Treatment system and treatment method for coal-to-liquid wastewater

Abstract

The present invention discloses a treatment device and a treatment method for coal-to-liquid wastewater. The treatment device for the coal-to-liquid wastewater includes: a pretreatment device including: a pH value adjusting tank for regulating the pH value of the coal-to-liquid wastewater to be from 5.5 to 6.5; a primary degreasing unit which is connected with the pH value adjusting tank and is used for removal of tar and tar residue in the coal-to-liquid wastewater; a secondary degreasing unit which is connected with the primary degreasing unit and is used for removal of soluble oils in the coal-to-liquid wastewater; a phenol-removal ammonia-distillation unit which is connected with the secondary degreasing unit and is used for removing phenol and ammonia in the coal-to-liquid wastewater; a third degreasing unit which is connected with the phenol-removal ammonia-distillation unit and is used for removing oil slick in the coal-to-liquid wastewater; a multi-media filter which is connected with the third degreasing unit and is used for removing suspended matters in the coal-to-liquid wastewater to form pretreated wastewater; and a biochemical treatment device used for performing biochemical treatment to the pretreated wastewater. By employing the technical solution of the invention, treatment capacity of the biochemical treatment device to the coal-to-liquid wastewater is improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a treatment system and method for coal-to-oil wastewater. Background technique [0002] From the perspective of energy structure, my country is a country with "more coal and less oil and gas". Due to the increasing demand for oil, the use of related technologies to convert coal into refined oil is an important way to solve the lack of oil resources in our country. [0003] Coal-to-liquids (CTL for short) is a technology that uses coal as raw material to produce oil products and petrochemical products through chemical processing, including direct coal liquefaction and coal indirect liquefaction. The direct liquefaction of coal is to directly liquefy coal into liquid hydrocarbon fuels by catalytic hydrogenation under high temperature and high pressure conditions, and further refine (removal of sulfur, nitrogen, oxygen and other atoms) to form the required fuel oil; ind...

AI Technical Summary

Problems solved by technology

[0004] The existing biochemical system for treating wastewater has the advantages of environmental protection and cleanliness. However, the composition of this type of coal-to-oil wastewater is quite complex, with the characteristics of high oil content, high ammonia nitrogen, and high organic matter. It is one of the difficult industrial wastewater to be treated. biochemical method for processing

Images