System and method for guiding discharge and collection of landfill gas

Abstract

The invention relates to a system and a method for guiding discharge and collection of landfill gas. In the invention, landfill gas is collected through a gas collecting shaft which can be drawn upward with the increase of a height of a rubbish body and percolated liquid of the rubbish body is led through a way of combining internal three-dimensional discharge and surface collection. The system comprises water guiding blind drains, a gabion, the gas collecting shaft, master pipes for surface collection, gas gathering pipes and percolated liquid processing device. The water guiding blind drains are arranged respectively in different levels of the rubbish body. The two water guiding blind drains in neighboring levels of the rubbish body are communicated with each other through the gabion installed vertically. The gas collecting shaft is communicated with the water guiding blind drains in all levels of the rubbish body through connection canals and can be drawn upward with the increase of a height of the rubbish body. The top of the gas collecting shaft is provided with an outlet for landfill gas. The outlet of landfill gas is communicated with the gas gathering pipes for landfill gas. An outside surface of the rubbish body is provided with the master pipes for surface collection. The master pipes for surface collection are communicated respectively with water guiding blind drains in the different levels of the rubbish body. The lower portions of the master pipes for surface collection are connected to the percolated liquid processing device. The system utilizing the method of the invention has the advantages of safe operation, stable system structure, effective guiding discharge for excess water in a rubbish body, and high landfill gas collection efficiency.

Description

technical field [0001] The invention relates to a guide and discharge technology for purifying landfill gas, in particular to a landfill gas guide and discharge collection system capable of significantly improving the collection rate of landfill gas and a method thereof. Background technique [0002] Landfill gas (LFG) is a gas produced by anaerobic fermentation or degradation of a large amount of organic components contained in garbage during the landfill process. The main components of landfill gas are methane and carbon dioxide. At the same time, it contains trace amounts of toxic gases such as hydrogen sulfide, mercaptans, vinyl chloride, toluene, hexane, methyl chloride, and xylene. The methane in the landfill gas is a flammable organic matter. The H / C in the methane molecule is high, the carbon content is low, and it is easy to achieve full combustion. It is an energy substance with a high calorific value. However, landfill gas has hidden dangers such as flammability...

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Problems solved by technology

[0005] Aiming at the problem that the collection rate of landfill gas cannot be improved due to the high water level of the garbage dump, which is common in domestic garbage landfills, an object of the present invention is to provide a method for collecting landfill gas by conducting drainage, which can improve the efficiency of the landfill gas inside the landfill. Excess water is effectively guided and drained, the collection rate of landfill gas is improved, and the stability of the garbage dump is strengthened

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