New technology for treating production wastewater generated from effective component extraction of coal tar

Abstract

The invention relates to a new technology for treating production wastewater generated from effective component extraction of coal tar. The technology comprises the following steps that (1) the coal tar wastewater is pumped into an adjusting pond; (2) the wastewater in the step (1) is conveyed into a coagulation air floatation system for flocculation; (3), dross obtained in the step (2) after theflocculation is dehydrated; (4) the wastewater in the step (2) after the flocculation flows through a biochemical system, a precision filtering system, an advanced electrocatalytic oxidation system and an ultrasound system in sequence and flows into a sand filtration and carbon filtration system; (5) a filtrate treated by the sand filtration and carbon filtration system in the step (4) is conveyedto an ultrafiltration system; (6) concentrated water treated by the ultrafiltration system in the step (5) is returned to the sand filtration and carbon filtration system, and the filtrate directly flows into a DTRO reverse osmosis system; (7) the concentrated water treated by the DTRO reverse osmosis system in the step (6) is returned to the adjusting pond, and clear water can be directly recycled; the technology is low in treatment cost, and the treated wastewater can stably come up to the standard for being discharged or recycled.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a new process for treating waste water produced by extracting effective components of coal tar. Background technique [0002] Coal tar is one of the important raw materials for the production of chemicals. The wastewater produced during its processing and storage has a high concentration of pollutants COD, mainly containing phenolic substances, complex components, high toxicity, and a large amount of persistent organic pollutants, which is difficult to treat If the waste water is not treated and directly discharged into the environment, it will cause serious pollution to the environment. At present, the treatment methods of coal tar waste water mainly include incineration and biological treatment. The method requires advanced oxidation pretreatment and then biological treatment. In the advanced oxidation pretreatment process, sulfuric acid needs to be ad...

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Problems solved by technology

[0002] Coal tar is one of the important raw materials for the production of chemicals. The wastewater produced during its processing and storage has a high concentration of pollutants COD, mainly containing phenolic substances, complex components, high toxicity, and a large amount of persistent organic pollutants, which is difficult to treat If the waste water is not treated and directly discharged into the environment, it will cause serious pollution to the environment. At present, the treatment methods of coal tar waste water mainly include incineration and biological treatment. The method requires advanced oxidation pretreatment and then biological treatment. In the advanced oxidation pretreatment process, sulfuric acid needs to be added, resulting in the generation of H in the subsequent biological treatment process. 2 S, produces serious secondary pollution; at the same time, SO 4 2- It has obvious inhibitory effect on the growth of microorganisms, affects the effect of biological treatment, and the wastewater is difficult to discharge stably; therefore, it is very necessary to provide a new process for the extraction of active components of coal tar that can be discharged stably and meet the standards.

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