WATER TREATMENT METHOD

摘要

Provided is a water treatment method, which performs floatation separation after flocculation of irrigation and drainage water, the method being capable of performing the floatation separation efficiently. A water treatment method provided with a flocculation reaction process for adding a flocculant to the water to be treated and performing a flocculation reaction and a floatation separation process for solid-liquid separation of the flocculated water flowing out of the flocculation reaction process. The method is characterized in that the flocculant is a cationic polymeric flocculant with hydrophobic functional groups. An inorganic flocculant or other polymeric flocculant can be used together with the cationic polymeric flocculant with hydrophobic functional groups.