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A combined chemical cleaning method for removing membrane fouling and controlling by-product formation

A technology for chemical cleaning and by-products, applied in the field of membrane cleaning, can solve problems such as environmental pollution, and achieve the effect of reducing costs, moderate prices, and reducing the generation of toxic by-products

Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a strong oxidizing agent, hypochlorite not only undergoes oxidation reaction with organic matter, but also undergoes electrophilic substitution and addition reaction in the process of cleaning the inorganic, organic and biological pollution of the membrane, which can generate "three-effect" characteristic halogenated products, so there will be a large amount of halogenated toxic substances in the hypochlorite cleaning solution, such as trihalomethanes, haloacetic acids, etc.
At present, because this pollution problem has not attracted widespread attention, many hypochlorite cleaning solutions are directly discharged into natural water bodies after use, causing serious environmental pollution problems.

Method used

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  • A combined chemical cleaning method for removing membrane fouling and controlling by-product formation
  • A combined chemical cleaning method for removing membrane fouling and controlling by-product formation
  • A combined chemical cleaning method for removing membrane fouling and controlling by-product formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Put the polluted membrane module into a container containing persulfate cleaning solution, the persulfate used is sodium persulfate, the concentration of persulfate cleaning solution is 2.5mM, soaking time is 2h, and then put the membrane into In the container with sodium hypochlorite cleaning solution, the concentration of sodium hypochlorite is 2.5mM, and the soaking time is 2h. In order to confirm the effect, the membrane fouling was cleaned with sodium hypochlorite solution alone as a comparative experiment. The specific operation was to put the contaminated membrane module into a container filled with sodium hypochlorite cleaning solution, the concentration of sodium hypochlorite was 2.5mM, and the soaking time was 4h. The pH of persulfate cleaning solution and sodium hypochlorite solution is controlled at 8.0±0.1.

[0037] The polluted membrane module described in this test is the membrane module after filtering the humic acid solution.

[0038] The membrane modul...

Embodiment 3

[0050] Put the polluted membrane module into the container with sodium hypochlorite cleaning solution first, the concentration of sodium hypochlorite is 2.5mM, soaking time is 2h, then put the membrane into the container with persulfate cleaning solution, the persulfate used It is sodium persulfate, the concentration of persulfate cleaning solution is 2.5mM, and the soaking time is 2h. In order to confirm the effect, the membrane fouling was cleaned with sodium hypochlorite solution alone as a comparative experiment. The specific operation was to put the contaminated membrane module into a container filled with sodium hypochlorite cleaning solution, the concentration of sodium hypochlorite was 2.5mM, and the soaking time was 4h. The pH of persulfate cleaning solution and sodium hypochlorite solution is controlled at 8.0±0.1.

[0051] The polluted membrane module described in this test is the membrane module after filtering the humic acid solution.

[0052] The membrane module...

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PUM

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Abstract

The invention belongs to the field of membrane cleaning and more specifically relates to a combined chemical cleaning method for removing membrane pollution and controlling the generation of byproducts. A polluted membrane assembly is subjected to combined cleaning by adopting a persulfate oxidant and an oxidant containing hypochlorite; a specific method comprises the following steps: (1) firstly,immersing in a persulfate water solution; then immersing in a water solution of the oxidant containing the hypochlorite; or (2) firstly, immersing in the water solution of the oxidant containing thehypochlorite; then immersing the persulfate water solution. According to the combined chemical cleaning method provided by the invention, the polluted membrane assembly is subjected to the combined cleaning by adopting the persulfate oxidant and the oxidant containing the hypochlorite; compared with single hypochlorite cleaning, the recovery effect of membrane flux is equivalent or better; meanwhile, the generation of toxic side products can be effectively reduced; the combined chemical cleaning method has good environmental benefits and economic benefits.

Description

technical field [0001] The invention belongs to the field of membrane cleaning, and more specifically relates to a combined chemical cleaning method for removing membrane pollution and synchronously controlling by-product formation. Background technique [0002] Membrane separation technology, as a green, high-efficiency and energy-saving separation technology, is widely used in seawater desalination, drinking water purification, sewage and wastewater recycling and other fields. However, membrane fouling is a key issue that currently limits the large-scale application of membrane technology. During the membrane separation process, the pollutants in the water will adhere to the membrane surface, block the membrane pore size, increase the filtration resistance and reduce the filtration efficiency. At present, the commonly used methods for cleaning membrane pollution and restoring membrane flux mainly include physical cleaning and chemical cleaning. The common oxidants are pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/02
Inventor 谢鹏超丁家琪王宗平万颖王晶文邹瑜佳张立
Owner HUAZHONG UNIV OF SCI & TECH