Method and device for detecting integrity of composite reverse osmosis membrane desalting layer

A technology of reverse osmosis membrane and reverse osmosis membrane module, which is applied in the field of reverse osmosis membrane integrity detection, can solve the problems of no detection device and method, and few evaluation methods of reverse osmosis membrane.

Active Publication Date: 2015-03-11
VONTRON TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, domestic reverse osmosis membrane technology lags behind developed countries, and there are few evaluation methods for reverse osmosis membranes. The main detection methods are the basic performance test methods such as flux and desalination rate of reverse osmosis membranes, and there is no specific UF layer, desalination layer, etc. Related detection device and method

Method used

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  • Method and device for detecting integrity of composite reverse osmosis membrane desalting layer
  • Method and device for detecting integrity of composite reverse osmosis membrane desalting layer
  • Method and device for detecting integrity of composite reverse osmosis membrane desalting layer

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Embodiment 1

[0028] Such as figure 1 As shown, a method for detecting the integrity of the desalination layer of the composite reverse osmosis membrane comprises the following steps:

[0029] (1) Preparation of test solution: Take water and sodium chloride to prepare a concentration of 245-33000mg / l, then add rhodamine B to it, and use a stirring speed of 350r / min to stir and mix evenly, and control rhodamine B After the concentration of Rhodamine B in the solution is 200ppm, the test solution is obtained, and it is placed in the test solution tank 1, and the pH value is adjusted to 7.45-7.55 for use;

[0030] (2) Membrane installation: the membrane 5 to be tested is installed in the evaluation tank 6, so that the desalination layer of the membrane faces the water inlet of the evaluation tank 6, and is ready for use;

[0031] (3) Pressurized dyeing: turn on the booster pump 2, adjust the stop valve 3 so that the test pressure is 0.39-5.55MPa, and control the temperature to 24.5-25.5°C, ma...

Embodiment 2

[0042] Such as figure 1 As shown, a method for detecting the integrity of the desalination layer of the composite reverse osmosis membrane comprises the following steps:

[0043] (1) Preparation of test solution: Take water and sodium chloride to prepare a concentration of 245-33000mg / l, then add rhodamine B to it, and use a stirring speed of 400r / min to stir and mix evenly, and control rhodamine B Add-on amount, after making the concentration of rhodamine B in solution be 210ppm, obtain test solution, and it is placed in test solution tank 1, adjust pH value to be 7.45-7.55, stand-by;

[0044] (2) Membrane installation: the membrane 5 to be tested is installed in the evaluation tank 6, so that the desalination layer of the membrane faces the water inlet of the evaluation tank 6, and is ready for use;

[0045] (3) Pressurized dyeing: Turn on the booster pump 2, adjust the stop valve 3 so that the test pressure is 0.39-5.55MPa, and control the temperature to 24.5-25.5°C, maintai...

Embodiment 3

[0055] Such as figure 1 As shown, a method for detecting the integrity of the desalination layer of the composite reverse osmosis membrane comprises the following steps:

[0056] (1) Preparation of test solution: Take water and sodium chloride to prepare a concentration of 245-33000mg / l, then add rhodamine B to it, and use a stirring speed of 300r / min to stir and mix evenly, and control rhodamine B After the concentration of Rhodamine B in the solution is 190ppm, the test solution is obtained, and it is placed in the test solution tank 1, and the pH value is adjusted to 7.45-7.55 for use;

[0057] (2) Membrane installation: the membrane 5 to be tested is installed in the evaluation tank 6, so that the desalination layer of the membrane faces the water inlet of the evaluation tank 6, and is ready for use;

[0058] (3) Pressure dyeing: Turn on the booster pump 2, adjust the stop valve 3 so that the test pressure is 0.39-5.55MPa, and control the temperature to 24.5-25.5°C, maint...

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Abstract

The invention relates to the technical field of detection of integrity of a reverse osmosis membrane, in particular to a method and device for detecting the integrity of a composite reverse osmosis membrane desalting layer which can be realized in a manner that Rhodamine B, taken as a dye, is added into a saline solution to be prepared into staining fluid with a certain concentration. With the adoption of the device provided by the invention, the following steps are contained: a reverse osmosis membrane filtration principle is applied to the field of staining examine, the staining fluid is subjected to water filtration treatment and the dye is applied to a reverse osmosis membrane desalting layer, the dyed reverse osmosis membrane desalting layer is washed in clean water until that the discharged concentrated water is colorless, the reverse osmosis membrane desalting layer is then taken out for microscopic determination, if red dots or lines occur, that detects exist is indicated, so that accurately positioned evaluation on defect situation of the reverse osmosis membrane is realized, conventional detection on permeability and desalinization ratio of the reverse osmosis membrane desalting layer is not needed in the detection method, while a more concrete detection on UF layer and the desalting layer is realized, the accuracy rate of the detection is increased.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membrane integrity detection, in particular to a method for detecting the integrity of a desalination layer of a composite reverse osmosis membrane and a detection device thereof. Background technique [0002] Reverse osmosis technology (Reverse Osmosis membrane, RO) is the most advanced and most energy-efficient membrane separation technology today. The principle is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of higher than the osmotic pressure of the solution. Since the membrane pore size of the reverse osmosis membrane is very small (only about 10A), it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water (the removal rate is as high as 97%-98%). Reverse osmosis is currently the most widely used desalination technology in high-purity water equi...

Claims

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Application Information

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IPC IPC(8): B01D65/10
Inventor 王思亮梁松苗蔡志奇吴宗策黄纪湘
Owner VONTRON TECH CO LTD
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