Replication data for: Groundwater contamination from a municipal landfill: Effect of age, landfill closure, and season on groundwater chemistry

This dataset contains data collected to study "Groundwater contamination from a municipal landfill: Effect of age, landfill closure, and season on groundwater chemistry". Groundwater samples were collected seasonally and analysed for 28 physicochemical parameters; temperature, pH, electrical conductivity, dissolved oxygen, potassium, sodium, ammonium, calcium, magnesium, iron, manganese, cadmium, chromium, copper, lead, nickel, zinc, mercury, chloride, sulphate, bicarbonate, nitrate, nitrite, total nitrogen, total phosphorous, total organic carbon, polychlorinated biphenyls (PCB7) and polycyclic aromatic hydrocarbons (PAH16).
Article Abstract - Related PublicationGroundwater reservoirs continue to be threatened globally, mainly from anthropogenic activities. There is need to understand how remediation of groundwater can be influenced by site-specific factors. There are few studies, if any, that incorporate at least three site-specific factors in a single investigation of groundwater contamination from landfills. We report a study where waste age, landfill closure, and season were compared with changes in water quality, using a twenty-four-year groundwater chemistry dataset. Groundwater samples were extracted from monitoring wells and analysed for twenty-eight physicochemical parameters. Results showed discharge of both legacy pollutants and elevated inorganic pollutants into the groundwater. Among the site-specific factors, waste age was the most influential. At the landfill age of 21 years, concentrations of pollutants became close to the reference value. The result also indicated that closing the landfill caused significant decrease in concentrations of contaminants in the groundwater (P < 0.05). Season was the least influential, registering significant results only for dissolved oxygen, sulphate and chloride (P < 0.05). Lastly, the result showed strong attenuation of pollutants with distance, thereby demonstrating the feasibility of the aquifer acting as a natural treatment plant to the pollutants. This eliminates any serious environmental risk associated with the emanating leachate, but at a cost of prohibiting abstraction of the groundwater for human use, due to potential health risks.

本数据集包含为研究"城市垃圾填埋场地下水污染：填埋年限、填埋场封场与季节对地下水化学特征的影响"所采集的实测数据。研究人员按季节采集地下水样本，并对28项理化参数开展分析，具体包括：温度、pH值、电导率、溶解氧、钾、钠、铵、钙、镁、铁、锰、镉、铬、铜、铅、镍、锌、汞、氯化物、硫酸盐、碳酸氢盐、硝酸盐、亚硝酸盐、总氮、总磷、总有机碳、多氯联苯（polychlorinated biphenyls, PCB7）以及多环芳烃（polycyclic aromatic hydrocarbons, PAH16）。

相关出版物：论文摘要
全球地下水储层仍持续面临威胁，其主要诱因为人为活动。当前亟需明确场地特异性因素如何影响地下水修复效果。目前鲜有（若存在）研究在单次垃圾填埋场地下水污染调查中同时纳入至少3项场地特异性因素。本研究依托24年的地下水化学数据集，对比分析了垃圾填埋场废物填埋年限、填埋场封场状态与季节变化对水质的影响。研究人员从监测井中抽取地下水样本，对28项理化参数进行检测分析。结果显示，地下水中同时存在遗留污染物与浓度升高的无机污染物。在各类场地特异性因素中，废物填埋年限的影响最为显著：当填埋场运行至21年时，污染物浓度已接近参考值。研究同时发现，填埋场封场可显著降低地下水中的污染物浓度（P < 0.05）。季节因素的影响最弱，仅对溶解氧、硫酸盐与氯化物产生显著影响（P < 0.05）。最后，研究结果表明污染物浓度随距离增加呈现显著衰减，这证明含水层可作为污染物的天然处理设施，具备可行性。该结果可消除渗滤液泄漏相关的严重环境风险，但由于存在潜在健康风险，该区域地下水仍被禁止用于人类取水活动。