公开(公告)号：US20210230039A1

公开(公告)日：2021-07-29

申请号：US15733867

申请日：2019-05-30

Applicant: KURITA WATER INDUSTRIES LTD.

Inventor： Shigeru SATO ,  Shihoko SEKIGUCHI ,  Minoru WATANABE

IPC: C02F11/147 ,  C08F120/34 ,  C08F120/56 ,  C08L33/16 ,  C08L33/26

Abstract: Provided is a sludge dehydration agent which enables the formation of stiff and coarse flocs even when added in a relatively small amount, has excellent gravity filtration properties, enables the production of a dehydrated cake having a low water content, and also enables an efficient dehydration treatment. A sludge dehydration agent comprising a polymer having a constituent unit derived from a cationic monomer, wherein the colloid equivalent value decrease rate of the polymer, which is calculated from mathematical formula 1, is 10% or more. (In mathematical formula 1, the colloid equivalent value (I) is a colloid equivalent value at pH 4 which is measured in deionized water by a colloid titration method, and the colloid equivalent value (II) is a colloid equivalent value at pH 4 which is measured in salt water having a concentration of 0.01 mol/L by a colloid titration method.)