| abstract |
Provided is a waste water treatment method, in which, in a separation membrane activated sludge method, an influence on an original activated sludge treatment environment is small, clogging of a separation membrane is suppressed, and a long service life of the separation membrane and efficiency of waste water treatment equipment operation can be achieved, and a waste water treatment equipment therefor and an activator for waste water treatment. n In the waste water treatment method for introducing waste water containing an organic substance into a treatment tank and applying activated sludge treatment thereto, and performing solid-liquid separation of the waste water after the activated sludge treatment by using the separation membrane installed in the treatment tank to remove treated water, while dominating microorganisms for improving a state of clogging of the separation membrane, an activator containing a component for activating the microorganisms, and the activator having a particle size less than 10 µm in 30% or more of the number in total, and a particle size over 100 µm in the number less than 10% in total, is added to the waste water to be subjected to activated sludge treatment in the treatment tank. The microorganisms for improving the state of clogging of the separation membrane preferably contain Bacillus bacteria. |