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Examining The Alternatives

机译：检查替代方案

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As the United States strives to find ways to contain the enormous volumes of solid waste it sends to landfills each day, engineers struggle to design better covers for those landfills that have reached their capacities and are about to be closed. Covers for final closure physically separate the waste from the environment, minimize odors, improve aesthetics, and control the percolation of precipitation into the waste. Controlling percolation minimizes the generation of both leachate and landfill gas, the two primary forms in which dangerous contaminants are released by landfills into the environment. Conventional covers as prescribed by the U.S. Resource Conservation and Recovery Act (RCRA), which governs the closure of many landfills, rely on such hydraulic barriers as geomembranes, geosynthetic clay liners, compacted clay layers, or combinations thereof to prevent water from flowing into the landfill. But a relatively new option―the alternative earthen final cover (AEFC)―is being considered as a solution that is both more natural and more cost effective. The design of these covers is intended to balance the capacity of finely textured soils that store infiltrating precipitation with the ability of plants and the atmosphere to remove stored water.
机译：随着美国努力寻找方法来遏制每天发送到垃圾填埋场的大量固体废物，工程师们努力为那些已达到其容量并即将关闭的垃圾填埋场设计更好的掩盖物。最终封闭的盖子将废物与环境物理隔离，最大程度地减少了气味，改善了美观，并控制了沉淀物渗入废物。控制渗滤可最大程度地减少渗滤液和垃圾填埋气的产生，这是垃圾填埋场将危险污染物释放到环境中的两种主要形式。美国资源保护和恢复法（RCRA）规定了许多掩埋场的封闭的常规覆盖物，依靠诸如土工膜，土工合成粘土衬里，压实粘土层或它们的组合等水力屏障来防止水流进垃圾填埋场。垃圾填埋场。但是，一种相对较新的选择-替代土质最终覆盖面（AEFC）-被认为是一种更自然，更具成本效益的解决方案。这些覆盖物的设计旨在平衡储存渗透性降水的质地细密的土壤与植物和大气层去除储存水的能力之间的平衡。

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