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Online detection method and sampling device for membrane element of nanofiltration or reverse osmosis membrane unit

A technology of reverse osmosis membrane and detection method, which is applied in the field of on-line detection method and sampling device of membrane element of nanofiltration or reverse osmosis membrane unit, can solve the problems of low efficiency and increased maintenance cost, and achieves reduced investment, low detection cost, The effect of improving the service life

Active Publication Date: 2020-05-22
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 tell which membrane element is faulty in the membrane shell, 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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  • Online detection method and sampling device for membrane element of nanofiltration or reverse osmosis membrane unit
  • Online detection method and sampling device for membrane element of nanofiltration or reverse osmosis membrane unit
  • Online detection method and sampling device for membrane element of nanofiltration or reverse osmosis membrane unit

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1: COD is selected as the judgment index. It can be seen from the test data that 18 mg / L is the minimum water production value of all membrane elements 32, and is lower than the GB16889-2008 discharge standard, so the second membrane element 32 is selected as the reference membrane element. By calculation, the COD value of water produced by the first membrane element 32 is 8.77 times that of the standard membrane element, which is greater than 0.83 times; the fourth membrane element is 322.11 times, greater than 1.44; The COD exceeds the discharge standard of GB16889-2008, but the COD of the water produced by the fourth membrane does not exceed the discharge standard of GB16889-2008, so only the first membrane element 32 needs to be replaced, and normal operation can be resumed.

Embodiment 2

[0056] Example 2: TDS is selected as the judgment index. It can be seen from the test data that 231mg / L is the minimum water production value of all membranes, so 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 reference membrane element product water, greater than 1.23 = 1.728 times; according to condition 2, the recheck test shows that the product water COD = 121mg / L, which exceeds the GB16889-2008 discharge standard and needs to be replaced.

Embodiment 3

[0057] Embodiment 3: Select the electrical conductivity as the judgment index. It can be known from the test data that 458us / cm is the minimum water production value of all membrane elements 32, so the first membrane element 32 is selected as the reference membrane element. By calculation, all membrane elements 32 produce water. Judgment condition 1 of the water recheck, all membrane elements 32 are in good condition and do not need to be replaced.

[0058] like figure 2 and image 3 As shown, the present invention also correspondingly discloses an online sampling device 4 for membrane element water production of a nanofiltration or reverse osmosis membrane unit, which is used to realize the water production sampling operation in the above method. The specific structure includes a probe 41, a probe 41 One end of the probe tube 41 is provided with a water intake end 44, the other end of the probe tube 41 is provided with a water outlet end 45, and the probe tube 41 is provide...

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Abstract

The invention discloses an online detection method for membrane elements of a nanofiltration or reverse osmosis membrane unit. The method comprises the following steps: S01, when a nanofiltration or reverse osmosis membrane unit operates, sampling produced water of each membrane element; S02, detecting the detection indexes of the produced water of each membrane element; S03, comparing the actualdetection values of each membrane element with a preset standard value, selecting the actual detection value closest to the standard value as a reference detection value, and taking the membrane element corresponding to the reference detection value as a reference membrane element; and S04, comparing the actual detection values corresponding to the other membrane elements with the reference detection value to judge whether the interception performance of the corresponding membrane element is reduced. The invention also discloses a membrane element produced water online sampling device of the nanofiltration or reverse osmosis membrane unit, wherein the device comprises a probe pipe, wherein one end of the probe pipe is provided with a water taking end, the other end of the probe pipe is provided with a water outlet end, and the probe pipe is provided with a sealing fastener. The method and the device have the advantages of simplicity and convenience in operation, low equipment maintenance cost, prolonged 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 online detection method and a sampling device for a membrane element 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. They belong to polyamide composite membranes. They are composed of water phase polyamine or alcohol (phenol) and oil phase poly It is prepared by the reaction of acid chloride or isocyanate, and forms a dense ultra-thin active layer with a thickness of several hundred nanometers and a peak-valley rough morphology on the surface of the porous support layer. [0003] In practical applications, long-term contact between nanofiltration membranes and reverse osmosis membranes and metal ions, microorganisms, insoluble precipitates, organic pollutants, biological slime, colloids, grease,...

Claims

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Application Information

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Patent Type & Authority Applications(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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