Fresh water generation method and fresh water generation device

A water-making and raw water technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve semi-permeable membrane pollution, cannot fully inhibit microbial proliferation, and cannot fully solve water permeability reduce problems, achieve the effect of cost reduction and prevention of oxidation deterioration
CN103189130AInactive Publication Date: 2013-07-03TORAY IND INC
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
TORAY IND INC
Publication Date
2013-07-03
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

To prevent an oxidation degradation of a semipermeable membrane and an increase in bio-fouling therein and avoid a cost increase due to chemicals or the like, in a fresh water generation method in which raw water is subjected to a membrane filtration with a microfiltration / ultrafiltration membrane module and then subjected to a membrane filtration with a semipermeable membrane unit, the membrane filtration in the microfiltration / ultrafiltration membrane module is temporarily stopped, chlorine agent containing water is supplied from a secondary side of the microfiltration / ultrafiltration membrane module to perform counter pressure cleaning of the microfiltration / ultrafiltration membrane module, and thereafter an ammonia compound and / or an amino compound is added to a primary side of the microfiltration / ultrafiltration membrane module to restart the membrane filtration in the microfiltration / ultrafiltration membrane module.
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Description

technical field

[0001] The present invention relates to a water-making method and a water-making device. The water-making method utilizes a microporous filtration / ultrafiltration membrane (hereinafter referred to as MF / UF membrane) module to perform membrane filtration on raw water, and utilizes a reverse osmosis membrane (RO membrane) or The semi-permeable membrane unit of the nanofiltration membrane (NF membrane) filters water through the membrane for membrane filtration. In particular, the present invention relates to a water generation method characterized by a method for cleaning MF / UF membrane modules in the above water generation method, and a water generation device that can suitably implement the water generation method. Background technique

[0002] In recent years, in water treatment applications such as sewer and waste water treatment, the use of membrane filtration to remove impurities in raw water and convert it into clarified water has been widely spread. The...

Claims

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