Method for controlling chlorine dioxide in desalting system based on ORP monitoring

A chlorine dioxide and control method technology, applied in chemical instruments and methods, general water supply saving, water/sewage multi-stage treatment, etc., can solve problems such as cumbersome operation, loss, and affecting the personal safety of testers, so as to improve safety , to promote the effect of the application

Active Publication Date: 2011-08-31
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, many of the detection reagents of the DPD method are carcinogens, which seriously affect the personal safety of the test personnel, and the test waste liquid cannot be discharged directly.
In addition, this method has the disadvantages of low detection limit, cumbersome operation, high requirements for analysts, and incapability of real-time monitoring, so it is not widely used in the field; while online meters have short service life and high cost, and are rarely used in the field.
[0005] 2. The particularity of the desalination system has high requirements for the control of chlorine dioxide, and there is a lack of effective control standards
In the early days, domestic scholars had studied the control standards of chlorine dioxide in the desalination system, but due to the lack of understanding of the properties of chlorine dioxide and sodium chlorite in the early stage, the research conclusions were not practical, and no standards were formed. Some domestic enterprises Due to the application of this conclusion, the resin and reverse osmosis membrane of the desalination system are oxidized, resulting in a large amount of loss

Method used

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  • Method for controlling chlorine dioxide in desalting system based on ORP monitoring
  • Method for controlling chlorine dioxide in desalting system based on ORP monitoring
  • Method for controlling chlorine dioxide in desalting system based on ORP monitoring

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Effect test

Embodiment 1

[0023] For the ion exchange system, when the ORP is 420mV, it can be seen from the control standard that the water quality of the water body is within the range of the secondary treatment value, and there is a certain risk. At this time, the following measures are taken according to Table 2 to make the water quality Return to normal: 1) Reduce the amount of chlorine dioxide dosing in the clarification tank and prolong the water outlet time of the clarification tank; 4) Closely monitor the quality of the influent and effluent water of the activated carbon bed. The actual monitored chlorine dioxide concentration parallel test results were 0mg / L and 0.08mg / L, mainly due to the low detection limit of manual analysis.

Embodiment 2

[0025] For the reverse osmosis desalination system, when the ORP is 350mV, compared with the control standard, it can be seen that the water quality of the water body is within the range of the secondary treatment value, and there is a certain risk. At this time, take the following measures according to Table 2. To restore water quality to normal: 1) increase the dosage of sodium bisulfite (for example, 5mg / L), increase the concentration of sodium bisulfite if necessary (for example, increase to 20%), 2) reduce the dosage of chlorine dioxide in the clarifier 3) After the ORP of the clarifier effluent drops to 400±50mv, flush the corresponding ultrafiltration device and pipeline, 4) According to the increase of ORP, appropriately reduce the output of the RO system. The actual monitored chlorine dioxide concentration parallel test results were 0mg / L and 0.08mg / L, mainly due to the low detection limit of manual analysis.

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Abstract

The invention relates to a method for controlling chlorine dioxide and chlorous acid root of desalting system in power plants. Currently, the standard of controlling chlorine dioxide both at home and abroad mainly focuses on the drinking water field and has not extended to the desalting system field yet. Due to the absence of related standards, power plants are blind to the application and control of chlorine dioxide, thereby generating many problems. The technical scheme of the invention is characterized by monitoring the concentration of chlorine dioxide via measuring ORP. When the concentration of chlorine dioxide in the desalting system exceeds standard, the following emergency processing measure is adopted: adopting three-grade ORP control standard for ion exchange desalting system and reverse osmosis desalting system, with corresponding three-grade responding strategies. The invention provides different strategies corresponding to different risk rankings, thereby substantially improving the security of chlorine dioxide application in desalting system of power plants and promoting the application of the chlorine dioxide in the whole water treatment industry.

Description

technical field [0001] The present invention relates to the field of desalinated water systems in power plants, in particular to a control standard for chlorine dioxide (and chlorite) in a desalination system (including ion exchange desalination and ultrafiltration+reverse osmosis desalination) and when the two Emergency response measures when chlorine oxide control is out of balance. Background technique [0002] Chlorine-based disinfectants (chlorine gas, chlorine ammonium and sodium hypochlorite) will produce a large amount of carcinogenic halogenated hydrocarbons (THMs) during use, which are not easy to remove by conventional methods, and chlorine dioxide (C1O 2 ) is an environment-friendly disinfectant, which is an ideal product recognized and widely promoted in the world to replace chlorine-based disinfectants, but there are currently two factors that hinder its application in power plant desalination systems. [0003] 1. Lack of effective monitoring means. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCY02A20/131
Inventor 曹求洋
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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