METHOD AND APPARATUS FOR BACKWASHING MEMBRANE MODULE FOR REMOVING TURBIDNESS

METHOD AND APPARATUS FOR BACKWASHING MEMBRANE MODULE FOR REMOVING TURBIDNESS

PROBLEM TO BE SOLVED: To provide a method for backwashing a membrane module for removing turbidness, by which the flux through the membrane module can be made high and the membrane module can stably be operated continuously for a long period of time. SOLUTION: Raw water 1 is filtered by using the me...

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Hauptverfasser: KOJIMA YASUNARI, NAGANAMI KANROKU, MIYAKI HITOSHI
Format: Patent
Sprache:eng
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CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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creator KOJIMA YASUNARI
NAGANAMI KANROKU
MIYAKI HITOSHI
description PROBLEM TO BE SOLVED: To provide a method for backwashing a membrane module for removing turbidness, by which the flux through the membrane module can be made high and the membrane module can stably be operated continuously for a long period of time. SOLUTION: Raw water 1 is filtered by using the membrane module 5 consisting of a hollow fiber membrane to obtain a filtrate. This method for backwashing the module 5 is carried out by combining a filtration step to obtain the filtrate by making the water 1 pass through the module 5 with a backwashing step to backwash the module 5 by the germicide 8-injected backwashing water and another backwashing step to backwash the module 5 by the acid 9-injected backwashing water. Citric acid, ammonium dihydrogen citrate or a mixed acid of citric acid and glycolic acid is used as the acid 9 and is injected so that the citric acid concentration in the module 5 becomes 50-1,500 mg/L. Otherwise, an inorganic acid is used as the acid 9 and is injected so that the pH in the module 5 becomes 1.0-3.0. COPYRIGHT: (C)2004,JPO&NCIPI
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subjects CHEMISTRY
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
title METHOD AND APPARATUS FOR BACKWASHING MEMBRANE MODULE FOR REMOVING TURBIDNESS
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