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Sewage treatment method for circulating cooling water system

A technology of circulating cooling water and treatment method, applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of reducing Cl- and heterotrophic bacteria content, complex process and so on , to achieve the effect of low cost, reduced corrosion rate and easy operation

Inactive Publication Date: 2011-05-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of removing Cl in the sewage treatment of the circulating cooling water system in the prior art. - The process is complicated, and the Cl cannot be reduced at the same time through the same process - And the shortcomings of heterotrophic bacteria content, provide a low-cost, simple operation to reduce the Cl in the sewage of the circulating cooling water system - and methods for heterotrophic bacteria content

Method used

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Experimental program
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Effect test

Embodiment 1

[0032] The sewage from the circulating water system of a power plant, Cl - High content (cations are mainly Na + , Ca 2+ , Mg 2+ ), its composition before processing is as shown in Table 1. Adopt the electrolysis method of the inventive method to process, the size of the electrolyzer is 5m * 2m * 2m, install 5 pairs of series electrode plates in the electrolyzer, anode and cathode base material are all titanium, the surface is plated with platinum, each electrode plate area 2m 2 , the voltage of each pair of electrode plates is 2.5V; electrolysis for 15min, analysis of Cl after electrolysis - Concentration, total number of heterotrophic bacteria and corrosion rate, the results are shown in Table 1.

[0033] Table 1

[0034] project

Embodiment 2

[0036] The sewage from the circulating water system of a power plant, Cl - and Ca 2+ The content is high, and its composition before treatment is as shown in table 2, adopts the method of the present invention to carry out electrolysis, and the size of electrolyzer is 5m * 3m * 5m, and 2 pairs of series electrode plates are installed in electrolyzer, and anode and cathode base material are all Titanium, the surface is plated with ruthenium and palladium respectively, and the area of ​​each electrode plate is 20m 2 , each pair of electrode plate voltage 3.5V; electrolysis 30min. Analysis of Cl after electrolysis - Concentration, total number of heterotrophic bacteria and corrosion rate, the results are shown in Table 2. Add softener NaOH after electrolysis, and the dosage concentration is 200mg / L. Analytical Ca 2+ Concentration and corrosion rate, the results are shown in Table 2.

[0037] Table 2

[0038] project

Embodiment 3

[0040] Sewage from the first circulating water system of a chemical plant, Cl - And suspended matter content is high, and its composition before treatment is as shown in table 3, adopts the electrolysis of the inventive method to process. The size of the electrolytic cell is 10m×4m×4m, and 8 pairs of parallel electrode plates are installed in the electrolytic cell. The anode base material is titanium, the surface is plated with platinum, the cathode base material is titanium, and the surface is plated with iridium; the area of ​​each electrode plate is 9m 2 , the voltage of each pair of electrode plates is 4.5V; electrolysis for 20min; analysis of Cl after electrolysis - Concentration, total number of heterotrophic bacteria and corrosion rate, the results are shown in Table 3. After electrolysis, carry out fiber filtration (the filter material is polyester long fiber, the silk diameter is 14-16μm, the porosity is 90%, and the specific surface area is 8000m 2 / m 3 , the heig...

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Abstract

The invention relates to a sewage treatment method for a circulating cooling water system. The invention provides the sewage treatment method for the circulating cooling water system, wherein the method comprises a step of electrolyzing the sewage of the circulating cooling water system. By using the sewage treatment method for the circulating cooling water system, Cl- in the sewage of the circulating cooling water system can be effectively removed, the number of heterotrophic bacteria can be reduced to a certain degree, the corrosion rate is reduced, and the water quality reaches the requirement of recycled circulating cooling water; and in addition, the method provided by the invention is simple and convenient to operate, and has low cost.

Description

technical field [0001] The invention relates to a sewage treatment method of a circulating cooling water system. Background technique [0002] In the open industrial circulating cooling water system, with the evaporation, various impurities in the water are continuously concentrated, and the water quality characteristics change, such as the increase of hardness and alkalinity, the scaling tendency of the water quality is enhanced, and Cl - The increase of concentration increases the corrosiveness of water quality, especially the stress corrosion tendency of stainless steel equipment greatly increases, and the increase of organic matter concentration promotes the growth of biological slime. Therefore, in order to control the water quality of the circulating water, it is necessary to add new water (ie supplementary water) and discharge concentrated water (ie sewage). [0003] At present, flocculation, sedimentation, filtration, and membrane separation are generally used to tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F9/06C02F5/08C02F1/52
Inventor 李本高侯钰谭丽
Owner CHINA PETROLEUM & CHEM CORP
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