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.

本研究旨在测量封闭垃圾填埋场的被动垃圾填埋气体抽取井中的温度和填埋气体成分，并评估这些井对加速垃圾填埋场稳定的效果。几口井显示出高温剖面和低甲烷气体浓度。特别是气温高达60度，检测到高浓度的二氧化碳。这意味着发生了活跃的需氧生物降解。然后温度下降，气体成分为 71% 氮气和 29% 氧气（与空气一样）。所以这口井周围的区域已经稳定下来了。但大部分井甲烷浓度高（超过10%）、温度低（低于25度），厌氧生物降解占主导地位。通过对温度和垃圾填埋气成分的观察，被动式垃圾填埋气抽气井很难对该垃圾填埋场内的主动需氧生物降解做出贡献。多口井填埋气体剖面显示垂直方向甲烷浓度较高、氧气浓度较低。最后采用数值方法模拟了填埋气体输运现象。该方法包括垃圾填埋气的对流、扩散和产生。该模拟很好地呈现了垃圾填埋场气体分布。该井可以有助于提取在垃圾填埋场主体中产生的垃圾填埋气。径向近10m处为该井收集垃圾填埋气的区域。模拟显示井旁甲烷浓度可能降低，二氧化碳浓度可能增加。