| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating drainage without increasing cost even when an organic polymer flocculant is used by improving a flocculation effect in a floating treatment of the drainage or a sedimentation treatment of the drainage, nor increasing a sludge amount by avoiding the use of an inorganic flocculant or restraining the addition amount thereof as low as possible.SOLUTION: A specific cationic monomer or a monomer mixture formed of the cationic monomer and a nonionic monomer is agitated in an aqueous salt solution by making a water-soluble polymer soluble in the aqueous salt solution coexist as a dispersant, a dispersion liquid formed of dispersed and polymerized water-soluble polymer fine particles is added to drainage in a state of the dispersion liquid without being diluted, or dilution water is mixed in the dispersion liquid, and a produced imperfect dissolved mixture is added to the drainage, whereby the problem can be solved. |
