Oversize steel enterprise comprehensive wastewater advanced treatment recycling technique and system

Abstract

The invention relates to an oversize steel enterprise comprehensive wastewater advanced treatment recycling technique and system. The technique sequentially comprises the processes of hydrolysis acidification/coagulative precipitation, biological filtration, filtration and advanced oxidation. The hydrolysis acidification process is carried out in a hydrolysis acidification tank; the coagulative precipitation process is carried out in a high-efficiency coagulative precipitation tank; the biological filtration process is sequentially carried out in an aeration biofilter and a denitrification biofilter; the filtration process is carried out in an air-water backwashing sand filter; and the advanced oxidation process is carried out in an ozone oxidation tank. The influent water quality indexes are as follows: the COD (chemical oxygen demand) is at most 100 mg/L, the BOD (biochemical oxygen demand) is at most 20 mg/L, the ammonia nitrogen is at most 30 mg/L, and the total cyanide is at most 1.0 mg/L. The effluent water quality satisfies the related specifications in Steel Industry Water Pollutant Discharge Standard GB13456-2012. The technique is suitable for advanced treatment of low-concentration nondegradable industrial wastewater, and has favorable removal effects on ammonia nitrogen, total nitrogen, COD and the like.

Description

Technical field [0001] The present invention relates to the technical field of advanced treatment and reuse of wastewater, and in particular to a comprehensive wastewater containing iron and steel, such as sintering, ironmaking, steelmaking, cold rolling, hot rolling, power generation, coking, and domestic wastewater, after advanced treatment. Process and system used. Background technique [0002] At present, due to the age of some traditional iron and steel enterprises, their underground pipe networks for production water and domestic sewage such as sintering, ironmaking, steelmaking, cold rolling, hot rolling, power generation, coking, etc. are intricate, and it is difficult to achieve a split system for discharge and quality treatment. Large; only processes with high levels of pollutants such as coking and cold rolling have basically established a separate treatment system, which will be discharged to the drainage network of the plant or reused after advanced treatment after r...

AI Technical Summary

Problems solved by technology

[0003] The composition of comprehensive wastewater from extra-large iron and steel enterprises is complex. If it is directly discharged after being treated according to conventional industrial wastewater treatment methods, its ammonia nitrogen, total nitrogen, and COD will hardly meet the standards; It will not only cause a serious waste of water resources, but also cause serious damage to the environment.

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