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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AI-Extracted Technical Summary

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 Fen...
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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.

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

Examples

  • Experimental program(2)

Example Embodiment

[0035] Example 1
[0036] The COD of the effluent from the second settling tank of a coking plant wastewater plant in Shanxi is 120-150mg/L, and other indicators meet the national first-level discharge requirements.

Example Embodiment

[0038] Example 2
[0039] The COD of the biochemical effluent from the wastewater plant of a coking plant in Inner Mongolia is 106mg/L, and other indicators have reached the national first-level emission requirements.
[0040] The electric Fenton-coagulation method described in the present invention is used for advanced treatment. The biochemical effluent of the coking wastewater enters the adjustment tank, adds acid solution to adjust the pH to 2.6, and then enters the electrochemical reactor, 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 effluent of the electrochemical reactor enters the coagulation sedimentation tank, the alkali is added to adjust the pH to 7-8, the flocculant PAM dosage is 0.5mg/L, the residence time is 15min, and the effluent COD is 42mg/ L, discharge up to the standard or enter the intermediate tank for reuse and treatment.
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