Two-step city life garbage landfilling treatment system and method thereof

Abstract

The invention discloses a two-step urban domestic waste landfill treatment system and method thereof. It divides the waste landfill process into two steps: rapid waste degradation, energy conversion, and final disposal of stabilized waste. The system is mainly composed of a rapid waste degradation unit, a gas collection and purification unit, and a final landfill unit. The rapid degradation unit consists of landfill operations. Unit, degradation and gas production unit, garbage stabilization unit, clinker excavation unit and idle unit to be filled, each unit is in a dynamic cycle, the garbage layer is relatively loose and full of water. The invention can significantly accelerate the degradation and stabilization process of urban domestic garbage, realize energy conversion of landfill gas, reduce air pollution, realize in-situ reduction of pollutants in landfill leachate, avoid groundwater pollution, and save landfill waste at the same time The effective landfill storage capacity and covering soil consumption of the site, and the final landfilled garbage is relatively stable, which can avoid uneven settlement and facilitate site closure management.

Description

technical field [0001] The invention relates to a two-step urban domestic garbage landfill treatment system and method thereof. Background technique [0002] Landfill leachate and greenhouse gas are two major pollutants produced during the landfill disposal of urban domestic waste. Under the traditional sanitary landfill method, the degradation of landfill waste is slow, and it takes dozens or even hundreds of years for the pile to stabilize. Therefore, if it is not handled properly, leachate and greenhouse gases will seriously endanger the ecological environment and human health for a long time. In order to reduce the adverse impact of landfills on the environment, the European Union has formulated a plan to gradually reduce the content of organic matter in garbage. By 2016, the amount of organic waste entering landfills will be reduced by 65% ​​compared with 1995. [0003] In the past 20 years, bioreactor landfill technology has been a research hotspot in this field, and ...

AI Technical Summary

Problems solved by technology

However, in practical applications, direct leachate recharge may cause some operational problems, such as localized water accumulation, clogging, and especially uneven settlement

Studies have proved that the optimal leachate recharge process required for rapid degradation of different cities and towns is different, so the choice of leachate recharge process is difficult

At the same time, the recharge of leachate can cause the garbage layer to be gradually compacted, which is not conducive to the diffusion of gas production, resulting in the accumulation of landfill gas in some areas of the garbage layer. Therefore, the landfill gas in the garbage layer often needs to be actively pumped to be collected.

At the same time, the landfill gas accumulation area is easy to form a short-flow area of ​​leachate, which greatly reduces the efficiency of leachate recharge

In actual landfill sites, the landfill operation period often lasts for a long time, during which a large amount of odor is discharged into the atmosphere. Even if the gas is collected after landfill, it is difficult to avoid the problem of landfill gas overflowing from the covering soil

Studies have shown that landfill waste can be quickly degraded under water-filled conditions, and the waste laminated too densely is not conducive to the degradation of waste

[0004] In short, there are many problems in the traditional landfill method and leachate recharge: (1) The degradation of organic matter is slow, the gas production lasts for a long time, the gas production is small and the release area is wide, and it is difficult to collect, so a large amount of landfill gas and odor are directly discharged into environment, destroying the atmosphere; at the same time, the loss of methane energy is serious

(2) Landfill waste cannot be stabilized for a long time, and waste degradation produces a large amount of leachate, which easily penetrates the anti-seepage layer and pollutes groundwater

(3) A large amount of covering soil needs to be consumed in the process of landfilling, causing serious damage to land resources and high transportation costs

(4) The mechanical stability of the landfill is poor: the heterogeneity of the waste can easily lead to uneven settlement of the landfill; in order to save the effective landfill storage capacity, the landfill waste is often compressed too densely, making it difficult for the gas in the pile to diffuse and accumulate, and Further hinder the degradation process of garbage in the pile

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