Patent ID: 7288197

Claim:
A biological membrane filtration water treatment system, which comprises a biological filtration bed zone tank and a membrane separation zone tank, wherein the biological filtration bed zone tank comprises a microorganism-containing mixed liquor and a plurality of porous carriers in the mixed liquor; and the membrane separation zone tank comprises treatment water formed by the effluent from the biological filtration bed zone tank, and a filtration module immersed below the water surface of the treatment water, wherein the filtration module has a permeation side, and the treatment water and the permeation side form a fluid communication only through the filtration module, wherein the biological filtration bed zone tank further comprises an aeration device installed at the base of the biological filtration bed zone tank; a support screen installed in the biological filtration bed zone tank and located above the aeration device for preventing the plurality of porous carriers from coming close to the base of the biological filtration bed zone tank; and, a filtration screen installed in the biological filtration bed zone tank and above the plurality of porous carriers for preventing the plurality of porous carriers from entraining out of the biological filtration bed zone tank along with the effluent.