DII Department, University of Padua, Italy.
CNR-IRPI, National Research Council - Research Institute for Hydrogeological Protection, Via Amendola 122 I, 70126 Bari, Italy.
Waste Manag. 2018 Jul;77:156-165. doi: 10.1016/j.wasman.2018.05.014. Epub 2018 May 26.
Where the unique natural water resource is groundwater, the attention and the susceptibility of local communities and authorities to groundwater quality degradation risks can be so high to determine relevant problems to waste management, especially for landfills in operation or to be realised. A multi-methodological approach was suggested with the purpose to clarify the role of landfill leakage on groundwater quality degradation. The selected study area (SSA) hosts some landfills in a narrow portion of a wide and deep coastal karstic aquifer, for these characteristics to be considered a case of high hydrogeological complexity and vulnerability. News concerning nitrate and secondly iron groundwater concentration anomalously high caused concern in the population and strong local opposition to landfills. The multi-methodological approach includes: the hydrogeological site characterization; the chemical study and the multi-isotope characterization of groundwater and leachate; the land use analysis and the estimation of nitrogen contributions deriving from fertilizers; the mineralogical study of groundwater suspended particles to define the role of natural soil substances. The hydrogeological site characterisation highlighted the local peculiarities of the aquifer. The chemical study was used to define geochemical features, groundwater and leachate characteristics and their macroscopic mixing. The environmental isotopes of hydrogen, carbon, nitrogen, and oxygen were used to investigate the groundwater origin, the most relevant geochemical reactions, the existence of groundwater-leachate mixing, and the sources of anthropogenic NO. The land use analysis highlighted quantity and type of used fertilizers permitting to compare these with groundwater in terms of isotopic signature. The mineralogical study demonstrated the role of suspend natural particles due the presence of terre rosse (red or residual soils) in groundwater. The approach confirmed that there are not the groundwater quality degradation effects of landfills, contributing to reassure population and institutions, simplifying the waste management.
当地下水是独特的自然资源时，当地社区和当局对地下水质量退化风险的关注和敏感性可能非常高，这可能会决定与废物管理相关的问题，特别是对于正在运营或即将建设的垃圾填埋场。本研究提出了一种多方法的方法，目的是阐明垃圾填埋场渗漏对地下水质量退化的作用。所选的研究区域（SSA）在一个宽而深的沿海喀斯特含水层的狭窄部分中拥有一些垃圾填埋场，这些特征被认为是水文地质高度复杂和脆弱的情况。关于硝酸盐和其次是铁的地下水浓度异常高的消息引起了人们的关注，并引发了当地居民对垃圾填埋场的强烈反对。多方法的方法包括：水文地质场地特征描述；地下水和渗滤液的化学研究和多同位素特征描述；土地利用分析和肥料氮贡献的估算；地下水悬浮颗粒的矿物学研究，以确定天然土壤物质的作用。水文地质场地特征描述突出了含水层的局部特点。化学研究用于定义地球化学特征、地下水和渗滤液特征及其宏观混合。氢、碳、氮和氧的环境同位素用于研究地下水的来源、最相关的地球化学反应、地下水-渗滤液的混合以及人为 NO 的来源。土地利用分析突出了允许与地下水在同位素特征方面进行比较的肥料的数量和类型。矿物学研究证明了由于在地下水中存在红色土壤（红色或残余土壤），悬浮天然颗粒的作用。该方法证实了垃圾填埋场没有导致地下水质量退化的影响，这有助于使公众和机构放心，并简化废物管理。
