PURPOSE: To control the adhesion and growth of a biological layer (slime) to a membrane face and retain a water permeating flux to the membrane face at a high level without providing the high flow rate on the membrane face of a membrane separating device and applying the operation of flowing suspen sion water or gas-liquid mixed liquid containing particles and scraping off an adhesion layer on the membrane face in a membrane separating device using biologically treated water from a biological reaction tank as raw water.
CONSTITUTION: In the membrane separating device in which water in a storage tank 3 for permeated water is flowed backward to a membrane separating device main body 2 through an intake line 13 for backwashing, a chlorine injection means (pump P2, piping 16) for injection chlorine in a chlorine source tank 4 for the given time before storing backwash is mounted on the permeated water intake line 13.
IMAI KAZUO
TAKEUCHI OSAMU
| JPS5624006A | 1981-03-07 |