Membrane separation method and membrane separation device

Abstract

Disclosed are a membrane separation method and a membrane separation device, each of which enables to reduce deterioration in membrane separation performance during membrane separation of water to be processed by reducing adsorption of membrane contaminating materials contained in the water onto the membrane surface. Specifically, water to be processed is subjected to membrane separation after being added with particles made of a cationic polymer which swells but does not substantially dissolve in water.

Description

Membrane separation method and membrane separation device technical field The invention relates to reducing the adsorption and inhibition of membrane pollutants contained in the treated water on the surface of the membrane when the treated water such as industrial water, urban water supply, well water, river water, lake water, and factory waste water is subjected to membrane separation treatment. Membrane separation method and membrane separation device for deterioration of membrane separation performance. Background technique As a method of treating industrial water, urban water supply, well water, river water, lake water, factory wastewater, etc. to be treated to produce pure water, for example, there are methods of passing water through microfiltration membranes (MF membranes), ultrafiltration membranes, etc. (UF membrane), reverse osmosis membrane (RO membrane) and other membrane separation treatment methods. Because industrial water, urban water supply, well water, e...

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Problems solved by technology

Because industrial water, urban water supply, well water, etc. usually contain humic acid, fulvic acid organic matter, biological metabolites such as sugars produced by algae, synthetic chemical substances such as surfactants, etc., membrane fouling substances that pollute the membrane, Therefore, there is a problem that if membrane separation treatment is performed, these membrane fouling substances are adsorbed on the surface of the membrane, and the membrane separation performance is degraded.

However, there is a new problem that if a polymer coagulant is added, the polymer coagulant remaining in the water will be adsorbed on the subsequent membrane to contaminate the membrane, deteriorating the separation performance of the membrane

However, in the method of this Patent Document 1, it is necessary to add an inorganic coagulant and a polymer coagulant to the water to be treated, and then add an inorganic coagulant. Therefore, a simpler method is being sought.

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