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Cleaning method for membrane filter device

A membrane filtration and cleaning liquid technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of deformation of membrane filaments, poor cleaning effect, and insufficient cleaning effect, and achieve extended service life, Good cleaning effect and the effect of reducing the amount of cleaning water

Inactive Publication Date: 2007-07-11
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the physical cleaning methods, low-pressure high-speed forward flushing and backflushing are commonly used. The backflushing cleaning method is considered to be an effective physical hydraulic cleaning method, but for polymer membranes, the cleaning effect is not significant enough.
Because the membrane filaments are deformed during cleaning, especially for internal pressure hollow fiber membranes or capillary membranes, the cleaning effect is often not good

Method used

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  • Cleaning method for membrane filter device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] The polyvinyl chloride capillary ultrafiltration membrane device filters the fulvic acid solution with a TOC of about 5mg / L. When the flux of the polluted membrane drops to 25% of the initial value, the permeation flux of the membrane after cleaning will only recover 80% at the initial time, and adopt the present invention, promptly adopt forward flushing (forward flushing flow rate is 2.5mL / s) to be full of membrane silk earlier, after about 3sec, start recoil (recoil pressure is 2.0 Mpa), forward recoil At the same time, after 20 sec, the flux of the polluted membrane filaments recovered to 99% of the initial value.

Embodiment 2

[0016] Polyvinyl chloride capillary ultrafiltration membrane device filters polysaccharide solution with a TOC of about 5mg / L. When the flux of the polluted membrane drops to 30% of the initial value, the permeation flux of the membrane after cleaning can only recover to 30% of the initial value. 85% at the initial stage, and adopt the present invention, promptly adopt forward flushing (forward flushing flow rate is 2.8mL / s) to be full of membrane silk first, after about 2.5sec, start recoil (recoil pressure is 2.2Mpa), forward recoil At the same time, after 15 sec, the flux of the polluted membrane filaments recovered to 99% of the initial value.

Embodiment 3

[0018] The polypropylene hollow fiber microfiltration membrane device filters laboratory water with a turbidity of about 15NTU. When the flux of the polluted membrane drops to 20% of the initial value, the permeation flux of the membrane after cleaning can only recover to 20% of the initial value. 85% at the initial stage, and adopt the present invention, promptly adopt forward flushing (forward flushing flow rate is 2.3mL / s) to be full of membrane filament, after about 2sec, start recoil (recoil pressure is 1.5Mpa), forward recoil simultaneously After 18 sec, the flux of the fouled membrane filaments recovered to 99% of the initial value.

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Abstract

The invention relates to a method for washing membrane filter, wherein it wash reversely and clockwise to clean the membrane element; when the flux and quality of membrane element are reduced, it starts to wash; stops feeding material into membrane element; clockwise pump washes the membrane element to fill washing liquid into the membrane; starts the reverse pump; stops washing; repeats aforementioned process until the flux of fiber membrane or capillary membrane is recovered. The invention can completely wash out the pollutant in the membrane, with low water consumption.

Description

technical field [0001] The invention relates to a cleaning method of a membrane filtration device, that is, a method for cleaning a membrane module in a manner of simultaneous forward flushing and backflushing cleaning. Background technique [0002] Due to the characteristics of energy saving, environmental protection, simple equipment, and easy operation of membrane separation technology, the industry has developed rapidly and has been widely used. In particular, hollow fiber filtration membranes or capillary membranes are widely used due to their large filtration area per unit volume, low equipment manufacturing costs, and cross-flow filtration, which greatly prolongs the service life of the membranes. However, the problem of membrane fouling is the key issue for the wide application of this technology, and membrane cleaning is a common and important method to solve the problem of membrane fouling. Chemical cleaning needs to choose a suitable cleaning agent, and will prod...

Claims

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Application Information

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IPC IPC(8): B01D65/02
Inventor 郭晓燕
Owner NANKAI UNIV
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