MEMBRANE FILTRATION APPARATUS AND WATER PRODUCTION APPARATUS, AND CLEANING METHOD OF MEMBRANE FILTRATION APPARATUS

• Main Authors: ISHIZUKA MIWA, MATSUSHIRO TAKESHI, KUROKAWA FUTOSHI, KURIHARA SHIOKO, SHIIRE HIDETAKE, ARIMURA RYOICHI
• Format: Patent
• Language: English
• Published: 26.09.2013
• Subjects: CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To provide a membrane filtration apparatus in which clogging of a membrane module can be eliminated in a short period of time with high reliability.SOLUTION: A membrane filtration apparatus 5 filters insoluble components in raw water from raw water A by means of a membrane module 11, and eliminates clogging of the membrane module 11 caused by filtration, and includes a water feed pump 13, a cleaning water pump 21, draining piping 23, pressure difference detection means 17, 19 and a controller 28. Cleaning water is fed to the membrane module 11 by the cleaning water pump 21 so as to flow from a secondary side to a primary side, and the fed cleaning water is discharged through the draining piping 23 connected to the primary side of the membrane module 11. Pressure difference between the primary side and the secondary side of the membrane module 11 during filtration is detected by the pressure difference detection means 17, 19. The flow rate of the cleaning water is controlled by the controller 28 to keep the detected pressure difference constant, and is also controlled in such a manner that the pressure difference is kept in a range equal to or more than the pressure difference between the primary side and the secondary side of the membrane module 11 during filtration and less than the withstand pressure of the membrane module 11.