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Method for washing hollow fiber membrane module and hollow fiber membrane filtration device

A cleaning method and a technology of a filtering device, which are applied in the field of cleaning of hollow fiber membrane modules and hollow fiber membrane filtration devices, and can solve problems such as twisting and bending of hollow fiber membranes

Inactive Publication Date: 2018-11-23
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If it is a hollow fiber membrane with only the upper end fixed, strong air cleaning may cause the hollow fiber membrane at the lower part of the membrane module to twist and bend

Method used

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  • Method for washing hollow fiber membrane module and hollow fiber membrane filtration device
  • Method for washing hollow fiber membrane module and hollow fiber membrane filtration device
  • Method for washing hollow fiber membrane module and hollow fiber membrane filtration device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] exist figure 1 In the shown hollow fiber membrane filtration device including the hollow fiber membrane module, the raw water was passed through the water conduit 4 for 30 minutes to perform filtration treatment. Tap water was stored in a raw water tank, and 10 mg / L of bentonite and 5 mg / L of sodium humate were added. Then, sodium bicarbonate manufactured by KISHIDA CHEMICAL and sulfuric acid manufactured by KISHIDA CHEMICAL were added to adjust the pH to 8.0. Water was sent from the raw water tank to the coagulation tank by a pump, and the residence time was set to 10 minutes. What added 100 mg / L of industrial ferric chloride (concentration 38%) before the coagulation tank was used as raw water. The structure of the hollow fiber membrane module is as follows.

[0069] Container 1: inner diameter 200mm, height 1300mm.

[0070] Hollow fiber: UF membrane made of polyvinylidene fluoride with an inner diameter of 0.75mm, an outer diameter of 1.25mm, and an effective leng...

Embodiment 2

[0076] The same treatment as in Example 1 was performed except that the backwash water was discharged from the drain port 6 . The measurement results are shown in Table 1.

Embodiment 3

[0078] The same treatment as in Example 1 was performed except that the backwash water was discharged from the drain port 6 and then discharged from the concentrated water outlet 8 . The measurement results are shown in Table 1.

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PUM

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Abstract

Provided are a method for washing a hollow fiber membrane module, which can thoroughly and sufficiently eliminate solids attached to the hollow fiber membrane, and a hollow fiber membrane filtration device. The hollow fiber membrane filtration device is provided with a hollow fiber membrane module having: a container 1 having a treated water outlet 5 and a concentrated water outlet 8; a pluralityof hollow fiber membranes 2 that are hollow fiber membranes 2 for separating raw water into permeating water and concentrated water and that are disposed in the vertical direction in the container 1;an upper end securing unit 3 disposed in the upper part of the container 1 for securing the upper ends of the hollow fiber membranes 2; a permeating water chamber 7 that is formed on the upper side ofthe upper end securing unit 3 and to which the inside of each hollow fiber membrane 2 is connected; and a water conveying pipe 4 for supplying raw water to the inside of the container 1. The water conveying pipe 4 extends in the vertical direction to the lower side of the upper end securing unit 3 and is provided with a plurality of spray holes 4a for spraying raw water on side peripheral surfaces. A raw water pipe and an air introducing means are connected to the water conveying pipe 4. A water discharge opening 6 for discharging washing wastewater when bubbling cleaning that blows air fromthe plurality of spray holes 4a is carried out is provided in the lower part of the container 1.

Description

technical field [0001] The invention relates to a cleaning method of a hollow fiber membrane module and a hollow fiber membrane filtering device, in particular to a cleaning method of a hollow fiber membrane module and a hollow fiber membrane filtering device capable of fully cleaning and removing suspended matter attached to the membrane. Background technique [0002] Hollow fiber membrane modules are used as a mechanism for removing suspended matter and organic matter, and are widely used in the fields of pure water production and wastewater recovery. As the membrane of the hollow fiber membrane module, microfiltration membranes (MF membranes) or ultrafiltration membranes (UF membranes), etc. are used according to the separation object. Generally, the former has pores of about 0.1 μm and the latter has pores of 0.005 to 0.5 μm. [0003] If the suspended water supplied to the hollow fiber membrane module contains a large amount of suspended matter or organic matter, not onl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/02B01D63/02B01D65/06
CPCB01D65/02B01D2321/185B01D2313/26C02F1/444C02F2303/14C02F2303/16B01D63/0241B01D69/08B01D2321/04B01D2321/16B01D63/04C02F1/44
Inventor 多田景二郎
Owner KURITA WATER INDUSTRIES LTD