Kim H J, Endo D, Sato M, Matsuo T, Matsuto T
Laboratory of Solid Waste Disposal Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
Waste Manag. 2009 Aug;29(8):2308-15. doi: 10.1016/j.wasman.2009.03.011. Epub 2009 Apr 7.
Leachate accumulated at the Nakazono Landfill in Asahikawa, Japan due to an inadequate leachate collection and drainage system. To reduce the level of leachate in the landfill and promote the stabilization of waste, many passive gas vents were installed in addition to leachate collection vaults. This study evaluated the distribution and movement of leachate in the landfill by measuring leachate levels and conducting tracer tests in the gas vents. Water levels varied widely among gas vents and depended mainly on the vent's original ground level and depth. Leachate velocity varied greatly; it was high in the upper layers of the saturated zone in a gas vent, but this was only a superficial velocity caused by inflow from unsaturated layers. A sharp decrease in total organic carbon observed in most gas vents after installation was likely due to the effect of aerobic biodegradation in the unsaturated waste layer. This effect was limited to a small aerobic zone around the gas vent.
由于渗滤液收集和排水系统不完善，日本旭川中野垃圾填埋场积累了渗滤液。为了降低垃圾填埋场中的渗滤液水位并促进废物的稳定化，除了渗滤液收集库外，还安装了许多被动式排气孔。本研究通过测量渗滤液水位并在排气孔中进行示踪剂测试，评估了垃圾填埋场中渗滤液的分布和流动情况。排气孔之间的水位差异很大，主要取决于排气孔的原始地面高度和深度。渗滤液流速变化很大；在排气孔饱和区的上层流速较高，但这只是由非饱和层流入引起的表面流速。安装后在大多数排气孔中观察到的总有机碳急剧下降，可能是由于非饱和废物层中好氧生物降解的作用。这种作用仅限于排气孔周围的一个小好氧区。
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