A method of operating a hollow fiber membrane module

An operation method and fiber membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as high energy consumption, failure to consider waste water recycling, poor flushing effect, etc., and achieve reduced water production , reduced service life, and increased filter resistance

Active Publication Date: 2022-08-09
TORAY ADVANCED MATERIALS RES LAB CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention aims at the disadvantages of poor flushing effect, high energy consumption, and failure to consider the recycling of waste water in the above positive flushing method, and provides a new type of hollow fiber How Fiber Membrane Modules Work

Method used

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  • A method of operating a hollow fiber membrane module
  • A method of operating a hollow fiber membrane module
  • A method of operating a hollow fiber membrane module

Examples

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reference example 1

[0141] To produce hollow fiber membrane fibers with spherical structure, a polymer solution in which 38 parts by mass of fluorinated polyvinylidene chloride fiber homopolymer with an average weight molecular weight of 417,000 and 62 parts by mass of γ-butyrolactone was mixed and dissolved at 160 degrees was prepared. This polymer solution, an aqueous solution of 85% γ-butyrolactone by weight, was sprayed from the cover of the double pipe as a hollow part-forming liquid, and an aqueous solution of 85% γ-butyrolactone with a temperature of 20 was set 30 mm below the cover. The composition of the cooling bath solidifies.

[0142] Next, 14 parts by mass of fluorinated polyvinylidene chloride fiber homopolymer with an average weight molecular weight of 284,000, 1 part by mass of cellulose acetate propionate (CAP482-0.5, manufactured by イーストマンケミカル Co., Ltd.), N-methyl-2-pyrrolidone Mix 77 parts by mass, sorbitan polyoxyethylene fatty acid ester (manufactured by Sanyo Chemical Indust...

Embodiment 1

[0144] (Production of hollow fiber membrane modules)

[0145] The hollow fiber membrane of Reference Example 1 was soaked in a 30% glycerin aqueous solution by weight for 1 hour, and then air-dried. One end of the hollow fiber membrane filament was sealed with silicone glue (made by Toray & Co., Ltd., SH850A / B glue, the two were mixed in a weight ratio of 1:1).

[0146] Case 22 made of polyvinyl chloride resin (inner diameter 77mm, inner diameter of rectification cylinder outer periphery 90mm, length 1900mm, inner diameter of casing side discharge port 24mm), rectification cylinder 29 (outer diameter 75mm, inner diameter 71mm), center pipe 31 (outer diameter 24mm, 20mm ID) surface, areas bonded with pouring filler, pre-filed with sandpaper (#80) and degreased with ethanol.

[0147] To the permeated water end ( Figure 13 The end of the right end) on the sealing side is arranged with hollow fiber membrane fibers, and a water-producing end curing cover 35 is attached. At the ...

Embodiment 2

[0166] Twelve first rectification holes with a height of 10 mm and a width of 8 mm (rectangular) are uniformly arranged on the surface of the rectification cylinder that is irrigated and filled at the lower side of the water production end 23 of the module. The method of mixing positive flushing of 0.2m / s liquid phase and 0.2m / s gas phase is adopted. The positive flushing time is 120s. The flushing water is flowing to the original water tank. After the positive flushing, the membrane filtration with a flux of 80LMH and a filtration time of 120min was carried out, and backwashing was carried out after filtration. After backwashing, the liquid in the module is emptied, and the 0.2m / s liquid phase and 0.2m / s gas phase are mixed for positive flushing, filtration, and backflushing. Others are the same as in Example 1. The turbidity discharge rate of the hollow fiber membrane module reached 93%, as shown in Table 1.

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Abstract

An operation method of a hollow fiber membrane module includes forward flushing on the primary side, membrane filtration of raw water, and backwashing of filtered water on the secondary side. The forward flushing on the primary side includes flushing with a liquid phase flow or a mixed phase flow of gas and liquid. This operation method ensures excellent turbidity discharge of the module and can effectively prevent the problem of membrane filament breakage. At the same time, the structure of the module includes that the fluid flowing from the outside of the hollow fiber membrane during the primary side positive flushing flows to the center part in the radial direction of the lower side of the water production end irrigation and filling part, and from the radial direction of the lower side of the water production end irrigation and filling part. The center part flows radially outward in the radial direction, resulting in a rectifying effect. It effectively prevents the occurrence of bias flow in the upper part of the module during primary side flushing and further improves the turbidity discharge performance of the module.

Description

Technical field [0001] The present invention relates to an operating method suitable for hollow fiber membrane modules and a module used in the treatment of high-contamination raw water. Background technique [0002] In recent years, with the improvement of water resource utilization requirements and the development of membrane technology, hollow fiber membrane technology has received more and more attention in the field of water treatment due to its characteristics of saving energy, saving space, and stable water quality. , especially in the treatment of highly turbid raw water, such as highly turbid surface water and industrial wastewater, its application is increasing. [0003] However, after long-term operation of hollow fiber membrane modules, retentates such as inorganic substances, organic substances, bacteria, and biofilms will inevitably form a pollution layer on the membrane surface or the membrane pores will be blocked by pollutants, resulting in a decrease in flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02B01D61/14B01D61/00B01D63/02C02F1/44
CPCB01D61/00B01D61/145B01D63/02B01D65/02C02F1/44C02F1/444B01D2321/04B01D2321/02Y02W10/10
Inventor 张金龙常春杨瑜芳小林敦
Owner TORAY ADVANCED MATERIALS RES LAB CHINA
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