A two-way gas collection system for urban landfills

Abstract

The invention discloses an urban landfill of a bidirectional gas collecting system. The urban landfill comprises a plurality of vertical gas collecting pipes, a plurality of horizontal gas collecting pipes and a leachate collection pond. A plurality of vent holes are formed in a pipe body of each vertical gas collecting pipe, and the vertical gas collecting pipes are arranged in the vertical direction of the landfill at equal distance and can collect gas. The horizontal gas collecting pipes communicate with the vertical gas collecting pipes through four-directional pipeline connectors, a plurality of vent holes are formed in a pipe body of each horizontal gas collecting pipe, and the multiple horizontal gas collecting pipes are arranged in the middle of the landfill and can collect gas when the vertical gas collecting pipes cannot collect gas conveniently. The leachate collection pond is arranged on the lower portion of the middle position of the landfill, slopes are arranged on the periphery of the leachate collection pond, and the leachate collection pond can collect leachate fast. The bidirectional gas collecting system is applied in the landfill for garbage collection and can collect gas in the horizontal direction and the vertical direction at the same time, and the gas collecting efficiency is improved; and the gas collecting pipes are stressed in a criss-cross manner so that uniformity can be achieved, the service life period of the gas collecting system is prolonged, and the gas collecting system is suitable for collecting gas in the large garbage landfill.

Description

technical field [0001] The invention relates to an urban landfill with a two-way gas collection system, which belongs to the field of garbage landfill. Background technique [0002] Landfill is an ancient method of dealing with domestic waste that has been continuously used by humans. In my country, most of the municipal solid waste is collected centrally and then transported to one or more landfill plants owned by the local city government for landfill treatment. Landfill gas is a mixed gas continuously produced during the biodegradation process of urban solid waste gas and solid waste, mainly including methane, nitrogen, hydrogen and carbon dioxide. Among them, both methane and carbon dioxide are greenhouse gases, and methane is prone to fire and explosion when its volume concentration reaches 5% to 15% under aerobic conditions. In addition, if the landfill gas is not collected properly, the high air pressure in the landfill will also lead to instability and destruction ...

AI Technical Summary

Problems solved by technology

In order to effectively recover landfill gas, the traditional method mostly adopts the vertical collection method, which is collected by arranging vertical shafts and then applying negative pressure for pumping. , the gas collection radius is relatively large, but this method can only achieve the best effect after the landfill is closed, and in some cases the landfill operator needs to recover the landfill gas before the closure. Vertical collection cannot meet the requirements of gas collection in garbage dumps. At this time, horizontal blind ditch wells are needed to achieve the purpose of gas collection

[0004] Since the impact on the gas collection effect at the upper and lower ends of the landfill is relatively low, the horizontal blind ditch wells do not need to be arranged in all vertical directions, and the horizontal blind ditch wells are concentrated in the middle of the landfill. There are horizontal gas collecting pipes in the well. When the distance between the upper and lower gas collecting pipes is too large, the number of gas collecting holes will be insufficient, which will affect the gas collecting efficiency, increase the working time, and reduce the working efficiency. When the distance between the upper and lower gas collecting pipes is too small, the gas collecting , affecting the amount of landfill waste and the total carbon content, so it is necessary to reasonably set the distance between the upper and lower horizontal gas collectors

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