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Method for controlling aging of ultrafiltration membrane by strengthening chemical cleaning through micro-nano bubble technology

A micro-nano bubble, chemical cleaning technology, applied in chemical instruments and methods, special treatment targets, water/sewage treatment, etc., can solve the problem of high cleaning costs for a single micro-nano bubble, achieve efficient control of membrane aging process, and prolong membrane use. Longevity and the effect of reducing usage

Active Publication Date: 2021-03-23
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that it can effectively restore the membrane flux to more than 90%, and will not cause secondary pollution. It provides a new idea for controlling membrane aging, but there are disadvantages such as high cost for single micro-nano bubble cleaning

Method used

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  • Method for controlling aging of ultrafiltration membrane by strengthening chemical cleaning through micro-nano bubble technology

Examples

Experimental program
Comparison scheme
Effect test

specific example 1

[0026] Process conditions:

[0027] Contaminated film: PVDF ultrafiltration membrane contaminated with anionic polyacrylamide;

[0028] Washing method: micro-nano-bubble + drug solution is soaked;

[0029] Cleaning temperature: 10 ° C;

[0030] Cleaning time: Each step is different;

[0031] Cleaning fluid formulation: Choose pure water as a solvent;

[0032] Suitable exposure to sodium hypochlorite chemical cleaning liquid: sodium hypochlorite is 0.03%, and the solution pH = 10 in hydrochloric acid is adjusted, and the soaking time is 120 min;

[0033] Micronine bubble technology: Air supply is gas source, control pressure at 0.4-0.5MPa, gas flow is 350-400 ml / min, the liquid environment is 20 ° C, the micro-nano bubble size range 850 nm-10 μm, the micronine bubble interface Zeta potential is -55mV;

[0034] Cleaning steps:

[0035] (1) Pure water spraying and backwashing of the contaminated film, the reversible contamination of the film surface is removed, and the flushing tim...

specific example 2

[0040] Process conditions:

[0041] Contaminated film: Ultrafiltration process Treatment of PVDF contaminated film in waste water;

[0042] Washing method: micro-nano-bubble + drug solution is soaked;

[0043] Cleaning temperature: 10 ° C;

[0044] Cleaning time: Each step is different;

[0045] Cleaning fluid formulation: Choose pure water as a solvent;

[0046] Suitable exposure of sodium hypochlorite chemical cleaning liquid: sodium hypochlorite is 0.01%, and the solution pH = 10 in hydrochloric acid is adjusted, and the soaking time is 30 min;

[0047] Dodecyl trimethyl ammonium chloride cleaning liquid: molar concentration is 2.0 cmc (CMC, the critical micellar concentration of the surfactant), pH = 7, soaking time is 40 min;

[0048] Micronine bubble technology: Take nitrogen as a gas source, control pressure at 0.4-0.5 MPa, gas flow is 450-500 mL / min, and the liquid environment is 10 ° C;

[0049] Cleaning steps:

[0050] (1) Pure water spraying and backwashing of the con...

specific example 3

[0057] Process conditions:

[0058] Contaminated film: contaminated film in the ultrafiltration process.

[0059] Washing method: micro-nano-bubble + drug solution is soaked;

[0060] Cleaning temperature: 10 ° C;

[0061] Cleaning time: Each step is different;

[0062] Cleaning fluid formulation: Choose pure water as a solvent;

[0063] Disodium ethylenediamine tetracetate cleaning liquid: concentration of 3.5 mmol / L, sodium bicarbonate regulates pH = 7, soaking time is 20 min;

[0064] Dodecyl trimethyl ammonium chloride cleaning liquid: molar concentration is 1.0 cmc, pH = 7, soaking time is 30 min;

[0065] Micronine bubble technology: Take pure oxygen as a gas source, control pressure at 0.4-0.5MPa, gas flow is 450-500 ml / min, and the liquid environment is 10 ° C;

[0066] Cleaning steps:

[0067] (1) Pure water spraying and backwashing of the contaminated film, the reversible contamination of the film surface is removed, and the flushing time is 15 min;

[0068] (2) Firs...

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Abstract

The invention relates to a method for controlling the aging of an ultrafiltration membrane by strengthening chemical cleaning through a micro-nano bubble technology. According to the invention, a contact area between a chemical cleaning agent and membrane pollutants is enhanced by using the characteristics of stability, large specific surface area, high mass transfer and the like of micro-nano bubble colloids; and meanwhile, active oxygen generated due to high interface charge and cavitation reacts with pollutants to facilitate desorption of organic pollutants. The invention mainly relates tothree steps, namely pure water spray washing and backwashing, cleaning of an ultrafiltration membrane by using an appropriate exposure-dose chemical cleaning agent enhanced by the micro-nano bubble technology, and pure water re-washing, wherein the cleaning time of each step is within the range of 10-180 minutes. According to the method, required membrane cleaning effect is achieved, and the initial performance of the membrane is recovered; compared with conventional chemical cleaning, a membrane flux recovery rate is increased by 0.5-2.6 times; and most importantly, the irreversible influenceof chemical agents on physical / chemical characteristics and filtering performance of the membrane in a conventional chemical cleaning process of the ultrafiltration membrane at present is effectivelyrelieved, the service life of the ultrafiltration membrane is prolonged and the aging process of the membrane is further controlled.

Description

Technical field [0001] The present invention relates to the field of ultrafiltration membrane aging control, and more particularly to micro-nano bubble techniques to strengthen ultrafiltration membrane chemical cleaning control ultrafiltration membrane aging. Background technique [0002] Since 1990, the ultrafiltration process based on the principle of membrane-based screening is widely used in the adaptability, the water quality, and the low cost is widely used in the reuse and drinking water depth processing of the wastewater. The raw water can be effectively removed. Bacteria, pathogens, colloids, macromolecular contaminants and even some viruses. However, during operation, the membrane contamination is severe and inevitable, causing the membrane flux and membrane properties to continuously attenuate, wherein the organic polymer is the main ultrafiltration membrane contaminant, which is widely distributed in various water, such as water containing algae organic matter. , The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44
CPCC02F1/444C02F2303/14C02F2201/002Y02W10/10
Inventor 刘贵彩张梦迪赵东升朱友兵孙绍芳谢康邱立平厉鹏远
Owner UNIV OF JINAN
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