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Multifunctional ultrafiltration membrane, and preparation method and application thereof

An ultrafiltration membrane, a multi-functional technology, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problems of decreased membrane flux, membrane structure damage, and reduced membrane service life.

Pending Publication Date: 2021-09-10
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems are faced: 1) the agglomeration of inorganic particles causes defects in the membrane structure, which limits the further improvement of the performance of ultrafiltration membranes; 2) the retention rate of small molecules such as dyes is not ideal; 3) membrane fouling, microorganisms are adsorbed in Rapid growth and reproduction in the membrane and on the surface of the membrane, resulting in a decrease in the membrane flux, requires frequent backwashing to restore the flux, which can easily damage the structure of the membrane and reduce the service life of the membrane

Method used

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  • Multifunctional ultrafiltration membrane, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The invention provides a preparation method of a multifunctional ultrafiltration membrane, comprising:

[0028] (1) The pyrolysis experiment was carried out in a tubular pyrolysis furnace. Take 2 grams of wood chips and aluminum slag and mix them evenly in a ratio of 1:1, put them in a quartz boat, and use a push rod to put the quartz boat into a 60mm diameter In the quartz tube reactor, the quartz tube reactor is placed in a suitable position of the pyrolysis furnace so that the quartz boat is in the constant temperature heating zone, and nitrogen gas is introduced as a protective gas. Rise to the specified temperature (700°C) in a tubular pyrolysis furnace at a rate of 10°C for 30 minutes, then cool to room temperature, take out the biochar after complete cooling, and transfer it to a plastic bag for storage.

[0029] (2) Grind the biochar material to 600 mesh in a ball mill for later use. The polysulfone was dried in a vacuum oven for 10 h, and 18 g of dry polysulfo...

Embodiment 2

[0033] The biochar preparation method is the same as in Example 1.

[0034] The polyethersulfone was dried in a vacuum oven for 10 h, and 18 g of dry polyethersulfone, 1.5 g of biochar material, and 0.5 g of polyethylene glycol were dissolved in 80 g of organic solvent N,N-2-methylacetamide. Ultrasound for 1-3 hours, and dissolve with magnetic stirring at a temperature of 60°C until the casting solution is transparent gray-black, then let stand to remove bubbles. Using the phase inversion method, the above-mentioned cast film liquid phase is transformed into a film.

[0035] The prepared multifunctional ultrafiltration membrane was installed in a pressure filtration experimental device to test the removal rate of dyes. Taking methyl orange as an example, the removal rate of polyethersulfone membrane to methyl orange was 2 .

[0036] The sewage treatment test method is the same as in Example 1. Influent COD is 377.5, ammonia nitrogen is 28.06, COD and ammonia nitrogen are red...

Embodiment 3

[0038] The biochar preparation method is the same as in Example 1.

[0039] The polyvinylidene fluoride was dried in a vacuum oven for 10 h, and 15.0 g of dry polyvinylidene fluoride, 2.0 g of biochar material, and 1.0 g of polymethyl methacrylate were dissolved in 82.0 g of organic solvent nitrogen methyl pyrrolidone. Ultrasound for 1-3 hours, stir and dissolve at 50°C with magnetic force until the casting solution is transparent gray-black, then let stand to defoam. Using the phase inversion method, the above-mentioned cast film liquid phase is transformed into a film.

[0040] The prepared multifunctional ultrafiltration membrane was installed in a pressure filtration experimental device to test the removal rate of dyes. Taking methyl orange as an example, the removal rate of pure polyvinylidene fluoride membrane to methyl orange was 2 .

[0041] The sewage treatment test method is the same as that in Example 1. Influent COD is 377.5, ammonia nitrogen is 28.06, COD and am...

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Abstract

The invention discloses a multifunctional ultrafiltration membrane, and a preparation method and application thereof. The preparation method comprises the following steps: performingco-pyrolysis on metallurgical waste residues and biomass to prepare a metal particle loaded biochar material; grinding the metal particle loaded biochar material, adding the ground metal particle loaded biochar material, a polymer and an additive into an organic solvent, and carrying out stirring ultrasonic treatment to form a uniform membrane casting solution; and carrying out phase conversion on the membrane casting solution to form a membrane by using a phase conversion method. The acting force between the biochar and a polymer molecular chain is enhanced, so that the agglomeration of biochar particles is inhibited. Compared with a common polysulfone membrane, the multifunctional ultrafiltration membrane prepared by the preparation method disclosed by the invention is low in cost, the membrane performance is improved, the removal of dye micromolecules by the membrane is enhanced, the membrane pollution is reduced, and the service life of the membrane is prolonged.

Description

technical field [0001] The invention relates to a multifunctional ultrafiltration membrane and its preparation method and application, belonging to the technical field of sewage treatment. Background technique [0002] Membrane bioreactor (MBR) has become one of the most popular wastewater treatment technologies today. It integrates the biodegradation of pollutants and the membrane separation of microorganisms. The main advantages of MBR are small footprint, low concentration of pollutant discharge, stable operation and good water quality. [0003] Membranes are the core of MBR water treatment. Nowadays, the types of MBR membranes are mainly ultrafiltration and microfiltration membranes. In order to ensure the cost performance, the choice of polymer material formulations is limited. Most of the membrane materials are polyvinylidene fluoride and polysulfone. In order to improve the performance of membranes, membrane scientists have carried out a lot of research. Through surf...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D69/02B01D71/34B01D71/68B01D61/14C02F3/12C02F101/20
CPCB01D67/0079B01D69/02B01D61/145B01D71/022B01D71/021B01D71/68B01D71/34C02F3/1268B01D2325/12C02F2101/20Y02W10/10
Inventor 周政忠徐莉莉许鑫悦刘莉刘鹏呼和涛力
Owner CHANGZHOU UNIV
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