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Non-destructive method for reverse osmosis system dirt block

A non-destructive, reverse osmosis technology, applied in the field of non-destructive determination of reverse osmosis system fouling, can solve the problems of water system outage, expensive reverse osmosis membrane, high analysis cost, etc., and achieve the goal of reducing analysis cost Effect

Inactive Publication Date: 2013-04-17
STATE GRID HEBEI ENERGY TECH SERVICE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a destructive inspection of the reverse osmosis membrane, which not only requires the shutdown of the water production system, but also the reverse osmosis membrane is expensive and the analysis cost is high

Method used

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  • Non-destructive method for reverse osmosis system dirt block
  • Non-destructive method for reverse osmosis system dirt block
  • Non-destructive method for reverse osmosis system dirt block

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A power plant in the South Power Grid of Hebei Province carried out chemical cleaning on the reverse osmosis system. The chemical cleaning methods are ① pickling (hydrochloric acid pH value 2), ② soaking after pickling, ③ washing with water after soaking, ④ alkaline washing (sodium hydroxide and twelve Sodium alkylbenzene sulfonate (pH value 12), ⑤Soak after alkaline washing, ⑥Wash with water after soaking, ⑦Pickling again. We conducted elemental analysis of the cleaning effluent by plasma emission spectrometry (ICP), and the analysis results are shown in Table 1.

[0016] Table 1 Elemental analysis of reverse osmosis chemical cleaning effluent (unit: mg / L)

[0017]

[0018] Note: ICP requires that the liquid be analyzed after adding acid, so the alkali soaking solution is filtered after adding acid and then treated with acid after filtering.

[0019] It can be seen from the data in Table 1 that:

[0020] (1) Phosphorus-containing substances on the membrane surfac...

Embodiment 2

[0029] A power plant in Hebei South Power Grid used reclaimed water as unit water after ultrafiltration and reverse osmosis treatment. The filter element of the security filter of the reverse osmosis system was fouled, causing the output of the system to drop, and the reverse osmosis system could not operate stably.

[0030] Since the fouling of the reverse osmosis system mainly occurs on the filter element of the security filter, considering that some metal elements in the reverse osmosis feed water or some impurities that may be contained in the medicament may have a certain impact on the fouling, so the various aspects of the reverse osmosis system The water samples were analyzed by plasma emission spectrometry (ICP), and the analysis results are shown in Table 2.

[0031]

[0032] Table 2 ICP analysis of each water sample in the reverse osmosis system (unit: mg / L)

[0033]

[0034] Note: ①—means not detected; ②Before and after reverse osmosis dosing refers to bef...

Embodiment 3

[0051] A power plant in the South Power Grid of Hebei used circulating water and sewage as circulating water after ultrafiltration and reverse osmosis treatment. The filter element of the security filter of the reverse osmosis system was fouled, causing the output of the system to drop, and the reverse osmosis system could not operate stably.

[0052] Since the fouling of the reverse osmosis system mainly occurs on the filter element of the security filter, considering that some metal elements in the reverse osmosis feed water or some impurities that may be contained in the medicament may have a certain impact on the fouling, so the various aspects of the reverse osmosis system The water samples were analyzed by plasma generation spectrometry (ICP), and the analysis results are shown in Table 4.

[0053] Table 4 ICP analysis of each water sample in the reverse osmosis system (unit: mg / L)

[0054]

[0055] Note: ①—means not detected; ②Before and after reverse osmosis dosing ...

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Abstract

The invention relates to a non-destructive method for a reverse osmosis system dirt block. According to the method, a plasma emission spectrometer is adopted for analyzing the elements of inlet water of the reverse osmosis system, waste liquid after reverse osmosis chemical cleaning and blocked dirty material of the reverse osmosis system, so as to determine the reason for the reverse osmosis system dirt block. The method can be carried out when the reverse osmosis system runs, other tests and measures can be conducted at the same time, and reverse osmosis membranes are not damaged, so that the analysis cost is effectively lowered.

Description

technical field [0001] The invention relates to a non-destructive detection method for fouling of a reverse osmosis system. technical background [0002] With the continuous shortage of water resources, the increasingly stringent national water conservation and environmental protection policies and the continuous rise in water prices, reclaimed water reuse has become a prerequisite for new construction and expansion of thermal power plants in northern China. As an important means of advanced treatment of reclaimed water, reverse osmosis has been widely used. Due to the complex and frequent fluctuations in urban water quality, fouling of the reverse osmosis system occurs from time to time, and once the fouling of the reverse osmosis occurs, it will have a direct impact on the stable and reliable water supply of the unit. [0003] Since there are many factors affecting reverse osmosis fouling, the real cause of reverse osmosis fouling cannot be fully and accurately judged sol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D65/10
Inventor 龙潇石景燕刘克成高燕宁任汉涛张建华
Owner STATE GRID HEBEI ENERGY TECH SERVICE CO LTD
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