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Method and device for treating coking waste water by electro-Fenton-coagulation combination

A technology of coking wastewater and coagulation, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage multi-stage treatment, etc. problems, to achieve the effect of shortening reaction time and energy consumption, reducing sludge production and consumption

Inactive Publication Date: 2011-08-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effluent quality of membrane technology can meet the requirements, but membrane pollution is serious and chemical cleaning is more frequent; at the same time, the output of membrane filtration concentrate is large, which is easy to cause secondary pollution, etc.
The electric coagulation precipitation method has low investment, simple equipment, good treatment effect on some organic matter and fast processing speed, but the single electric coagulation process has limited removal ability of refractory organic matter in coking wastewater, and it is difficult to meet the reuse water standard
Electrochemical oxidation can effectively remove refractory organic pollutants, but the investment cost and operating cost are high, making it difficult to apply on a large scale

Method used

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  • Method and device for treating coking waste water by electro-Fenton-coagulation combination
  • Method and device for treating coking waste water by electro-Fenton-coagulation combination
  • Method and device for treating coking waste water by electro-Fenton-coagulation combination

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Embodiment 1

[0052] In the wastewater treatment process of a coking plant in Shanxi, the COD of the secondary biochemical effluent is 120-150mg / L, and the chroma is not up to the standard, which has a large impact pressure on the subsequent desalination process and affects the final effluent quality.

[0053] With the treatment method and electrochemical reactor of the present invention, all indicators of the effluent meet the national first-level discharge requirements, and the COD is 54 mg / L, which is better than the first-level standard and meets the minimum standard requirement of cooling water reuse ≤ 60 mg / L. The treatment process is that the biochemical effluent of coking wastewater enters the adjustment tank, and acid solution is added to adjust the pH to 2.7, and then enters the multi-anode induction electric Fenton reactor, and the H 2 o 2 Dosing online by water injector, the dosage is 0.2mL / L, and the applied current density is 266.7A / m 2 , the residence time is 3 to 10 minutes...

Embodiment 2

[0055] Wastewater from a coking plant in Inner Mongolia, the biochemical effluent COD is 100-110mg / L, needs advanced treatment to meet the standard for reuse.

[0056] The biochemical effluent of the coking wastewater to be treated enters the regulating tank, and the acid solution is added to adjust the pH to 3.2, and then enters the multi-anode induction electric Fenton reactor, and the H 2 o 2 Dosing online by water injector, the dosage is 0.7mL / L, and the applied current density is 200.7A / m 2 , the residence time is 10min. The effluent from the multi-anode electric Fenton reactor enters the coagulation sedimentation tank, the pH is adjusted to 7-8 by adding lye, the dosage of PAM is 1.5mg / L, the residence time is 25min, and the COD of the effluent is reduced to 45mg / L, reaching its Return to standard.

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Abstract

The invention relates to a method for treating coking waste water by electro-Fenton-coagulation, which comprises the following steps of: regulating the pH value of effluent in a biochemical unit to be between 3 and 4; allowing the effluent to enter an electrochemical reaction unit, removing organic pollutants in the coking waste water under the action of electrochemical anode oxidation, electro-Fenton oxidation and electric coagulation, and adding H2O2 in the reaction process; and regulating the pH value of the treated effluent to be between 7 and 8, allowing the effluent to enter a flocculation precipitation unit, performing flocculation precipitation, and discharging clear water. The invention also provides an electrochemical reactor for realizing the method. The method and the device can be used for performing advanced treatment on the coking waste water, and also can be used for the advanced treatment on the waste water in other industries.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for treating coking wastewater by an electric Fenton-coagulation combined process. [0002] The invention also relates to an electrochemical reactor for implementing the above method. Background technique [0003] Coking wastewater mainly comes from coking plants in iron and steel enterprises. Its chemical composition is very complex, and it contains a variety of organic substances that are difficult to be degraded by microorganisms or are biologically toxic, as well as a large amount of inorganic salts such as ammonia salts, sulfides, and cyanides. Purification of organic industrial wastewater. At present, the existing coking wastewater treatment technology in my country mainly adopts A / O or A / A / O biological treatment method combined with coagulation sedimentation method. , salt, etc. are still high, and it is difficult to realize th...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/52
Inventor 曲久辉张宝峰赵旭刘会娟兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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