南方山谷型填埋场渗滤液产量及水位控制措施

在我国南方建成的第一批山谷型填埋场大多存在渗滤液产量大、堆体中渗滤液水位高的问题。基于对南方几个典型填埋场的现场调查和相关测试结果,从水量平衡的角度分析了影响山谷型填埋场渗滤液产量的关键因素,探讨了我国现有山谷型垃圾填埋场在渗滤液产量及水位控制方面存在的问题,并借鉴国内外相关工程经验教训提出了一些改进措施(包括采用带有垂直防渗体的截洪沟来控制场外汇水区域地下径流补给量、采用新型临时覆盖材料及工艺避免在堆体中形成渗滤液阻滞层、渗滤液收集与导排系统的防淤堵设计及淤堵反冲洗维护措施等)。

Control Measures for Leachate Generation Rate and Leachate Level at Valley-type Landfills in South China

High leachate generation rate and high leachate level were observed at most of the land-fills built in 1990s in south China. Based on the site investigation and field measurements at several typi-cal landfills, the key influence factors of leachate generation rate are analyzed from the perspective of wa-ter balance. The existing problems in the control of leachate generation rate and leachate level are dis-cussed, and some improvement measures are proposed on the basis of the engineering experiences at home and abroad, including the use of cut-off ditch with vertical curtain wall in the bottom to cut off the outer surface and subsurface runoff, the application of alternative cover materials to avoid the formation of leachate blockage layer, anti-clogging design and flushing of leachate collection and drainage system.