Method and apparatus for treating oil-containing wastewater

It relates processing of oil-containing wastewater using membrane separation activated sludge method (MBR), even if a large amount of oil inflow, it is possible to suppress a decrease in biological treatment capabilities, new that can be suppressed the influence of the separation membrane St. propose a Do processing apparatus. In membrane separation activated sludge unit having a bioreactor and membrane separation tank, in a biological reaction tank, the first reaction chamber and the second reaction chamber is provided with at least one partition so as to vertically bypass flow, necessary further partitioned into separate reaction chamber in accordance with, provided with at least aerator and scum / oil skimmer in the first reaction chamber, taking out the mixture containing activated sludge from the membrane separation tank, at least a first reaction the mixture Suggest membrane bioreactor apparatus having an arrangement for returning was partitioned chamber and the second reaction chamber.