Wastewater treatment system and wastewater treatment method for hazardous waste landfill

Abstract

The invention discloses a wastewater treatment system and a wastewater treatment method for hazardous waste landfill. The wastewater treatment system comprises a pretreatment system, a membrane concentration system and an evaporative crystallization system which are sequentially connected to a wastewater adjusting tank, and the pretreatment system is provided with a dissolved air flotation system, a reduction neutralization reaction system, a sodium carbonate softening reaction tank and a coagulating sedimentation system which are sequentially connected; the membrane concentration system is provided with a multi-stage filtering device connected to a sewage outlet of the coagulating sedimentation system and a disc tube type reverse osmosis unit connected to the multi-stage filtering device; fresh water of the disc tube type reverse osmosis unit and fresh water of the concentrated water tank are led to a next-stage sewage treatment plant for water treatment; mother liquor separated by an MVR evaporator and a solid-liquid separator of the evaporative crystallization system is dried by spray drying equipment, and dried solid waste is delivered to a qualified unit for independent treatment. According to the wastewater treatment system and the wastewater treatment method, the impact of the wastewater on a next-stage sewage treatment plant is relieved while the wastewater of the hazardous waste landfill is efficiently and stably treated.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment systems and methods, in particular to a wastewater treatment system and a wastewater treatment method for hazardous waste landfills. Background technique [0002] Hazardous waste landfill wastewater mainly comes from the washing of transport vehicles and containers, washing of temporary storage, drainage of physical and chemical workshops, site washing, landfill leachate and initial rainwater, etc. The main pollutants include chemical oxygen demand, suspended solids, Total dissolved solids, petroleum, and a class of pollutants specified in the "Integrated Wastewater Discharge Standard" (GB 8978-1996), etc. Due to the functional positioning of the hazardous waste disposal center, the materials it receives are complex in composition. Wastewater from hazardous waste landfills has high total dissolved solids concentration, high hardness, large fluctuations in water quality and water volum...

AI Technical Summary

Problems solved by technology

In the actual operation process, due to the large fluctuations in water quality of hazardous waste landfills, especially the high concentration of total dissolved solids, high hardness, large fluctuations in water quality and water volume, complex pollutant components, fluctuations in the concentration of toxic and harmful substances, heavy metals, etc. , has a greater impact on the next-level sewage treatment plant, which affects its operating efficiency, and even causes the next-level sewage treatment plant to be paralyzed and unable to operate

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