Study on reclamation method for a sanitary landfill with environmental problem by semi-aerobic structures

存在环境问题的卫生填埋场半好氧结构复垦方法研究

基本信息

批准号：
18560527
负责人：
YOSHIDA Hideki
金额：
$ 2.51万
依托单位：
Muroran Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560527/
关键词：
sanitary landfill semi aerobic landfill gas temperature aerobic biodegradation anaerobic biodegradation simulation

项目摘要

This research examines to measure temperatures and landfill gas components in passive landfill gas extraction wells of a closed landfill and evaluate the effect of the wells for accelerate the stabilization of the landfill. Several wells show the high temperature profile and low methane gas concentration. Especially the temperatures rose up to 60 degrees and high concentration of carbon dioxide was detected. This means active aerobic biodegradation occurred. Then the temperature declined and the gas composition was 71% of nitrogen and 29% of oxygen (like as the air). So the area around this well has stabilized. However, most of the wells show the high concentration of methane (more than 10%) and low temperatures (less than 25 degrees) and anaerobic biodegradation is dominant. Through observations of temperatures and landfill gas components passive landfill gas extraction wells hardly contribute to active aerobic biodegradation in this landfill body. Landfill gas profile in several wells shows the higher concentration of methane and the lower concentration of oxygen in vertical direction.Finally landfill gas transport phenomena simulated by numerical method. The method includes convection, diffusion and generation of landfill gas. Landfill gas profile is well presented by this simulation. The well may contribute to extraction of landfill gas generated in the landfill body. Nearly 10m in radial direction is the area of landfill gas collection by the well. The simulation shows the concentration of methane may decrease and the concentration of carbon dioxide may increase by the well.

这项研究研究了封闭垃圾填埋场的被动垃圾填埋气提取井中的温度和垃圾填埋气组件，并评估井的效果，以加速垃圾填埋场的稳定。几个井显示高温剖面和低甲烷气体浓度。特别是检测到高浓度的二氧化碳的温度上升到60度。这意味着发生了活跃的有氧生物降解。然后，温度下降，气体成分为氮的71％和29％的氧气（如空气）。因此，这孔周围的区域稳定了。但是，大多数井都显示出高浓度的甲烷（超过10％）和低温（小于25度），并且厌氧生物降解是显性的。通过观察温度和垃圾填埋气组件，无源垃圾填埋气井井几乎不会有助于该垃圾填埋场的活跃有氧生物降解。几个井中的垃圾填埋气谱显示，甲烷的浓度较高，氧气沿垂直方向较低。通过数值方法模拟的最终垃圾填埋场气体转运现象。该方法包括对流，扩散和垃圾填埋气的产生。该模拟很好地介绍了垃圾填埋场气体。该井可能有助于提取垃圾填埋场产生的垃圾填埋气。在径向方向上近10m是井收集垃圾填埋气的区域。模拟显示甲烷的浓度可能会降低，二氧化碳的浓度可能会增加井。