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首页> 外文会议>The Solid Waste Association of North America~(~R) 7th Annual Landfill Symposium Jun 17-19, 2002 Louisville, Kentucky >LINER EFFICIENCY IMPROVEMENTS USING A SOIL PROTECTIVE LAYER
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LINER EFFICIENCY IMPROVEMENTS USING A SOIL PROTECTIVE LAYER

机译：使用土壤保护层提高衬里效率

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摘要

Landfill liner designs typically have a leachate collection layer and protective layer above the primary liner to accomplish the functions of leachate removal and physical protection, respectively. Sometimes a thicker high-permeability layer accomplishes both functions. Environmental Protection Agency (EPA) rules prohibit more than 1-foot (30 cm) of leachate hydraulic head on the liner system; therefore, the leachate collection layer is typically placed next to the liner to encourage rapid removal of the leachate and thereby comply with the "less that one foot" rule. Southeastern Chester County Refuse Authority (SECCRA) Community Landfill designed its liner system with a relatively low permeability (1x10~(-5) cm/s) protective soil layer directly above the high-density polyethylene liner. The leachate collection system was installed above the protective layer. EPA minimum head requirements are met by placement of the leachate collection laterals to provide the combined functions of leachate removal and dewatering of the protective layer. SECCRA has two landfill cells: the North Cell, with traditional leachate collection layer directly above the primary liner and the South Cell, with protective cover directly above the liner. Both cells have secondary liner systems with a leak detection drainage layer below the primary liner. This allows for quantitative comparison of the leak detection volumes. EPA guidance considers 10 gallons per day an acceptable leak detection flow. SECCRA's flows are 2.1 gallons per acre per day in the North Cell, and 0.21 gallons per acre per day in the South Cell (two year average flow during non-construction operations). The reversal of the leachate collection and protective layers is the only change between the two landfill liner designs, which could impact leak detection flow. The South Cell is exhibiting a ten-fold improvement (decrease) in leak detection flow over the North Cell. This new design clearly outperforms its predecessor.
机译：垃圾填埋场衬里设计通常在主要衬里上方具有渗滤液收集层和保护层，以分别实现渗滤液去除和物理保护的功能。有时，较厚的高磁导率层可以完成这两个功能。环境保护署（EPA）的规定禁止在衬管系统上超过1英尺（30厘米）的渗滤液液压头；因此，渗滤液收集层通常放置在衬里旁边，以促进渗滤液的快速去除，从而符合“不到一只脚”的规定。东南切斯特县垃圾处理局（SECCRA）社区垃圾填埋场设计的衬里系统在高密度聚乙烯衬里正上方具有相对较低的渗透性（1x10〜（-5）cm / s）保护性土壤层。渗滤液收集系统安装在保护层上方。 EPA最低水头要求通过放置渗滤液收集侧管来满足，以提供渗滤液去除和保护层脱水的综合功能。 SECCRA有两个垃圾掩埋场：北部牢房，其传统渗滤液收集层直接位于主要衬层上方；南部牢房，其保护层位于衬层上方。两个单元都具有辅助衬管系统，在主衬管下方具有检漏排水层。这允许对泄漏检测量进行定量比较。 EPA指南认为每天10加仑的泄漏检测量是可以接受的。 SECCRA在北牢房的流量为每英亩每天2.1加仑，在南牢房的流量为每英亩每天0.21加仑（非建筑作业期间的两年平均流量）。渗滤液收集层和保护层的颠倒是两个垃圾填埋场衬里设计之间的唯一变化，这可能会影响泄漏检测流量。南电池在泄漏检测流量方面比北电池提高了十倍（减少）。这项新设计明显优于其前代产品。

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