Multi-stage and multi-section combined type chemical engineering high-difficulty wastewater zero-discharge treatment system

Abstract

The invention discloses a multi-stage and multi-section combined type chemical engineering high-difficulty wastewater zero-discharge treatment system, which is characterized in that wastewater in a water collecting tank is lifted into an advanced catalytic oxidation system through a sewage lifting pump; after a catalytic oxidation reaction, part of macromolecular refractory organic matters are oxidized into easily degradable organic matters; pH value adjusting and flocculating agent adding are performed to carry out coagulating sedimentation; effluent and domestic sewage in a factory flow intoa biochemical regulating tank together, and then are lifted to a UASB anaerobic tower by an anaerobic water inlet pump; a part of organic matters is removed through anaerobic microorganism treatment;then the obtained wastewater enters an A/O biochemical system, and most of remaining organic matters are degraded by anoxic and aerobic microorganisms; and the wastewater is precipitated and enters aFenton oxidation system to further remove part of refractory organic matters of the microorganisms, and finally the produced water treated by an ultrafiltration system and a reverse osmosis system iscontinuously recycled to a chemical production system. The system is simple in structure, reasonable in design, low in cost and capable of realizing advanced treatment and zero emission of chemical wastewater.

Description

technical field [0001] The invention belongs to the technical field of chemical wastewater treatment systems, and in particular relates to a multi-stage and multi-section composite zero-discharge treatment system for difficult chemical wastewater. Background technique [0002] In recent years, with the rapid development of my country's chemical industry, a large number of organic pollutants have entered water bodies through various channels, and some of them are difficult to biodegrade and remove, which poses a serious threat to both human beings and the environment. Wastewater discharged by coal chemical enterprises is produced during the coal processing process, including gasification wastewater, liquefaction wastewater and coking wastewater, mainly high-concentration coal gas washing wastewater. The water quality of the wastewater is complex, containing a large amount of phenols, polycyclic aromatic compounds and heterocyclic compounds, cyanide, oil, ammonia nitrogen and ...

AI Technical Summary

Problems solved by technology

[0003] With the gradual improvement of the national environmental protection law, the effluent water quality of the secondary biochemical treatment process in the conventional coal chemical treatment process cannot meet the national standard, in which COD is generally 150-200mg / L, total phenol concentration is 80-120mg / L, ammonia nitrogen is in 35-50mg / L, it needs advanced treatment to meet the discharge requirements. Traditional advanced treatment methods such as pure activated carbon have slow adsorption speed, small adsorption capacity, and difficult regeneration. In addition, the sludge treatment cost in the secondary sedimentation tank is high, and its large accumulation not only Occupies land resources, but also pollutes the atmosphere, water and soil, so it is necessary to seek efficient sludge treatment technology, advanced wastewater treatment and zero discharge technology

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