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

Inactive Publication Date: 2013-07-03
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method cannot sufficiently suppress the proliferation of microorganisms, and the contamination of the semi-permeable membrane caused by the occurrence of biofouling cannot fully solve the problem of reduced water permeability.

Method used

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  • Fresh water generation method and fresh water generation device
  • Fresh water generation method and fresh water generation device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] use figure 1 The apparatus of the structure shown makes water.

[0085] That is, as the hollow fiber membrane module 4, one pressurized hollow fiber membrane module (HFU-2020) manufactured by Toray Co., Ltd. and having a molecular weight cut-off of 150,000 Da was used. hollow fiber UF membrane made of polyvinylidene fluoride, and the membrane area is 72m 2 , open the raw water supply valve 3 and the filter water valve 7, make the raw water supply pump 2 operate, and filter the seawater with a turbidity of 4 degrees, a TOC (Total Organic Carbon: total organic carbon) concentration of 2 mg / L, and a salt concentration of 3.5%. 3m / d for full filtration. In addition, as the semipermeable membrane unit 10, four polyamide reverse osmosis membrane units (TM820-400) manufactured by Toray Co., Ltd. were used, and the membrane filtration flow rate was 60 m 3 / d, concentrated water flow rate 120m 3 Filter under the condition of / d, recovery rate 33%.

[0086] During this perio...

Embodiment 2

[0092] Instead of ammonium chloride in Example 1, taurine as an amino-containing compound was added to raw water at 2.5% by weight, and then supplied to the semipermeable membrane unit 10 . Other than that, it carried out similarly to Example 1.

[0093] As a result, the transmembrane pressure difference of the hollow fiber membrane module 4 was 35 kPa immediately after the start of operation, but it was about 65 kPa two months later, and relatively stable operation was possible without chemical cleaning. In addition, the desalination rate of the semi-permeable membrane unit 10 was 99.7% immediately after the start of the operation, whereas it was 99.4% two months later, and was steadily changing. The transmembrane pressure difference of the semipermeable membrane unit 10 was 100 kPa immediately after the start of the operation, but was stable at about 130 kPa two months later.

Embodiment 3

[0095] One of the 24 steps performed from the back pressure cleaning step to the usual filtration step in Example 1 is carried out according to the following [step a], and the remaining 23 times are carried out according to the following [step b]. , carried out in the same manner as in Example 1.

[0096] [Process a]

[0097] (a-1) Simultaneously implement back pressure cleaning and air cleaning for 1 minute, the back pressure cleaning is carried out using water containing chlorine agent, and the water containing chlorine agent is added to the membrane filtration water of hollow fiber membrane module 4 The sodium hypochlorite in the chlorine agent storage tank 19 is obtained, and then the hollow fiber membrane module 4 is immersed in water containing the chlorine agent for 20 minutes. The free chlorine concentration in the back pressure washing water at this time was adjusted to 100 mg / L.

[0098] (a-2) After that, the drain valve 16 is opened to drain all the chlorine-conta...

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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.

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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Application Information

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IPC IPC(8): B01D65/06B01D61/58B01D65/02C02F1/44
CPCB01D61/14B01D65/02B01D2311/04B01D2311/12B01D2321/04B01D2321/168C02F1/444B01D61/02B01D61/58B01D65/06C02F1/44
Inventor 前田智宏
Owner TORAY IND INC
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