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Method and system for detecting membrane pore blockage degree and pore diameter of water treatment porous membrane

A porous membrane and membrane pore technology, which is applied in radio wave measurement system, permeation/dialysis water/sewage treatment, geophysical measurement, etc., can solve the problem of hindering the long-term stable operation of membrane technology and improving separation efficiency, low test efficiency and cost performance, High purchase costs and other issues, to achieve the effects of saving testing costs, simplifying testing processes and operations, and saving time

Active Publication Date: 2020-03-27
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problem of membrane fouling has always been the main obstacle hindering the long-term stable operation of membrane technology and the improvement of separation efficiency, especially the blockage of membrane pores by pollutants, which leads to a sharp drop in water production.
However, the purchase cost of the above two instruments is relatively high (hundreds of thousands to millions), and the sample analysis takes a long time, usually at least 30 hours, and the test efficiency and cost performance are extremely low

Method used

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  • Method and system for detecting membrane pore blockage degree and pore diameter of water treatment porous membrane
  • Method and system for detecting membrane pore blockage degree and pore diameter of water treatment porous membrane
  • Method and system for detecting membrane pore blockage degree and pore diameter of water treatment porous membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The raw water used to refine high-quality sugar in the sugar workshop of a food factory was taken as the test water. The turbidity of the raw water was 915.2NTU, COD Mn It is 893.7mg / L, and the pH value is 8.3. The concentration of 3g / L and 8g / L was added ferric chloride as coagulant to carry out coagulation pretreatment of raw water. After adding the coagulant, stir quickly at 500rpm for 1min, then stir slowly at 50rpm for 15min, and after settling for 15min, take out 70% of the supernatant; use raw water and ferric chloride with a concentration of 3g / L as Coagulant-treated raw water supernatant, 8g / L ferric chloride as coagulant-treated raw water supernatant and pure water were respectively transferred to the ultrafiltration cup as the influent of the ultrafiltration membrane test. After the membrane filtration test, use a sponge to clean the mud cake layer on the surface of the ultrafiltration membrane, and then make circular membranes with a diameter of 1 cm to be ...

Embodiment 2

[0063] The raw water used to refine high-quality sugar in the sugar workshop of a food factory was taken as the test water. The turbidity of the raw water was 915.2NTU, COD Mn It is 893.7mg / L, and the pH value is 8.3. The concentration of 3g / L and 8g / L was added ferric chloride as coagulant to carry out coagulation pretreatment of raw water. After adding the coagulant, stir quickly at 500rpm for 1min, then stir slowly at 50rpm for 15min, and after settling for 15min, take out 70% of the supernatant; use raw water and ferric chloride with a concentration of 3g / L as Coagulant-treated raw water supernatant, 8g / L ferric chloride as coagulant-treated raw water supernatant and pure water were respectively transferred to the membrane filtration device as the influent of the nanofiltration membrane test. After the membrane filtration test, use a sponge to clean the mud cake layer on the surface of the nanofiltration membrane, and then make circular membranes with a diameter of 1 cm t...

Embodiment 3

[0066] Use 5 diaphragms with known apertures to fit into the detection cell slot, fill the detection cell with 0.1mol / L KCl electrolyte and fully infiltrate it for 20 minutes; For the voltage value, use the special software in the computer to record the corresponding current value synchronously, and obtain the first slope of the voltage-current regression line corresponding to the known aperture diaphragm; for the first slope of multiple voltage-current regression lines and the corresponding The known pore size of the porous membrane is subjected to linear regression analysis, and the following is obtained: Figure 4 The slope-aperture regression line plot is shown.

[0067] According to the slope-aperture regression line, such as Figure 4 As shown, it can be calculated that when the slope in Example 1 is 0.0002, the pore diameter of the polluted filter membrane is 0.0064 μm. According to the slope-aperture regression line, such as Figure 4 As shown, it can be calculated ...

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Abstract

The invention discloses a method and a system for detecting the membrane pore blockage degree and pore diameter of a water treatment porous membrane, relates to the technical field of water treatment,and aims to detect the membrane pore blockage degree of the porous membrane by applying different voltages to electrolytes on two sides of the membrane in order to solve the problem of porous membrane pollution caused by membrane pore blockage in the water treatment process. The method is convenient to operate and rapid in analysis, greatly reduces the equipment purchase cost, and can be used forpreparation, research and development of the porous membrane and membrane pollution test analysis in the membrane filtration process.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method and system for detecting clogging degree and pore diameter of a water treatment porous membrane. Background technique [0002] In recent years, membrane filtration technology has played an important role in my country's water treatment industry, involving water purification in the fields of drinking water, domestic sewage and industrial wastewater, among which porous membrane applications based on microfiltration, ultrafiltration and nanofiltration processes most widely. Common porous membranes range in size from 0.5nm to 10μm, and mainly use the principle of sieving to intercept pollutants in water to purify polluted water. However, the problem of membrane fouling has always been the main obstacle hindering the long-term stable operation of membrane technology and the improvement of separation efficiency, especially the blockage of membrane pores by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/02G01B7/13B01D65/10C02F1/44
CPCB01D65/10C02F1/44G01B7/13G01V3/02Y02A90/30
Inventor 俞文正苏兆阳王金强刘宏凯
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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