Method evaluating membrane chemical cleaning recovery performance

A chemical cleaning and performance technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the time-consuming and labor-intensive problems of cleaning chemicals, and achieve the effect of low cost and simple operation

Inactive Publication Date: 2012-07-18
TORAY FIBER RES INST(CHINA) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the time-consuming and labor-intensive problem of judging the recovery performance of MBR membrane chemical cleaning and the selection of cleaning agents under the existing

Method used

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  • Method evaluating membrane chemical cleaning recovery performance
  • Method evaluating membrane chemical cleaning recovery performance
  • Method evaluating membrane chemical cleaning recovery performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The test sludge is sludge from a papermaking wastewater treatment plant, and the sludge concentration is 2000mg / L. Firstly, the flux J1 of the membrane in pure water was measured to be 9.39m / d 5KPa, and the initial membrane resistance R1 of the membrane was calculated by Darcy's law; the membrane was washed with pure water after repeating the sludge filtration test 20 times, and the measured The flux J2 of the membrane in pure water is 0.84m / d 5KPa, and the membrane resistance R2 of the membrane after contamination is calculated by Darcy's law; the membrane is taken out and immersed in an oxalic acid solution with a concentration of 1000mg / L for 20h , the flux J3 of the membrane in pure water measured after chemical cleaning is 6.35m / d 5KPa, and the membrane resistance R3 of the membrane after chemical cleaning is calculated by Darcy's law. The test data are shown in Table 1. By calculating It is known that the chemical cleaning recovery rate of the membrane is (R2-R3) / ...

Embodiment 2

[0046] The test sludge is sludge from a printing and dyeing wastewater treatment plant, and the sludge concentration is 3000mg / L. First, the flux J1 of the membrane in pure water is measured to be 9.00m / d 5KPa, and the flux of the membrane is calculated by Darcy's law. Initial membrane resistance R1; after repeating the sludge filtration test 20 times, the membrane was washed with pure water, and the flux J2 of the membrane in pure water was measured to be 0.93m / d 5KPa, and the membrane flux after pollution was calculated by Darcy's law Membrane resistance R2, the diaphragm is taken out and immersed in a sodium hypochlorite solution of 1000mg / L in terms of available chlorine concentration for 10h. After chemical cleaning, the flux J3 of the diaphragm in pure water is measured to be 3.13m / d 5KPa. The law calculates the membrane resistance R3 of the membrane after chemical cleaning, and the test data is shown in Table 3. The recovery rate of the membrane chemical cleaning of the ...

Embodiment 3

[0058] The test sludge is sludge from a landfill leachate treatment plant, and the sludge concentration is 2000mg / L. First, the flux J1 of the membrane in pure water is measured to be 9.39m / d 5KPa, and the membrane is calculated by Darcy's law After repeating the sludge filtration test 15 times, the membrane was washed with pure water, and the flux J2 of the membrane in pure water was measured to be 0.57m / d 5KPa. Calculated by Darcy's law, the Membrane resistance R2, the diaphragm is taken out, first soaked in the sodium hypochlorite solution of 600mg / L in terms of available chlorine concentration for 20h, after chemical cleaning, the flux J3 of the diaphragm in pure water is measured to be 1.05m / d 5KPa, passed The membrane resistance R3 of the membrane after chemical cleaning is calculated by Darcy's law, and the test data are shown in Table 7. The recovery rate of membrane chemical cleaning of the membrane is (R2-R3) / (R2-R1)*100%=48.7% . Then soak in 2000mg / L citric acid so...

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Abstract

The invention discloses a method for evaluating membrane bioreactor (MBR) membrane chemical cleaning recovery performance, which comprises the steps of arranging a stirring type ultrafiltering cup on a magnetic stirrer, connecting the stirring type ultrafiltering cup with a sealed container, connecting the sealed container with a pressure reduction regulation valve, connecting the pressure reduction regulation valve with a nitrogen steel bottle, installing a pressure meter on an air outlet of the pressure reduction regulation valve, connecting a water outlet of the stirring type ultrafiltering cup with a balance, and connecting the balance with a computer. A small evaluation device is used for evaluating initial membrane resistance R1 of a membrane, membrane resistance R2 after the membrane is polluted and membrane resistance R3 after the membrane is chemically cleaned, and then the chemical cleaning recovery performance of the membrane which is cleaned on chemical conditions is judged after slurry is filtered. The method is simple in operation, low in cost and capable of quickly judging membrane chemical cleaning recovery performance, choosing appropriate chemical cleaning chemicals and confirming optimized cleaning schemes.

Description

technical field [0001] The invention belongs to the technical field of membranes, and in particular relates to a method for evaluating the chemical cleaning recovery performance of membranes. Background technique [0002] As a new type of separation technology, membrane technology has been widely used in wastewater treatment and has shown broad development prospects. It has been promoted more and more in recent years. Membrane bioreactor (MBR) is a new type of water treatment technology that combines a membrane separation unit with a biological treatment unit. The secondary settling tank is replaced by a membrane module, which can maintain a high concentration of active sludge in the bioreactor and reduce sewage treatment. facility footprint and reduce sludge production by keeping sludge loads low. Compared with the traditional biochemical water treatment technology, the membrane bioreactor has the following main characteristics: high treatment efficiency, good effluent qua...

Claims

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Application Information

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IPC IPC(8): B01D65/10B01D65/06
Inventor 田陆梅黄圣散杨瑜芳
Owner TORAY FIBER RES INST(CHINA) CO LTD
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