FLOCCULATION REACTION DEVICE AND FLOCCULATION REACTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a flocculation reaction device capable of suppressing a driving force required for driving an agitator from increasing, and capable of easily forming a coarse flocculated floc.SOLUTION: The flocculation reaction device includes a flocculation tank 10 in which a rapid agitation zone 16 and a slow agitation zone 17 are formed, a supply passage 13 for sludge 2 which communicates with the rapid agitation zone 16, a discharge passage 14 for the sludge 2 which communicates with the slow agitation zone 17, a first agitator 11 to rapidly agitate the sludge 2 of the rapid agitation zone 16, and a second agitator 12 to rapidly agitate the sludge 2 of the slow agitation zone 17, and also includes a flocculant adding means 15 for adding the flocculant 3 to each of the rapid agitation zone 16 and the slow agitation zone 17.