WASTEWATER TREATMENT DEVICE

摘要

Provided is a wastewater treatment device that can stably treat wastewater even if water quality fluctuations are large. The wastewater treatment device includes: a first biological treatment device (10) that treats wastewater by means of a membrane-separated activated sludge method; a second biological treatment device (20) that treats wastewater by means of a biofilm method; measurement units (31, 32) that measure the flow rate and load concentration in the wastewater flowing upstream of the first biological treatment device (10) and the second biological treatment device (20); and a control unit (30) that calculates the load quantity from the flow rate and the load concentration, determines in accordance with the load quantity a distribution ratio between the flow rate of the wastewater supplied to the first biological treatment device (10) and the flow rate of the wastewater supplied to the second biological treatment device (20), and on the basis of the distribution ratio, adjusts the flow rate of the wastewater supplied to the first biological treatment device (10) and the flow rate of the wastewater supplied to the second biological treatment device (20).