WASTE WATER TREATMENT DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a waste water treatment device that can stably treat waste water even if water quality fluctuates largely.SOLUTION: The waste water treatment device includes: a first biological treatment device 10 that treats waste water by means of a membrane-separated activated sludge method; a second biological treatment device 20 that treats waste water by means of a biofilm method; measurement units 31, 32 that measure a load concentration and a flow rate in the waste water flowing upstream of the first biological treatment device 10 and the second biological treatment device 20; and a control unit 30 that calculates load quantity from the load concentration and the flow rate, determines in accordance with the load quantity a distribution ratio between the flow rate of the waste water supplied to the first biological treatment device 10 and the flow rate of the waste water supplied to the second biological treatment device 20, and on the basis of the distribution ratio, adjusts the flow rate of the waste water supplied to the first biological treatment device 10 and the flow rate of the waste water supplied to the second biological treatment device 20.