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首页> 外文期刊>Environmental Science and Pollution Research >Impact of on-site sanitation systems on groundwater sources in a coastal aquifer in Chennai, India
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Impact of on-site sanitation systems on groundwater sources in a coastal aquifer in Chennai, India

机译：印度钦奈沿海含水层地下水源对地下水源的影响

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On-site sanitation is the most preferred mode of sanitation due to expensive off-site sanitation. The increasing population especially in the peri-urban areas has led to increasing use of on-site sanitation systems in India. However, the habitations in the vicinity of these systems do not have centralised water supply and are dependent on groundwater sources. However, there is concern about leaching of faecal coliforms and nitrate from the septic tanks to the underlying aquifer. The present study is attempted at two sites in the coastal city of Chennai where on-site sanitation is prevailing. The sample locations (16 nos.) are selected in such a way that groundwater sources are situated in the vicinity of on-site sanitation systems. The groundwater sources are the bore wells installed by the private agencies. It is observed that parameters considered key parameters to study the impact of the on-site sanitation systems, namely Na2(+), Cl-, NO3-, faecal coliform and total dissolved solids, exceed the concentration limits recommended by the Bureau of Indian Standards. The piper diagram analysis identifies that the predominant cations and anions are respectively Na+, and Cl-, SO4- and HCO3-.The Gibbs plot shows ground water quality is dominated by the evaporation process in both the seasons. The Cl/HCO3 ratio in many samples confirms the seawater intrusion in the study area. Elevated concentrations of faecal coliforms in all the samples (16 nos.) confirm the significant amount of groundwater pollution from the on-site sanitation systems. It is desired that policy planners and implementation agencies should undertake detailed scientific and hydrogeological studies of the region in order to examine the feasibility of implementing on-site sanitation systems.
机译：由于昂贵的非现场卫生设施，现场卫生是最优选的卫生模式。人口尤其在围城区的增加导致了印度的现场卫生系统的使用。然而，这些系统附近的习惯没有集中供水，依赖于地下水来源。然而，有人担心粪便大肠菌群和硝酸盐从化粪池到下面的含水层的浸出。目前的研究是在沿海城市钦奈沿海城市的两个地点进行了现场卫生。采样位置（16号）以这样的方式选择地下水源位于现场卫生系统附近。地下水来源是私营机构安装的孔井。观察到参数认为，研究现场卫生系统的影响，即Na2（+），Cl-，No3-，粪便大肠杆菌和总溶解固体的关键参数，超过印度标准局推荐的浓度限制。吹笛者图分析识别出主要的阳离子和阴离子分别是Na +，以及Cl-，SO4-和HCO3-。Gibbs Plot显示地面水质量在两个季节中的蒸发过程中占主导地位。许多样品中的Cl / HCO3比率证实了研究区域的海水侵扰。所有样品中粪便大肠的升高浓度（16号）确认了现场卫生系统的大量地下水污染。希望政策规划者和实施机构应承接对该地区的详细科学和水文地质研究，以审查在现场卫生系统实施的可行性。

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