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US 2003/0178371 A1Published application
Polymeric compositions for dewatering sewage sludges
AssigneeCiba Specialty Chemicals Water Treatments Ltd.
InventorsPeter Ian Norman, Helen Elizabeth Read, Nils Berggren
Life of this patent
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Abstract
Compositions comprising of blends of polymeric materials, including a cationic polymer having an intrinsic viscosity of from 8 to 17 dl/g and a cationic content of from 20 to 100% which may be used in the dewatering of thermophilic sludges.
Claims16
A composition comprising:
- a) a cationic polymer having instrinsic viscosity of from 0.01 to 5 dl/g and a cationic content of from 20 to 100%,
- b) a cationic polymer having an intrinsic viscosity of from 8 to 17 dl/g and a cationic content of from 20 to 100%.
A method of preparing a composition in a non-aqueous liquid comprising:
- a) a cationic polymer having instrinsic viscosity of from 0.01 to 5 dl/g and a cationic content of from 20 to 100%,
- b) a cationic polymer having an intrinsic viscosity of from 8 to 17 dl/g and a cationic content of from 20 to 100%,
- wherein the components a) and b) are dispersed in the non-aqueous liquid, the ratio of component a) to component b) is from 90:10 to 10:90, and the intrinsic viscosity of the of the combined polymer components is from 4 to 15 dl/g, comprising of mixing components a) and b).
A liquid composition comprising a blend of:
- b) a cationic polymer having an intrinsic viscosity of from 8 to 17 dl/g and a cationic content of from 20 to 100%,
- c) a water soluble low IV cationic coagulant which has an IV of not more than 1.5 dl/g and preferably comprises a polyamine which is present in an amount of less than 25%, and the composition has a viscosity (Brookfield RVT, spindle 6, 20 rpm, 25° C.) of less than 30,000 cps and is a dispersion of component b) and component c) in an aqueous phase containing a water soluble inorganic salt.
Dependencies are inferred from the claim text.