MEMBRANE FILTRATION SYSTEM

• Main Authors: ISHIZUKA MIWA, MATSUSHIRO TAKESHI, KUROKAWA FUTOSHI, KURIHARA SHIOKO, SHIIRE HIDETAKE, ARIMURA RYOICHI
• Format: Patent
• Language: English
• Published: 22.08.2013
• 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 improve cleaning efficiency of a pretreatment membrane used with a reverse osmosis membrane.SOLUTION: A membrane filtration system includes: a pretreatment membrane; a high-pressure pump; a reverse osmosis membrane; and a fine bubble generator. The pretreatment membrane removes an insoluble component contained in water to be treated. The high-pressure pump applies pressure to the water to be treated from which the insoluble component is removed by the pretreatment membrane. The reverse osmosis membrane separates the water to be treated to which the pressure is applied into treatment water from which a soluble component containing the water to be treated is removed and concentrated water in which the soluble component is concentrated. The fine bubble generator generates fine bubbles by introducing the concentrated water discharged from the reverse osmosis membrane at high pressure and supplies the pretreatment membrane during cleaning with the concentrated water containing the fine bubbles.