Multi-layer composite liner system for leakage prevention and pollution prevention of bottom of refuse landfill

Abstract

The invention relates to a multi-layer composite liner system for leakage prevention and pollution prevention of the bottom of a refuse landfill. The multi-layer composite liner system comprises a foundation layer, a clay layer, a modified fly ash layer, an iron powder layer, a lime layer, a second geomembrane, a leakage detection layer, a first geomembrane and a leachate guide layer, all of which are paved in sequence. According to the multi-layer composite liner system, the geomembrane structure is not prone to being destroyed; leachate leaking is avoided; according to the characteristic that the contents of organic acid, heavy metal, ammonia nitrogen and other substances in the landfill leachate are high, lime, iron powder and modified fly ash are sequentially set to remove harmful components of the landfill leachate; the clay amount is reduced; further migration of pollutants is effectively stopped; the stop effect on the pollutants is good; and pollutant migration can be effectively avoided for a long time.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a multi-layer composite liner system used for anti-seepage and anti-fouling at the bottom of a landfill. Background technique [0002] With the acceleration of urbanization, the output of urban solid waste in my country has also increased year by year; and sanitary landfill has become the most important way of urban waste disposal due to its advantages of environmental protection, safety, high efficiency and low cost. [0003] Due to the lack of effective classification of urban waste in my country, industrial waste, construction solid waste, domestic waste, etc. are mixed and landfilled. Under the action of microbial decomposition, rainfall, and surface runoff, it is easy to form toxic waste with high content of organic matter, heavy metals, ammonia nitrogen, and other pollutants. Hazardous landfill leachate. Once leaked, it will cause immeasurable...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a multi-layer composite liner system used for anti-seepage and anti-fouling at the bottom of the landfill, which solves or partially solves the problems in the prior art that the geomembrane is easily damaged and the leakage of leachate is caused, and the clay liner cannot be used for a long time. The technical problem of effectively preventing the migration of pollutants has achieved the technical effect of good pollutant blocking effect, long-term effective prevention of pollutant migration, and the geomembrane structure is not easily damaged to avoid leachate leakage.

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