The invention provides a
membrane bioreactor device for retarding membrane
pollution and a
sewage treatment method. The
membrane bioreactor device is characterized in that a three-phase separator is arranged in a
membrane bioreactor, and a
sewage treatment device with a membrane
reaction zone at the upper part and a contact
oxidation zone at the lower part is formed;
sewage enters the contact
oxidation zone from the bottom of the reactor and then enters the membrane
reaction zone from a slit of the three-phase separator; under the combined action of the absorption of
activated sludge and the interception of membranes, the treatment of the sewage is realized; with the adoption of a rotating membrane filtering component, the rotating
shear force is increased to retard the membrane
pollution, and meanwhile, the fact that all the membranes have uniform cleaning strength is guaranteed, and cleaning dead corners are reduced; the three-phase separator is connected with a gas
guide tube, so that residual gas in the contact
oxidation zone is guided into the membrane
reaction zone at the upper part to be used as a gas washing source of a membrane component, therefore the
energy consumption is reduced; online ultrasonic cleaning and
chemical cleaning equipment is arranged to reduce the
assembly and disassembly procedures in the membrane cleaning process. The
sewage treatment device and method have the advantages of high treatment efficiency, small membrane
pollution, stable
effluent water quality and good convenience in operation and management.