WASTE WATER TREATMENT METHOD AND APPARATUS

摘要

PROBLEM TO BE SOLVED: To control a load in a membrane separation activated sludge treatment tank in a proper range to ensure treatment capacity in the membrane separation activated sludge treatment tank even when a load of raw water is fluctuated.SOLUTION: In a waste water treatment method (a waste water treatment apparatus 1), a set value S1 used in a supply amount control process is set beforehand (in a supply amount control device 50). The supply amount control process (the supply amount control device 50) includes a low load control step L and a high load control step H. The low load control step L is a step where raw water R is not supplied to a carrier tank 10 but supplied to a membrane separation activated sludge treatment tank 20 when the load of the raw water R measured in a load measuring step (a load measuring device 40) is less than the set value S1. The high load control step H is a step where at least a part of the raw water R is supplied to the carrier tank 10 when the load of the raw water R measured in the load measuring step (the load measuring device 40) is equal to or larger than the set value S1.