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US 7,745,529 B2Granted
Flocculant composition and method for manufacturing the same
AssigneeHymo Corporation
InventorsRyousuke Yonemoto, Syougo Wakatuki
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AssigneeHymo Corporation
InventorsRyousuke Yonemoto, Syougo Wakatuki
Estimating the term…
A flocculent composition and a method for manufacturing the same are provided. The flocculent composition has an excellent ability to adhere to suspended particles, does not cause an increase in the viscosity of sludge, provides good drainage during mechanical dewatering to allow a reduction in the water content of a cake, and is applicable to various types of sludge. These characteristics are obtained by utilizing advantages of a crosslinking water-soluble polymer and a linear water-soluble polymer and changing the compounding ratio of the crosslinking water-soluble polymer to the linear water-soluble polymer according to the form of the size distribution of sludge particles. The flocculent composition includes a vinyl crosslinking water-soluble polymer (A) having a charge inclusion ratio of 20% or more and a vinyl linear water-soluble polymer (B) having a charge inclusion ratio of 5% or more and less than 20%. The flocculant composition is preferably configured such that the compounding ratio of the vinyl crosslinking water-soluble polymer (A) having a charge inclusion ratio of 20% or more to the vinyl linear water-soluble polymer (B) having a charge inclusion ratio of 5% or more and less than 20% is changed according to a change in the percent by mass of 200-mesh particles in sludge based on the total mass of the suspended particles in the sludge.
A flocculant composition comprising a vinyl crosslinking water-soluble ionic polymer (A) having a charge inclusion ratio of 20% or more and a vinyl linear water-soluble ionic polymer (B) having a charge inclusion ratio of 5% or more and less than 20%, wherein a compounding ratio (a/b) of the vinyl crosslinking water-soluble ionic polymer (A) to the vinyl linear water-soluble ionic polymer (B) is changed according to an amount in percent by mass of 200-mesh particles based on a total mass of suspended particles in a sludge so as to satisfy 0.2≦a/b≦9 when 0<X≦10 percent by mass, 0.4≦a/b≦3 when 10<X≦20 percent by mass, and 0.1≦a/b≦2 when 20<X≦60 percent by mass, where X is an amount of percent by mass of the 200-mesh particles in the sludge, a is an amount in percent by mass of the vinyl crosslinking water-soluble ionic polymer (A), and b is an amount in percent by mass of the vinyl polymer type linear water-soluble ionic polymer (B).
A method for manufacturing a flocculant composition, characterized by changing a compounding ratio of the vinyl crosslinking water-soluble ionic polymer (A) having a charge inclusion ratio of 20% or more to a vinyl linear water-soluble ionic polymer (B) having a charge inclusion ratio of 5% or more and less than 20% according to a change in percent by mass of 200-mesh particles in sludge based on a total mass of suspended particles in the sludge.
Dependencies are inferred from the claim text.