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首页> 美国卫生研究院文献>Heliyon >Geological and geophysical assessment of groundwater contamination at the Roundhill landfill site Berlin Eastern Cape South Africa
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Geological and geophysical assessment of groundwater contamination at the Roundhill landfill site Berlin Eastern Cape South Africa

机译：南非东开普省柏林Roundhill垃圾填埋场的地下水污染地质和地球物理评估

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摘要

An integrated geological assessment of groundwater contamination was carried out to determine the nature of the subsurface as well as establish linkages between groundwater and contaminants in the vicinity of the Roundhill landfill, South Africa. Quantitative analysis involved measurement of physico-chemical properties of groundwater samples from two boreholes and a leachate pond within the landfill. Qualitative assessment involved combined measurements of electrical resistivity and time domain induced polarization (IP) across three profiles, using the double-dipole array. The physico-chemical analysis results show the presence of heavy metals (i.e.mercury, lead and arsenic) in groundwater samples in concentrations above the general acceptable limits. Perhaps, the high concentration of these metals could be due to the dumping of toxic and hazardous waste substances on the landfill, contrary to the landfill design and classification. Resistivity and IP pseudo-sections revealed a 4-layered earth structure and anomalous zones of resistivity (≤112 Ω-m) and low chargeability (≤1.25 ms) in the top layers. This is indicative of percolating leachate plume in the unsaturated zone. Despite the fact that layer lithologies and stratigraphy pose low risk to groundwater contamination, structural controls such as fractures in the bedrock are favourably disposed to the percolation of contaminants into the groundwater over time. Proper waste classification and inspection should be carried out on the landfill prior to waste disposal.
机译：进行了地下水污染的综合地质评估，以确定地下的性质，并在南非Roundhill垃圾填埋场附近建立地下水与污染物之间的联系。定量分析涉及测量垃圾场中两个钻孔和一个渗滤液池中地下水样品的理化性质。定性评估涉及使用双偶极子阵列对三个剖面上的电阻率和时域感应极化（IP）进行组合测量。物理化学分析结果表明，地下水样品中的重金属（即汞，铅和砷）的含量高于一般可接受的限值。也许这些金属的高浓度可能是由于有毒有害废物倾倒在垃圾填埋场，与垃圾填埋场的设计和分类相反。电阻率和IP伪截面显示出一个4层的地球结构以及顶层的电阻率（≤112Ω-m）和低充电率（≤1.25ms）的异常区域。这表明渗滤液羽流在不饱和区渗出。尽管事实是层岩性和地层对地下水污染的风险很小，但随着时间的流逝，基岩裂缝等结构控制措施有利于污染物渗入地下水。在处置废物之前，应对垃圾填埋场进行正确的废物分类和检查。

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