Coking Wastewater Advanced Treatment System and Its Reuse Process

Abstract

The invention discloses an advanced treatment system for coking wastewater and a recycling technology adopting the advanced treatment system. The system comprises a grease removal tank, a regulating tank, a biochemical tank, a sedimentation tank, a biological filter, a multi-media filter and an adsorption device. According to the advanced treatment system for the coking wastewater and the recycling technology adopting the advanced treatment system, multiple devices are combined to form a novel advanced treatment system for the coking wastewater, other chemical agents are not needed, and secondary pollution is avoided; meanwhile, the coking wastewater treatment cost is reduced, a large amount of production water supply is saved, and an economical, practical and efficient path is provided for advanced treatment and recycling of the coking wastewater.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a coking wastewater advanced treatment system and a recycling process thereof. Background technique [0002] Coking wastewater is high-concentration organic wastewater produced in the process of coal-to-coke, gas purification, and coking production recovery. It also contains organic pollutants such as phenols, naphthalene, pyridine, quinoline and other heterocyclic and polycyclic aromatic compounds and aliphatic compounds. The wastewater is highly toxic, and some of them have been confirmed as carcinogens by research. In addition, high concentrations of ammonia nitrogen, sulfide, and cyanide have a strong inhibitory effect on microbial activity, and the effect of biological nitrogen removal is not good. At present, different forms of A / O biological denitrification processes are generally used as the main process for coking wastewater, and then coagulation and s...

AI Technical Summary

Problems solved by technology

However, the water quality of most coking enterprises' external drainage is difficult to meet the standards of GB16171-2012 "Discharge Standards for Pollutants in the Coking Chemical Industry" for newly established enterprises. Therefore, advanced treatment of coking wastewater to meet the discharge standards is an urgent problem for enterprises to solve

[0003] The existing problems in the advanced treatment and reuse process of coking wastewater mainly include: (1) Advanced treatment of wastewater by chemical agents (such as Fenton’s reagent, hypochlorite, ferrate and other strong oxidants), which may introduce Secondary pollution, problems such as pipe network and equipment corrosion, increase the cost of subsequent desalination, and at the same time, the amount of chemical agents added in this process is large, and the water quality is easily affected by flocculation, making it difficult to control the water quality; (2) The coking wastewater is used for wet quenching Coke or blast furnace slag flushing, pollutants in wastewater will transfer from liquid phase to gas phase, and the operating environment is poor; (3) Membrane advanced treatment has high investment costs, high maintenance costs, and low unit treatment efficiency

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