Graduate School of Engineering, Hokkaido University, Kita 13, Nishi 8, Kita-ku, Sapporo 060-8628, Japan.
Waste Manag. 2010 Mar;30(3):465-72. doi: 10.1016/j.wasman.2009.10.005. Epub 2009 Nov 10.
In a closed landfill, Japan, remedial actions have been undertaken to address the inadequate leachate collection and drainage systems. Part of this process included installing many passive gas vents in the landfill to promote stabilization of landfilled waste. This study focused on the gas velocity in vents by conducting tracer tests to elucidate the gas flow via passive gas vents. The gas composition and gas temperature in the vents was also measured. As the gas vents pass through the waste layer, both landfill gas and air flows through the vents. Therefore, passive gas vents can be used to aerate landfilled waste as well as to collect and release landfill gas. Aerobic biodegradation occurs when air migrates through the waste layer if organic matter is present; this increases the temperature of the waste layer. Inflow of air into the gas vents can occur at a wide range of depths, even 10-20 m below ground level. Air is induced not from the surface of the landfill, but horizontally along the waste layer. The driving force of air induction from outside is a buoyancy effect caused by the temperature rise due to aerobic biodegradation.
在封闭的垃圾填埋场中，日本采取了补救措施来解决渗滤液收集和排水系统不足的问题。这一过程的一部分包括在垃圾填埋场中安装许多被动式气体通风口，以促进填埋废物的稳定化。本研究通过示踪剂测试来关注通风口中的气体速度，以阐明通过被动式气体通风口的气体流动。还测量了通风口中的气体组成和气体温度。当气体通风口穿过废物层时，填埋气和空气都会流过通风口。因此，被动式气体通风口可用于为填埋废物充气，以及收集和释放填埋气。如果存在有机物，空气通过废物层迁移时会发生好氧生物降解，这会增加废物层的温度。空气可以从很宽的深度进入气体通风口，甚至在地面以下 10-20 米处。空气不是从垃圾填埋场表面吸入，而是沿着废物层水平吸入。空气吸入的驱动力是由于好氧生物降解引起的温度升高而产生的浮力效应。
