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On-line detection method and sampling device for membrane elements of nanofiltration or reverse osmosis membrane unit

A technology of reverse osmosis membrane and detection method, which is applied in the field of online detection method and sampling device of membrane element of nanofiltration or reverse osmosis membrane unit, can solve problems such as low efficiency and increased maintenance cost, and achieve reduced investment, low detection cost, Strong referential effect

Active Publication Date: 2022-06-21
HUNAN JUNXIN ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it is impossible to distinguish which membrane element in the membrane shell is faulty, in order to restore the water production of the whole unit, 6 membrane elements have to be replaced at the same time, or 6 membrane elements have to be returned to the factory for single inspection, which will increase the maintenance cost of the membrane. low efficiency

Method used

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  • On-line detection method and sampling device for membrane elements of nanofiltration or reverse osmosis membrane unit
  • On-line detection method and sampling device for membrane elements of nanofiltration or reverse osmosis membrane unit
  • On-line detection method and sampling device for membrane elements of nanofiltration or reverse osmosis membrane unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Example 1: COD is selected as the judgment index. It can be seen from the test data that 18 mg / L is the minimum value of water produced by all membrane elements 32, and is lower than the GB16889-2008 emission standard, so the second membrane element 32 is selected as the reference membrane element. . Through calculation, the COD value of the water produced by the first membrane element 32 is 8.77 times the COD value of the water produced by the reference membrane element, which is greater than 0.83 times; the fourth membrane element is 322.11 times, which is greater than 1.44; The COD exceeds the GB16889-2008 discharge standard, and the COD of the fourth membrane produced water does not exceed the GB16889-2008 discharge standard, so only the first membrane element 32 needs to be replaced to resume normal operation.

Embodiment 2

[0055] Example 2: TDS is selected as the judgment index. It can be seen from the test data that 231 mg / L is the minimum value of water produced by all membranes. Therefore, the first membrane element 32 is selected as the reference membrane element. Through calculation, the fourth membrane element 32 produces water. The TDS value is 1.84 times the COD value of the water produced by the benchmark membrane element, and is greater than 1.23=1.728 times; according to the condition 2, the COD value of the produced water is 121mg / L, which exceeds the GB16889-2008 discharge standard and needs to be replaced.

Embodiment 3

[0056] Example 3: Conductivity is selected as the judgment index. From the test data, 458 us / cm is the minimum value of water produced by all membrane elements 32. Therefore, the first membrane element 32 is selected as the reference membrane element. Through calculation, all membrane elements 32 Judgment condition 1 for water production review, all membrane elements 32 are in good condition and do not need to be replaced.

[0057] like figure 2 and image 3 As shown in the figure, the present invention also discloses an on-line sampling device 4 for membrane element water production of a nanofiltration or reverse osmosis membrane unit, which is used to realize the production water sampling operation in the above method. The specific structure includes a probe tube 41, a probe tube 41 One end of the probe tube 41 is provided with a water intake end 44 , and the other end of the probe tube 41 is provided with a water outlet end 45 . One end of the probe tube 41 is bent by 90...

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Abstract

The invention discloses an online detection method for membrane elements of a nanofiltration or reverse osmosis membrane unit, comprising: S01, sampling the water produced by each membrane element when the nanofiltration or reverse osmosis membrane unit is running; S02, sampling the water produced by each membrane element The detection index of the water produced by the membrane element is detected; S03, compare the actual detection value of each membrane element with the preset standard value, select the actual detection value closest to the standard value as the reference detection value, and the membrane element corresponding to the reference detection value is the reference membrane element; S04, compare the actual detection values ​​corresponding to other membrane elements with the reference detection values ​​to determine whether the rejection performance of the corresponding membrane element has declined. The invention also discloses an online sampling device for membrane element water production of a nanofiltration or reverse osmosis membrane unit, including a probe tube, one end of the probe tube is provided with a water intake end, the other end of the probe tube is provided with a water outlet end, and the probe tube is provided with a Has sealed fasteners. Both the method and the device of the invention have the advantages of simple and convenient operation, low equipment maintenance cost, improved service life of the membrane, and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to an on-line detection method and a sampling device for membrane elements of a nanofiltration or reverse osmosis membrane unit. Background technique [0002] Nanofiltration membrane and reverse osmosis membrane are semi-permeable membranes made of special materials and special processing methods, which belong to polyamide composite membranes. The acid chloride or isocyanate is prepared by reaction, and a dense ultra-thin active layer with a thickness of several hundred nanometers and a rough peak-valley morphology is formed on the surface of the porous support layer. [0003] In practical applications, nanofiltration membranes and reverse osmosis membranes are in contact with metal ions, microorganisms, insoluble precipitates, organic pollutants, biological sludge, colloids, oils, etc. in sewage for a long time, and physical and chemical The concentration of some solutes ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D65/10G01N1/10C02F1/44
CPCB01D65/10G01N1/10C02F1/441C02F1/442G01N2001/1031C02F2209/08C02F2209/05C02F2209/10
Inventor 田黎黎周俊蔡斌高新肖宇轩
Owner HUNAN JUNXIN ENVIRONMENTAL PROTECTION CO LTD
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