Coal-coking wastewater treatment system

Abstract

The invention relates to a coal-coking wastewater treatment system which comprises an ammonia blowing and stripping tank, an ammonia absorption tank, an air-floated oil removal tank, a wastewater adjustment tank, a coagulating sedimentation tank, an electrolytic tank, a packing type anoxic / anaerobic reaction tank and a backflow type biological aerated filter, wherein a denitrification additive adding and metering system is arranged in the ammonia blowing and stripping tank; the ammonia absorption tank is filled with a sulfuric acid solution with the mass concentration being 2-4%; the air-floated oil removal tank is divided into a mixing area and a separating area in sequence from bottom to top; the coagulating sedimentation tank comprises a stirring and mixing area and a sedimentation area; the electrolytic tank comprises a left chamber and a right chamber, that is, a positive pole chamber and a negative pole chamber respectively; the middle and lower parts of the positive pole chamber and the negative pole chamber are communicated with each other; the upper parts of the positive pole chamber and the negative pole chamber are partitioned by a partition; the positive pole chamber and the negative pole chamber are respectively provided with a positive electrode plate and a negative electrode plate; the positive electrode plate and the negative electrode plate are respectively connected with an external positive power supply and an external negative power supply; the packing type anoxic / anaerobic reaction tank comprises an aerobic section, an anoxic section and an anaerobic section which are partitioned by baffle plates; the backflow type biological aerated filter comprises a downstream area, an upstream area and a sewage area.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a coal coking wastewater treatment system. Background technique [0002] Coal coking wastewater mainly comes from ammonia distillation wastewater produced by high-temperature coal cracking and raw gas cooling, crude benzene final cooling water produced in the process of coal gas purification, wastewater and washing wastewater produced in processes such as crude tar processing and benzene refining. The composition of coal coking wastewater is complex and changeable, and its water quality varies with the composition of raw coal and the coking process. Wastewater contains a high concentration of ammonia nitrogen and many heterocyclic compounds that are difficult for microorganisms to degrade, such as naphthalene, quinoline, etc. Among them, the inorganic compounds are mainly a large amount of ammonia salt, thiocyanide, sulfide, cyanide, etc. , as well as monocyclic...

AI Technical Summary

Problems solved by technology

Due to the difference in coal quality, foreign advanced treatment technologies cannot be applied. At present, the treatment of coking wastewater pollution is not optimistic. 80% of the enterprises in the treatment of coal coking wastewater in the country have ammonia nitrogen and COD emissions that do not meet the standards. The treatment of coal coking wastewater Technology has become the bottleneck of my country's clean coal conversion technology

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