WASTEWATER TREATING AGENT, METHOD FOR WASTEWATER TREATMENT, SLUDGE DEHYDRANT, AND METHOD FOR SLUDGE TREATMENT

摘要

A wastewater treating agent and a sludge dehydrant each containing a sulfonated styrene polymer or a salt thereof as the active ingredient. For use as the wastewater treating agent, either a sulfonated styrene polymer whose 1 wt.% aqueous solution has a viscosity at 25 DEG C of 10 to 20,000 mPa•s when it contains a neutral salt in a concentration of 0.01 to 5 N or a salt of the polymer is added to various wastewaters to purify the same. For use as the sludge dehydrant, a sulfonated styrene polymer having a weight-average molecular weight of 1,100,000 or higher or a salt thereof is used for sludge treatment in combination with a cationic high-molecular coagulant or an inorganic coagulant.