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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 PERFORMANCE DEMONSTRATION OF AN ALTERNATIVE COMPOSITE LINER AT A MUNICIPAL SOLID WASTE LANDFILL
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LINER PERFORMANCE DEMONSTRATION OF AN ALTERNATIVE COMPOSITE LINER AT A MUNICIPAL SOLID WASTE LANDFILL

机译：市政固体垃圾填埋场上交替复合衬里的衬里性能演示

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This paper presents the liner performance demonstration performed for a Subtitle D alternative composite liner proposed for a 153-acre (61.9-ha) expansion at the Bakersfield Metropolitan (Bena) Sanitary Landfill in Bakersfield, California. The Bena Sanitary Landfill is operated by the Kern County Waste Management Department (KCWMD). This paper summarizes the regulatory background, the site characterization, and computer modeling using the U.S. EPA's Multimedia Exposure Assessment (MULTIMED) model. This paper also presents the results of the liner performance demonstration, that are required by regulatory agencies as a condition for final approval of the liner system. In April 2001, the Central Valley California Regional Water Quality Control Board (RWQCB) put all landfill owners on notice that henceforth all applications for landfill construction would require a demonstration that the proposed liner system meet state groundwater protection standards, even if the prescriptive Federal Subtitle D liner system was employed. The performance demonstration was to employ site-specific geology, hydrogeology, waste, and leachate characteristics. The work presented in this paper describes this performance demonstration for the Subtitle D alternative composite liner system proposed for the Bena Sanitary Landfill. Site characterization included evaluation of geologic and hydrogeologic site conditions and waste and leachate characteristics to derive properties and input values for MULTIMED modeling, including porosity, aquifer thickness, groundwater gradient, saturated and unsaturated zone hydraulic conductivity, waste characterization, and leachate chemistry. The leachate chemistry evaluation identified the landfill-related constituents that posed a threat to groundwater quality (i.e., compounds with low concentration limits, high concentrations in leachate, and/or high mobility) for use in the MULTIMED modeling. These evaluations were incorporated into the MULTIMED model to perform a site-specific analysis of the subsurface transport of landfill-related constituents to the point of compliance. Conservative input parameters for the MULTIMED computer modeling were selected in order to produce "worst-case" concentration levels at the point of compliance. These "worst-case" results indicate that the calculated dilution-attenuation factor (DAF) from MULTIMED is approximately 448 times higher than the DAF value of 100 recommended by the U.S. EPA for Subtitle D landfills. Based on these MULTMED results, it was demonstrated that the alternative composite liner proposed for the Bena Sanitary Landfill is capable of preventing degradation of waters of the state as a result of waste discharges to the landfill.
机译：本文介绍了对字幕D替代复合衬管进行的衬管性能演示，该复合衬管提议在加利福尼亚州贝克斯菲尔德的贝克斯菲尔德都市（贝纳）卫生垃圾填埋场扩建153英亩（61.9公顷）。贝纳卫生垃圾填埋场由克恩县废物管理部门（KCWMD）运营。本文总结了使用美国EPA的多媒体暴露评估（MULTIMED）模型进行监管的背景，场地特征和计算机建模。本文还介绍了衬管性能演示的结果，监管机构将其作为衬管系统最终批准的条件。 2001年4月，加利福尼亚中央山谷地区水质控制委员会（RWQCB）通知所有垃圾填埋场所有人，从此以后所有填埋场建设申请都需要证明拟议的衬砌系统符合州地下水保护标准，即使规定性的联邦字幕也是如此。使用了D衬垫系统。性能演示是利用特定地点的地质，水文地质，废物和渗滤液特征。本文介绍的工作描述了为Bena卫生垃圾填埋场提议的Subtitle D替代复合衬里系统的性能演示。场地特征包括评估地质和水文地质条件以及废物和渗滤液特征，以得出MULTIMED模型的属性和输入值，包括孔隙度，含水层厚度，地下水梯度，饱和和不饱和区水力传导率，废物特征以及渗滤液化学性质。渗滤液化学评估确定了与垃圾填埋场有关的成分，这些成分对地下水质量构成威胁（即，低浓度限值，渗滤液中高浓度和/或高迁移率的化合物），可用于MULTIMED模型。这些评估被合并到MULTIMED模型中，以对填埋场相关成分的地下运输进行现场分析，直至达到合规点。选择MULTIMED计算机建模的保守输入参数，以便在合规点产生“最坏情况”的浓度水平。这些“最坏情况”的结果表明，从MULTIMED计算得出的稀释衰减系数（DAF）大约比美国EPA为字幕D垃圾填埋场推荐的DAF值100高448倍。基于这些MULTMED结果，证明了为Bena卫生垃圾填埋场提议的替代复合衬里能够防止由于废物排放到垃圾填埋场而导致该州的水质退化。

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