Auxiliary for dewatering of sludge
AssigneeSanyo Chemical Industries, Ltd.
InventorsKimihiko Noda, Yoji Fujiura, Yoichi Hasegawa
Life of this patent
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Abstract
Dewatering of sludge is accomplished by adding an organic fibrous material having the bulk specific gravity increased by being pressed or being wetted with water and a high molecular weight flocculant to the sludge, adjusting the resulting flocs to a diameter of not more than 1 mm, and subjecting the flocs to vacuum or pressure filtration.
Claims14
An auxiliary for dewatering a sludge, comprising a separability improving amount of at least one cationic polymeric flocculant and at least one organic fibrous material having the bulk specific gravity thereof increased to at least 0.3 g/cm.sup.3 by being pressed, wherein the weight ratio of said flocculant to said fibrous material is 1:01 to 1:1000, and wherein said fibrous material has a density not more than 0.1 g/cm.sup.3 before being pressed.
An auxiliary for dewatering a sludge, comprising a separability improving amount of at least one cationic polymeric flocculant and at least one crushed paper having the bulk specific gravity thereof increased to at least 0.3 g/cm.sup.3 by being wetted with water in an amount of from about 10 to 100% by weight of water based on the weight of said crushed paper, wherein the weight ratio of said flocculant to said crushed paper is 0:0.1 to 1:1000, and wherein said crushed paper has a density not more than 0.1 g/cm.sup.3 before being wetted with water.
A method for the manufacture of an auxiliary for dewatering, which method comprises pressing a mixture of a separability improving amount of at least one cationic polymeric flocculant and at least one organic fibrous material in a dry state to a density of at least 0.3 g/cm.sup.3, wherein the weight ratio of said flocculant to said fibrous material is 1:01 to 1:1000, and wherein said fibrous material has a density not more than 0.1 g/cm.sup.3 before being pressed.
Dependencies are inferred from the claim text.