An in-situ reduction system for gaseous pollutants in landfills based on intercalated functional layers

Abstract

The invention discloses an in-situ reduction system for gas-phase pollutants at a refuse landfill based on an intercalation function layer. The system comprises the intercalation function layer disposed above a refuse heap body of the refuse landfill and under a closure covering system, wherein the intercalation function layer comprises a gas-permeable film layer, functional filling layer and an HDPE film layer which are disposed in succession; and a power-free air automatic exchange system is also disposed in the functional filling layer. Mineralized refuses in the functional filling layer are characterized by a high organic content, a large number of microbe, abundant porous structures of mud carbon, a high content of nitrogen in straw stalks after oxidative ammonolysis and so forth andthe power-free air automatic exchange system is installed to promote formation of an aerobic environment for microbial activities, so the system can effectively reduce a release concentration and a release amount of the gas-phase pollutants at the refuse landfill. Application of the system in a current refuse landfill structure has the advantages that operations are simple; cost is low; adsorptionand degradation effects are good; and social and economic benefits are very high.

Description

technical field [0001] The invention relates to an in-situ reduction system for gas phase pollutants in landfills based on an intercalation-type functional layer, in particular to a construction of an intercalation-type functional layer in a landfill and an in-situ reduction method for odorous gases and methane. It belongs to the technical field of environmental protection. Background technique [0002] Gas phase pollutants such as odorous gas and methane released in landfills are large, and it is difficult to reduce them in situ. The existing waste landfill closure covering system is composed of HDPE film and covering layer above the waste dump, which has a certain effect in isolating the direct contact between the waste and the external environment, and providing nutrient soil for the planting of surface vegetation. But for NH 3 、H 2 The active reduction ability of malodorous gases such as S and methane is low. [0003] Comparing Zhao Youcai and Han Dan's "system and m...

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Problems solved by technology

[0003] Comparing Zhao Youcai and Han Dan's "system and method for oxidizing methane (CN 102906032 A)" patent, this patent makes full use of the methane oxidation ability of mineralized waste, introduces external gas through pipelines, creates an aerobic environment, and The nutrient solution improves the methane oxidation rate of the landfill and provides a suitable landfill methane oxidation method; however, due to the need to add the nutrient solution, the cost of raw materials is increased, and at the same time only relying on the natural flow of external gas, the air is not easy to enter the garbage dump The interior of the body, especially the implementation process is exposed to the surface, which can easily lead to the release of odor

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