SELF-WASHING TANK HOLDING TYPE MEMBRANE FILTRATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a self-washing tank holding type membrane filtration apparatus which enables efficient injection of a chemical uniformly into individual membrane modules and sampling the membrane filtrate uniformly without deviation from the individual module membranes.SOLUTION: A reverse washing measurement tank 4 is housed in a washing water tank 3, and a water passage space 60 is formed between the inner wall of the washing water tank 3 and the outer wall of the reverse washing measurement tank 4. A communication hole 4a connecting the reverse washing measurement tank 4 with the water passage space 60 is formed in the bottom part of the reverse washing measurement tank 4. A plurality of membrane modules 7 are erected outside the washing water tank 3. A piping member 49 provided with a pipe body 51 is arranged in the reverse washing measurement tank 4. The pipe body 51 has a double pipe structure in which a membrane filtrate sampling tube 51b is arranged inside a chemical injection pipe 51a and extends vertically, and its lower end is arranged close to the communication hole 4a.