A method and device for measuring the diffusion coefficient of cleaning agent in membrane fouling layer

A diffusion coefficient and cleaning agent technology, which is applied in the field of water treatment, can solve the problems of difficult quantitative monitoring of the cleaning agent diffusion process and the inability to accurately describe the change of cleaning agent diffusion, and achieve short measurement time, good practicability, and low cost of use Effect

Active Publication Date: 2020-01-10
TONGJI UNIV
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Problems solved by technology

However, there are few studies on the influence of the cleaning agent diffusion process in the membrane fouling layer on the cleaning mechanism.
The reason is that it is difficult to quantitatively monitor the diffusion process of cleaning agents, and it is impossible to accurately describe the changes in the diffusion of cleaning agents in the contaminated layer under different conditions.
And there is not yet an effective method for measuring the diffusion coefficient of cleaning agents in the contaminated layer.

Method used

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  • A method and device for measuring the diffusion coefficient of cleaning agent in membrane fouling layer
  • A method and device for measuring the diffusion coefficient of cleaning agent in membrane fouling layer
  • A method and device for measuring the diffusion coefficient of cleaning agent in membrane fouling layer

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Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: use respectively the bovine serum albumin (BSA) solution and sodium alginate (SA) that concentration is 1g / L to pollute ultrafiltration membrane, and measure total available chlorine concentration and be 100mg / L, pH be respectively 5 and 11 Diffusion coefficient of NaClO cleaning agent in two kinds of contamination layers. First, use a micrometer to measure the thickness of the polluted membrane fouling layer. The average thickness of the BSA fouling layer is 210 μm, and the thickness of the SA fouling layer is 213 μm. Use starch potassium iodide test paper as the color test paper. According to the above operation method, fix the membrane on the osmosis device and add cleaning agent so that the water head on one side of the U-shaped tube is 0.5cm higher than the membrane surface, and use a stopwatch to time. After repeating the above experiment three times, it was found that in the BSA pollution layer, the average diffusion time of the cleaning agent with ...

Embodiment 2

[0044] Embodiment 2: on the basis of the experiment described in embodiment 1, add the sodium dodecyl sulfate (SDS) of 0.5mmol / L in cleaning agent to further improve the diffusion rate of cleaning agent, and repeat above-mentioned diffusion coefficient determination experiment . Use NaClO cleaning agent with a total available chlorine concentration of 100mg / L, an SDS concentration of 0.5mmol / L, and a pH of 5 and 11, respectively, to measure its diffusion process in the two pollution layers of BSA and SA, record the diffusion time and follow the test The diffusion coefficient calculation formula derived in the method was used to calculate the diffusion coefficient. The measurement results show that: in the BSA pollution layer, the diffusion coefficient of the cleaning agent at pH=5 after adding SDS is 7.68×10 - 8 cm / s is significantly greater than 4.99×10 without adding SDS -8 cm / s; the diffusion coefficient of the cleaning agent with pH=11 is 14.3×10 - 8 cm / s is significa...

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Abstract

The invention aims at technology related to membrane separation technology used in sewage treatment, relates to a method and apparatus for measuring the diffusion coefficient of a cleaning agent in amembrane pollution layer, and belongs to the technical field of water treatment. The method comprises: measuring the thickness of a membrane-face pollution layer with a micrometer; downward fixing themembrane-face pollution layer on a measuring device; covering an upper surface (back side) of a membrane with chromogenic test paper used for marking the diffusion terminal point of a cleaning agent;injecting the cleaning agent to the apparatus till the cleaning agent reaches a preset scale and performing timing; and stopping timing till the color of the test paper is totally changed, and calculating the diffusion coefficient according to a diffusion model of the cleaning agent in the membrane pollution layer. According to the method, a diffusion model of a cleaning agent in a membrane pollution layer is established, so that quantitative monitoring of a cleaning agent diffusion process under a pressure in an experimental scale is achieved. The method is short in measuring time, high in repeatability, convenient to operate, and low in application cost, and provides efficient support to research of a cleaning agent diffusion mechanism in a chemical cleaning process.

Description

technical field [0001] The invention relates to the technical field of water treatment, and is aimed at processes related to membrane separation technology used in sewage treatment, in particular to a method and a device for measuring the diffusion coefficient of a cleaning agent in a membrane fouling layer. Background technique [0002] Membrane separation technology (such as microfiltration, ultrafiltration, nanofiltration, reverse osmosis, etc.) and membrane bioreactor technology have been widely used in the field of water treatment technology. However, problems such as the decrease of membrane flux and shortened service life caused by membrane fouling have become important factors restricting the application of membrane technology. Therefore, in order to restore the membrane flux and prolong the service life of the membrane, the membrane cleaning process has become an indispensable and important measure in the application process of membrane technology. Membrane cleanin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/00
Inventor 王志伟王雪野张星冉王巧英吴志超
Owner TONGJI UNIV
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