Method for carrying out hollow fiber membrane surface hydrophilic modification by using biological agent

A biological agent and hydrophilic modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as difficult cleaning, membrane flux attenuation, etc., and achieve simple operation, easy industrial production, and water quality Safe and reliable effect

Inactive Publication Date: 2013-02-06
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since most of the membrane materials currently on the market are hydrophobic substances such as PDVF and PES, when treating oily wastewater or emulsion wastewater, the flux of the membrane is often attenuated and it is difficult to clean.

Method used

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  • Method for carrying out hollow fiber membrane surface hydrophilic modification by using biological agent
  • Method for carrying out hollow fiber membrane surface hydrophilic modification by using biological agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] will be 50m 2 PVDF hollow fiber membrane, the surface membrane pore size is 0.2μm, soaked in isopropanol for 0.5 hours. Take it out and soak it in pure water for 24 hours to complete the soaking treatment;

[0029] Preparation of dopamine solution: First, mix 10 liters of 0.1 mol / L tris-hydroxymethylaminomethane (Tris) solution with 1.7 liters of 0.1 mol / L hydrochloric acid and dilute to 20 liters. Add sodium hydroxide solution with pH=13 to adjust the pH to 8.8, and add chemically pure dopamine hydrochloride powder at a concentration of 10 g / L. Both ends of the hollow fiber membrane must be placed out of the solution, aerated and stirred with air, reacted for 2 hours, and the surface of the membrane turned brown.

[0030] After the membrane is taken out, rinse it with clean water, soak it in ethanol for 20 minutes, then take it out, rinse it with a 0.02% sodium azide solution, and pack it tightly.

Embodiment 2

[0032] will be 10m 2 PES hollow fiber ultrafiltration membrane with a cut molecular weight of 50,000, soaked in isopropanol for 2 hours. Take it out and immerse it in pure water for 12 hours to complete the infiltration treatment;

[0033] Preparation of dopamine solution: First, mix 5 liters of 0.1 mol / L tris-hydroxymethylaminomethane (Tris) solution with 0.85 liters of 0.1 mol / L hydrochloric acid and dilute to 10 liters. Add 0.1 mol / L sodium hydroxide solution to adjust the pH to 8.8, and add chemically pure dopamine hydrochloride powder at a concentration of 5 g / L. Both ends of the hollow fiber membrane must be placed out of the solution, aerated and stirred with air, reacted for 0.5 hours, and the surface of the membrane turns brown.

[0034] After the membrane is taken out, rinse it with clean water, soak it in ethanol for 30 minutes, take it out again, rinse it with a 0.02% sodium azide solution, and pack it tightly.

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Abstract

The invention relates to a method for carrying out hollow fiber membrane surface hydrophilic modification by using a biological agent, comprising the steps of (1) immersing a hollow fiber membrane in isopropanol and pure water to finish wetting treatment; (2) adding dopamine powder into a buffering solution to prepare a dopamine solution; (3) immersing the immersed hollow fiber membrane into the dopamine solution; placing the two ends of the hollow fiber membrane out of the solution and utilizing air to carry out aeration and agitating reaction; and then washing to be clean, and sealing and packaging. The method only coats and modifies on the membrane surface and does not change the structure of the membrane; the operation is simple, and the industrialized production is easy to realize; the prepared hollow fiber membrane is anti-ageing, chemical-washing-resisting and high-temperature-resisting; the hollow fiber membrane can be prepared into a curtain type or pipe type membrane assembly and can be applied to the treatment of oily wastewater and emulsified liquid wastewater; and the effluent quality of membrane filtering is safety and reliable and the water quality requirement of the reuse of reclaimed water is achieved.

Description

technical field [0001] The invention belongs to the field of membrane material modification methods, in particular to a method for hydrophilic modification of the surface of hollow fiber membranes by using biological agents. Background technique [0002] As an efficient sewage treatment technology, membrane separation technology has the advantages of good treatment effect, stable effluent quality, simple equipment, small footprint and convenient operation. Hollow fiber membranes have gradually become microfiltration membranes due to their simple manufacturing process and low cost. Compared with the mainstream of ultrafiltration membranes, microfiltration / ultrafiltration hollow fiber membrane effluent can meet the current and future requirements for sewage discharge standards. At present, when waste water resources become a trend and sewage discharge standards are becoming more and more stringent, it is undoubtedly extremely strong. development potential and market prospects....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
Inventor 李方杨林明黄礼超朱云锋潘婷李勇汪帅
Owner DONGHUA UNIV
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