Muddy water dewatering method and system

摘要

PROBLEM TO BE SOLVED: To provide a method and system for dewatering muddy water which can stably obtain dehydrated cakes having a fixed strength.SOLUTION: The muddy water is reacted with a flocculant in a flocculation reaction tank 3 to generate flocculated muddy water. The flocculated muddy water is drained off by a rotating drum screen 41, and then compressed and dehydrated by a screw press 5 to generate dehydrated cakes C having a predetermined water content. The rotational speeds of the drum screen 41 optimum for a plurality of muddy waters different in concentration are obtained as data with respect to the respective concentrations of the muddy waters. While referring the data, the rotation drive of the drum screen 41 is controlled, and the amount of the flocculated muddy water supplied from the flocculation reaction tank 3 to the drum screen 41 per unit time is controlled so as to be optimum.