MEMBRANE TREATMENT DEVICE

PROBLEM TO BE SOLVED: To provide a membrane treatment device for dispensing with cleaning of a diffuser.SOLUTION: A membrane treatment device comprises a water tank 1, a diffuser 3 formed by soaking in the water tank 1 and a membrane filtration device 2 provided in an upper part of the diffuser 3 and soaked in the water tank 1, and the diffuser 3 is composed of (A) a diffuser pipe 30 having a plurality of diffuser holes on the lower end and (B) a diffuser nozzle provided by extending downward in the respective diffuser holes, and the diffuser nozzle is opened on the lower end, and a small hole is provided on a lower side surface of the diffuser nozzle, and a gas-liquid interface is formed in a part of the small hole, and a space is formed between the lower end of the diffuser pipe 30 and the gas-liquid interface.SELECTED DRAWING: Figure 1 【課題】散気装置の洗浄が不要な膜処理装置を提供すること。【解決手段】水槽1と、該水槽1に浸漬してなる散気装置3と、該散気装置3の上部に設けられ、水槽1に浸漬された膜ろ過装置2と、を備え、散気装置3は、（Ａ）下端に複数の散気孔を有する散気管30と、（Ｂ）該散気孔の各々に、下方に延びて設けられる散気ノズルとからなり、散気ノズルは、下端が開口しており、散気ノズルの下部側面に小孔を設けてなり、小孔の部位に気液界面が形成されると共に、散気管30の下端と気液界面との間に空間を形成してなる。【選択図】図1