Treating system and method for coking waste water

Abstract

The invention discloses a treating system and method for coking waste water. The treating system comprises a gas-energy flocculation device, at least one multi-element catalytic oxidation device and at least one biochemical device, which are successively arranged. The treating method comprises the following steps: gas-energy-flocculation pretreatment; and multi-element catalytic oxidation and biochemical treatment once or multiple times. The coking waste water contains complex organic components and high-concentration and difficultly biodegradable organic matters which cannot be degraded through simple biochemical process, so CODs in effluent exceed standards; the coking waste water contains a great number of biologically toxic substances which are not biodegradable, inhibit microbes and influence normal treatment effect on the microbes; and besides organic pollutants, the coking waste water also contains high-concentration ammonia-nitrogen and total nitrogen, which also influences normal operation of a biological treatment process.

Description

technical field [0001] The invention relates to a coking wastewater treatment system and a coking wastewater treatment method, belonging to the field of environmental engineering. Background technique [0002] Coking wastewater is a kind of toxic, harmful, high-concentration and refractory organic wastewater produced by high-temperature dry distillation of raw coal, gas purification and chemical product recovery and refining. It mainly contains phenolic compounds, aliphatic compounds, heterocyclic compounds, polycyclic aromatic hydrocarbons, ammonia nitrogen, Sulfide, cyanide, sulfur cyanide and other pollutants. Previously, coking wastewater treatment mainly consisted of processes such as oil removal, phenol removal, ammonia distillation, and biochemistry to remove most of the organic pollutants and ammonia nitrogen in the wastewater. Nowadays, with the implementation of "Discharge Standards for Pollutants in Coking Chemical Industry" (GB16171-2012 instead of GB16171-1996)...

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Problems solved by technology

[0019] (1) The organic matter in the coking wastewater is complex and contains a high concentration of refractory organic matter, which cannot be degraded through biochemical processes alone, resulting in excessive COD in the effluent;

[0020] (2) Coking wastewater contains a large amount of biologically toxic substances, which are not only non-biodegradable, but will inhibit microorganisms and affect the normal treatment effect of microorganisms;

[0021] (3) In addition to organic pollutants, coking wastewater also contains high concentrations of ammonia nitrogen and total nitrogen, which will also affect the normal operation of the biological treatment process

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