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Preparation method of high-performance MABR hollow fiber composite membrane

A fiber composite, high-performance technology, applied in the field of membrane separation, can solve the problems of easy blockage of microporous membrane pore structure by microorganisms, poor selectivity of hydrophobic microporous membrane, large gas transmission resistance, etc., to achieve good application prospects, modification Good effect and ensure the effect of operating efficiency

Active Publication Date: 2020-08-04
ZHEJIANG CHANGXING CREFLUX MEMBRANE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Hydrophobic microporous membranes have poor selectivity to oxygen and low bubble point pressure, and during long-term operation, the microporous membrane pore structure is easily blocked by microorganisms, resulting in a decrease in operating efficiency
Although the dense film has a high bubble point pressure, due to its dense structure, the gas transmission resistance is relatively large

Method used

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  • Preparation method of high-performance MABR hollow fiber composite membrane
  • Preparation method of high-performance MABR hollow fiber composite membrane
  • Preparation method of high-performance MABR hollow fiber composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing a high-performance MABR hollow fiber composite membrane, comprising the steps of:

[0029] 1) Pretreatment base membrane: The base membrane is a hydrophobic microporous membrane, and the membrane material is polyethylene (PE). The inner diameter of the PE base membrane is 300 μm, the wall thickness is 80 μm, and the surface pore size of the membrane is 0.3 μm.

[0030] Soak the base film in ethanol for 5 minutes, soak the base film in water twice for 10 minutes each time, and then use compressed air to remove the residual water on the surface of the PE base film.

[0031] 2) Prepare the coating solution: vinyl silicone oil is used for raw silicone rubber, white carbon black is used for reinforcing material, hydrogen-containing silicone oil is used for crosslinking agent, castor catalyst is used for catalyst, n-hexane is used for diluting solvent; 1 part of vinyl silicone oil , 0.05 parts of white carbon black, and continue to stir for 60 minutes, ...

Embodiment 2

[0041] A method for preparing a high-performance MABR hollow fiber composite membrane, comprising the steps of:

[0042] 1) Pretreatment base membrane: The base membrane is a hydrophobic microporous membrane, and the membrane material is polypropylene (PP). The inner diameter of the PP base membrane is 400 μm, the wall thickness is 100 μm, and the surface pore size of the membrane is 0.3 μm.

[0043] Soak the base film in ethanol for 4 minutes, soak the base film 5 times with water, 10 minutes each time, and then use compressed air to remove the residual water on the surface of the PP base film.

[0044]2) Prepare the coating solution: vinyl silicone oil is used for raw silicone rubber, nano-calcium carbonate is used for reinforcing materials, hydrogen-containing silicone oil is used for crosslinking agent, castor catalyst is used for catalyst, n-hexane is used for diluting solvent; 1 part of vinyl silicone oil , 0.05 parts of nano-calcium carbonate, stirring continuously for ...

Embodiment 3

[0053] A method for preparing a high-performance MABR hollow fiber composite membrane, comprising the steps of:

[0054] 1) Pretreatment base membrane: The base membrane is a hydrophobic microporous membrane, and the membrane material is polyvinylidene fluoride (PVDF). The inner diameter of the PVDF base membrane is 500 μm, the wall thickness is 100 μm, and the surface pore size of the membrane is 0.1 μm.

[0055] Soak the PVDF base film in ethanol for 3 minutes, soak the base film with water for 3 times, 5 minutes each time, and then use compressed air to remove the remaining water on the surface of the PVDF base film.

[0056] 2) Prepare the coating solution: vinyl silicone oil is used for raw silicone rubber, white carbon black is used for reinforcing materials, hydrogen-containing silicone oil is used for crosslinking agent, castor catalyst is used for catalyst, petroleum ether is used for dilution solvent; 1 part of vinyl silicone oil , 0.5 parts of white carbon black, an...

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Abstract

The invention relates to the technical field of membrane separation, and particularly relates to and discloses a preparation method of a high-performance MABR hollow fiber composite membrane, which comprises the following steps: 1) pretreating a base membrane: soaking the base membrane in ethanol, soaking in clear water, and removing residual water; 2) preparing a coating solution, namely mixing raw silicone rubber and a reinforcing material, continuously stirring, adding a cross-linking agent and a catalyst, fully stirring, adding a solvent, diluting to the required concentration, and defoaming in vacuum; 3) coating the pretreated base film: coating and pulling; and (4) curing, namely curing in a drying oven. The invention discloses the preparation method of the high-performance MABR hollow fiber composite membrane. The prepared composite membrane has higher oxygen permeability and dry membrane bubble point pressure, is beneficial to oxygen transmembrane transmission, can bear higheraeration pressure in the operation process, can ensure the operation efficiency of an MABR system, and has the advantages of simple and feasible process, suitability for microporous support membranesof various materials and good modification effect.

Description

technical field [0001] The invention relates to the technical field of membrane separation, in particular to a method for preparing a high-performance MABR hollow fiber composite membrane. Background technique [0002] Membrane Aeration Biofilm Reactor (MABR) is an emerging technology for wastewater treatment and a new form of membrane bioreactor. MABR is based on a gas-permeable membrane through which a gaseous substrate is provided to a biofilm formed on the outside of the membrane. Oxygen and pollutants enter the biofilm from both sides of the biofilm respectively, which makes the microorganisms in the MABR biofilm have a unique colony structure, and microorganisms in different layers have different pollutant treatment capabilities. The main advantages of MABR include high gas utilization efficiency, low energy consumption and small reactor footprint. MABR has great technical advantages and broad application prospects in strengthening the degradation of organic wastewat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D69/12C02F3/10B01D71/70
CPCB01D69/125Y02W10/10
Inventor 吴昊沈红梅黄赋徐志鹏徐山田曹利民包进锋
Owner ZHEJIANG CHANGXING CREFLUX MEMBRANE TECH CO LTD