IMMERSION-TYPE MEMBRANE SEPARATION ACTIVATING SLUDGE TREATING EQUIPMENT

PROBLEM TO BE SOLVED: To provide an immersion-type membrane separation activating sludge treating equipment capable of conducting sufficient oxygen supply and membrane separation which are necessary for the biological treatment in a single tank even BOD flowing inside a system is high. SOLUTION: A membrane case unit 32 is constituted by arranging a plurality of plate like membrane cartridges 35 so as to leave a specified interval between faces of the membrane with the faces of the membrane in the vertical direction inside a membrane case 34 whose top and bottom are opened. A plurality of membrane case units 32 are arranged inside a membrane separation tank 31 so as to leave a specified interval, a diffuser is arranged in the downward of the each membrane case unit 32, and an auxiliary diffuser 36 is arranged in the sideward of the each membrane case unit 32. A partition wall 37 is arranged between the each membrane case unit 32 and the auxiliary diffuser 36. An upward stream passage 38 for communicating with the surrounding region inside the tank is formed throughout the upward of the auxiliary diffuser 36 on the upper end side and the lower end side of the partition wall 37, and a supply port 40a for water to be treated is arranged in the lower region of the each upward stream passage 38.