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Geochemistry of an abandoned landfill containing coal combustion waste: implications for remediation

机译：含煤燃烧废弃物的废弃垃圾填埋场的地球化学：对修复的影响

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The 488-D Ash Basin (488-DAB) is an unlined, earthen landfill containing approximately one million tons of dry ash and coal reject material at the U.S. Department of Energy's Savannah River Site, SC. The pyritic nature of the coal rejects has resulted in the formation of acidic drainage (AD), which has contributed to groundwater deterioration and threatened biota in adjacent wetlands. Establishment of a dry cover is being examined as a remedial alternative for reducing AD generation within this system by minimizing the contact of oxygen and water to the waste material. To determine the potential benefit of a cover on pore water chemistry, a series of flow-through column experiments were performed under varying environmental conditions using materials from the site. The experiment was designed to demonstrate the influence of temperature, gaseous composition (dissolved nitrogen vs. oxygen), and flow regime (continuous flow vs. episodic wetting/drying) on effluent chemistry. Results indicated that the fluid composition (e.g., pH, redox, elemental composition) was closely associated to dissolved and/or gaseous oxygen content and wetting regime. Given these conditions, the use of a dry cover could reduce the production of acid lechate over time, pending that it retards or eliminates fluid and oxygen transport to the subsurface.
机译：488-D灰盆地（488-DAB）是一款非线垃圾填埋场，美国能源部大草原河站SC的大约一百万吨干灰和煤炭拒绝材料。煤炭拒绝的酸性性质导致形成酸性排水（AD），这导致了邻近湿地的地下水劣化和威胁生物群。通过最小化氧气和水与废料的接触，将制备干盖的建立作为减少该系统内的广告的补救替代方案。为了确定孔隙水化学上盖子的潜在益处，通过从现场的材料改变环境条件下进行一系列流通柱实验。该实验旨在证明温度，气态组合物（溶解氮气与氧气）和流出制度（连续流动对湿湿润/干燥）对流出物化学的影响。结果表明，流体组合物（例如，pH，氧化还原，元素组合物）与溶解和/或气态氧含量和润湿性能密切相关。鉴于这些条件，使用干覆盖可以随着时间的推移减少酸的生产，因此延迟或消除了流体和氧气到地下的酸性和氧气运输。

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