Use of very high charge cationic polymers in biological sludge dewatering
AssigneeBetz Laboratories, Inc.
InventorDavid R. Haldeman
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Abstract
A method of dewatering bio-sludge is disclosed. This method comprises adding to the sludge, an effective amount for the purpose of an acrylamide/dimethylaminoethylmethacrylate methylchloride copolymer having a cationic charge density of 90%.
Claims9
Method of treating organic sludge of the type which has been treated to increase biological growth therein, comprising adding to said sludge an effective amount of a copolymer flocculant treatment, said copolymer consisting essentially of an acrylamide monomer and a cationic monomer, said cationic monomer comprising a quaternary ammonium salt of N,N dimethylaminoethylmethacrylate, wherein said cationic monomer is present in said copolymer in a molar ratio of about 80-90% cationic monomer:
- 20-10% acrylamide, said copolymer having a molecular weight of at least about one million, said method further comprising the step of dewatering said sludge.
Method of treating organic sludge of the type which has been treated to increase biological growth therein, comprising adding to said sludge an effective amount of a copolymer flocculant treatment, said copolymer consisting essentially of an acrylamide monomer and a cationic monomer, said cationic monomer comprising a quaternary ammonium salt of N,N dimethylaminoethylmethacrylate, wherein said cationic monomer is present in said copolymer in a molar ratio of about 80-90% cationic monomer:
- 20-10% acrylamide, said copolymer having an intrinsic viscosity of at least about 5 dl/g @ 30.degree. C. in 1 M NaCl, said method further comprising the step of dewatering said sludge.
Dependencies are inferred from the claim text.