Dávalos-Peña Ingrid, Fuentes-Rivas Rosa María, Fonseca-Montes de Oca Reyna María Guadalupe, Ramos-Leal José Alfredo, Morán-Ramírez Janete, Martínez Alva Germán
Geography Department, Autonomous University of the State of Mexico, Cerro de Coatepec s/n Ciudad Universitaria, Toluca 50110, Mexico.
Engineering Department, Autonomous University of the State of Mexico, Cerro de Coatepec s/n Ciudad Universitaria, Toluca 50110, Mexico.
Int J Environ Res Public Health. 2021 Oct 25;18(21):11195. doi: 10.3390/ijerph182111195.
Sanitary landfills are considered one of the main sources of contamination of water resources due to the generation of leachate with a high content of dissolved organic matter (DOM), inorganic material, and toxic elements. This study aimed to determine the influence of leachate on the physicochemical quality and hydrogeochemical processes which determine the chemical composition of groundwater in an area near a municipal sanitary landfill site. In situ parameters (pH, temperature, electrical conductivity, dissolved oxygen, ORP), physicochemical parameters (HCO, PO, Cl, NO, SO, NH, Ca, Mg, Na, K), and dissolved organic matter were analyzed. The content of dissolved organic matter (DOM) was determined by 3D fluorescence microscopy. The presence of Cl, NO, NH, PO, BOD, and COD indicated the presence of contamination. The significant correlation between NO and PO ions (r = 0.940) and DOM of anthropogenic origin in the 3D fluorescence spectra confirm that its presence in the water is associated with the municipal landfill site in question. The type of water in the area is Mg-HCO, with a tendency to Na-HCO and Na-SO-Cl. The water-rock interaction process predominates in the chemical composition of water; however, significant correlations between Na and Ca (r = 0.876), and between K and Mg (r = 0.980) showed that an ion exchange process had taken place. Likewise, there is enrichment by HCO and SO ions due to the mineralization of the organic matter from the leachate. The groundwater quality that supplies the study area is being affected by leachate infiltration from the sanitary landfill.
由于产生的渗滤液含有高含量的溶解有机物（DOM）、无机物质和有毒元素，卫生填埋场被认为是水资源污染的主要来源之一。本研究旨在确定渗滤液对物理化学性质和水文地球化学过程的影响，这些过程决定了市政卫生填埋场附近地区地下水的化学成分。分析了现场参数（pH值、温度、电导率、溶解氧、氧化还原电位）、物理化学参数（HCO、PO、Cl、NO、SO、NH、Ca、Mg、Na、K）和溶解有机物。通过三维荧光显微镜测定溶解有机物（DOM）的含量。Cl、NO、NH、PO、生化需氧量（BOD）和化学需氧量（COD）的存在表明存在污染。三维荧光光谱中NO和PO离子之间的显著相关性（r = 0.940）以及人为来源的DOM证实，其在水中的存在与所讨论的市政垃圾填埋场有关。该地区的水类型为Mg-HCO，有向Na-HCO和Na-SO-Cl转变的趋势。水岩相互作用过程在水的化学成分中占主导地位；然而，Na和Ca之间（r = 0.876）以及K和Mg之间（r = 0.980）的显著相关性表明发生了离子交换过程。同样，由于渗滤液中有机物的矿化作用，HCO和SO离子也有富集现象。供应研究区域的地下水质量正受到卫生填埋场渗滤液渗入的影响。
