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
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[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.
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[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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