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首页> 外文会议>Waste management 2004 symposium (WM'04): waste management, energy security and a clean environment >DESIGN,INSTALLATION,AND PERFORMANCE OF A MULTI-LAYERED PERMEABLE REACTIVE BARRIER,LOS ALAMOS NATIONAL LABORATORY
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DESIGN,INSTALLATION,AND PERFORMANCE OF A MULTI-LAYERED PERMEABLE REACTIVE BARRIER,LOS ALAMOS NATIONAL LABORATORY

机译：多层可渗透反应性屏障的设计，安装和性能LOS ALAMOS国家实验室

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A multi-layered permeable reactive barrier(PRB)has been installed in Mortandad Canyon,on the Pajarito Plateau in the north-central part of LANL,to demonstrate in-situ treatment of a suite of contaminants with dissimilar geochemical properties.The PRB will also mitigate possible vulnerabilities from downgradient contaminant movement within alluvial and deeper perched groundwater.Mortandad Canyon was selected as the location for this demonstration project because the flow of alluvial groundwater is constrained by the geology of the canyon,a large network of monitoring wells already were installed along the canyon reach,and the hydrochemistry and contaminant history of the canyon is well-documented. rnThe PRB uses a funnel-and-gate system with a series of four reactive media cells to immobilize or destroy contaminants present in alluvial groundwater,including strontium-90,plutonium-238,239,240, americium-241,perchlorate,and nitrate.The four cells,ordered by sequence of contact with the groundwater,consist of gravel-sized scoria(for colloid removal);phosphate rock containing apatite(for metals and radionuclides);pecan shells and cotton seed admixed with gravel(bio-barrier,to deplete dissolved oxygen and destroy potential RCRA organic compounds,nitrate and perchlorate);and limestone(pH buffering and anion adsorption).Design elements of the PRB are based on laboratory- scale treatability studies and on a field investigation of hydrologic,geochemical,and geotechnical parameters.The PRB was designed with the following criteria:1-day residence time within the bio- barrier,10-year lifetime,minimization of surface water infiltration and erosion,optimization of hydraulic capture,and minimization of excavated material requiring disposal.Each layer has been equipped with monitoring wells or ports to allow sampling of groundwater and reactive media,and monitor wells are located immediately adjacent to the up-and down-gradient perimeter of the engineered structure. rnGroundwater sampling upgradient,within,and downgradient of the PRB took place from May through August 2003.Concentrations of strontium-90 have diminished by 80%and 40%within the central portion of the phosphate rock(apatite)and bio-barrier cells,respectively.Higher concentrations of this radionuclide occur in groundwater near the north and south perimeters of the two cells.
机译：已在LANL中北部的Pajarito高原的Mortandad Canyon中安装了多层可渗透反应屏障（PRB），以演示原位处理一系列具有不同地球化学特性的污染物的方法。缓解冲积层和更深的地下水中污染物下降的可能的脆弱性。选择Mortandad Canyon作为该示范项目的地点，因为冲积层地下水的流动受到峡谷地质的限制，已经在沿岸安装了大型监测井网络峡谷到达，并且峡谷的水化学和污染物历史都有据可查。 rn PRB使用漏斗和闸门系统，该系统具有一系列四个反应介质池，用于固定或破坏冲积地下水中存在的污染物，包括锶90 、, 238,239,240，a 241，高氯酸盐和硝酸盐。按与地下水接触的顺序排列，包括砾石大小的渣（用于去除胶体）；含磷灰石的磷酸盐岩（用于金属和放射性核素）；山核桃壳和棉籽与砾石混合（生物屏障，用于消耗溶解氧和破坏潜在的RCRA有机化合物（硝酸盐和高氯酸盐）和石灰石（pH缓冲液和阴离子吸附剂）。PRB的设计要素是基于实验室规模的可处理性研究以及对水文，地球化学和岩土参数的现场调查。按照以下标准设计：在生物屏障中停留1天，寿命10年，最小化地表水的渗透和侵蚀，优化水力捕集，并最小化挖出的物料需要处理。每个层都配有监测井或端口，可对地下水和反应性介质进行采样，监测井紧邻工程结构的上下坡度周边。 rn从2003年5月至2003年8月，PRB的地下水采样出现了上升，下降的趋势。在磷酸盐岩（磷灰石）和生物屏障细胞的中部，锶90的浓度分别降低了80％和40％。这种放射性核素的浓度较高，出现在两个单元的南北边界附近的地下水中。

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