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

A coking wastewater and combined process technology, applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water/sewage multi-stage treatment, etc., can solve problems such as difficulty in COD compliance, achieve low operating costs, and significant treatment effects , Facilitate the effect of engineering popularization and application

Active Publication Date: 2011-08-03
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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Problems solved by technology

[0009] Aiming at the existing problems that the biochemical effluent COD of coking wastewater is difficult to reach the standard and the deep reuse treatment exists, the purpose of the present invention is to provide a method for the advanced treatment of coking wastewater by the combination of electric Fenton and coagulation process, and the deep pretreatment of coking wastewater biochemical effluent Treatment, reduce the concentration of COD in wastewater to below 60mg / L, solve the problems existing in biochemical treatment, and meet the requirements of membrane separation for advanced treatment of influent

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

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Embodiment 1

[0036] The COD of the effluent from the secondary sedimentation tank of a coking plant wastewater plant in Shanxi is 120-150mg / L, and other indicators have reached the national first-level discharge requirements.

Embodiment 2

[0039] The biochemical effluent COD of a coking plant wastewater plant in Inner Mongolia is 106mg / L, and other indicators have met the national first-level discharge requirements.

[0040] Advanced treatment is carried out using the electro-Fenton-coagulation method described in the present invention. The biochemical effluent of coking wastewater enters the regulating tank, and acid solution is added to adjust the pH to 2.6, and then enters the electrochemical reactor, and the H 2 o 2 The dosage is 150mg / L, and the current density is adjusted to 200A / m 2 , the residence time is 20min, the electrochemical reactor effluent enters the coagulation sedimentation tank, the pH is adjusted to 7-8 by adding lye, the flocculant PAM dosage is 0.5mg / L, the residence time is 15min, and the COD of the effluent is 42mg / L L, discharge up to the standard or enter the intermediate pool for reuse treatment.

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Abstract

The invention relates to a method for treating coking waste water by an electro-Fenton-coagulation combination process, which comprises the following steps of: 1) introducing biochemical effluent of the coking waste water into a regulation pond, regulating water quality and water volume, and regulating the pH value to be between 2 and 4; 2) introducing the effluent in the regulation pond into an electrochemical reactor, adding H2O2, and regulating current density to be between 50 and 300 A / m<2>; 3) introducing the effluent in the electrochemical reactor into a coagulation sedimentation pond, regulating the pH value to be between 7 and 8 by using alkaline liquor, adding a flocculating agent, performing a flocculating reaction, and performing mud water separation in the sedimentation pond; and 4) filtering the effluent in the sedimentation pond by a sand leach unit, and discharging. By the method, the biochemical effluent of the coking waste can be deeply treated, chemical oxygen demand(COD), ammonia nitrogen and chromaticity of the effluent can meet the requirements of national first-level discharge standards and the water inflow requirement of the advanced treatment of membrane separation.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a method for advanced treatment of coking wastewater by adopting an electric Fenton-coagulation combined process. Background technique [0002] 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, and the content of suspended solids, organic pollutants, salt, etc. in the effluent of biological treatment is still high , it is difficult to...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/52
Inventor 赵旭张宝峰陈发源曲久辉刘会娟胡承志
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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