Leachate treatment system for rural household refuse landfill

Abstract

The invention discloses a leachate treatment system for a rural household refuse landfill, and relates to the technical field of environmental protection and treatment. The leachate treatment system comprises a leachate regulating tank, and further comprises a coagulation reaction tank, a first sedimentation tank, a first intermediate water tank, an AO biochemical device, a second intermediate water tank, an electro-Fenton tank, a neutralizing tank, a second sedimentation tank, a multi-stage electro-catalytic oxidation device, a third sedimentation tank, a third intermediate water tank, a denitrification tank, an MBR membrane tank, a fourth intermediate water tank, a RO membrane device and a clean water tank which are connected in sequence. According to the method, the landfill leachate can be treated with low cost and high efficiency, so that the defects in the existing landfill leachate treatment method are overcome.

Description

technical field [0001] The invention relates to the technical field of environmental protection and treatment, in particular to a leachate treatment system for township domestic waste landfills. Background technique [0002] At present, most of the processes and technologies used in most leachate stations are pretreatment by physical and chemical methods first, and then treated by biochemical methods, and finally discharged up to the standard; or purely using two-stage membrane system for treatment, resulting in short life of the membrane system and high operating costs. Looking at these technologies and processes, there are still aspects that need to be further improved. Among the existing patented technologies and processes, the technical processes are complex and the equipment investment is huge; or the efficiency is low in the process of leachate treatment, and the hydraulic retention time is long; Or the required adsorption materials are expensive, and the cost of sewag...

AI Technical Summary

Problems solved by technology

[0002] At present, most of the processes and technologies used by most leachate stations are to use physical and chemical methods for pretreatment first, then use biochemical methods for treatment, and finally discharge up to the standard; or purely use two-stage membrane system for treatment, resulting in short life of the membrane system and high operating costs.

Looking at these technologies and processes, there are still aspects that need to be further improved. Among the existing patented technologies and processes, the technical processes are complex and the equipment investment is huge; or the efficiency is low in the process of leachate treatment, and the hydraulic retention time is long; Or the required adsorption materials are expensive, and the cost of sewage treatment is high

More importantly, these treatment processes mainly focus on the removal of organic matter and chroma, and are not effective in removing heavy metal pollutants in leachate.

However, repeated monitoring of landfill leachate and recent literature reports have shown that with the complexity and diversification of waste components, the heavy metal content in landfill leachate has exceeded the secondary standard for sewage discharge by several times or even dozens of times. The revolutionary process technology effectively removes heavy metals, which will cause great harm to the surrounding environment

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