O)O(CH.sub.2 (CH.sub.2).sub.m O).sub.n E where R and E are each hydrogen or alkyl, m is an integer from 1 to 3 and n is an integer from 1 to 25 are useful flocculants.

Method of flocculation with cationic terpolymer flocculants

The present invention provides an improved biological sludge dewatering process. The process comprises the steps of: (a) heating biological sludge to a temperature of about 90.degree. to about 150.degree. C. which corresponds to a pressure of about 0 to about 55 psig and retaining the biological sludge at that temperature for less than about 15 minutes; (b) centrifuging the heated biological sludge to isolate the solids of the heated biological sludge from the liquid of the heated biological sludge; (c) chemically conditioning the isolated solids; and (d) dewatering the conditioned solids to produce a high solids biological sludge. The present process is used for dewatering any biological sludge to produce a high solids cake. The resulting high solids cake may be used as landfill, incinerated, or used as fertilizer by spreading on land and plowing said fertilizer into the soil.

Growing community of inventors

Camillus, NY, United States of America

Frederick J Good, Jr