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Assessment ofgroundwatercontamination bynitrates associatedwith wastewaterirrigation: A casestudy in Shijiazhuangregion, China Caihong TangJ. ChenSoji Shindo2004 год

Assessment of groundwater contamination by nitrates associated with wastewater irrigation: A case study in Shijiazhuang region, China
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Аннотация: Abstract In arid and semi‐arid regions there is usually a shortage of irrigation water; thus, wastewater water, as well as other low‐quality water resources, may become an important source of water and nutrients. However, (pre)treated wastewater may contain elements and compounds that can damage the environment. It also has the potential to affect water quality adversely in an aquifer that may be the source of drinking water in the area. In order to assess the impacts of wastewater on the environment, groundwater samples were taken and analysed in typical croplands in the North China Plain, where urban wastewater or groundwater have been used for irrigation for several decades. Concentrations of nitrate (NO 3 − ) in groundwater in the study area varied from 50 to 130 mg l −1 in the croplands irrigated by wastewater, but in the croplands irrigated by pumping wells, away from the Dongming Canal, NO 3 − concentrations are less than 35 mg l −1 . It was found that values of δ 15 N ranged from +5 to +13‰, and dominantly from +7 to +11‰, and the NO 3 − concentration in most wells with depths of less than 40 m was higher than the drinking water standard set by the WHO. Cluster analysis was used to classify the spatial distribution of nitrates resulting from the wastewater. Identification of chemical patterns is found to be effective for the comprehensive assessment of the spatial distribution of groundwater quality. It is also emphasized that the wastewater in this area controls the NO 3 − distribution in the groundwater, and should be used carefully to protect both soil and groundwater from NO 3 − pollution. Copyright © 2004 John Wiley & Sons, Ltd.
Год издания: 2004
Авторы: Caihong Tang, J. Chen, Soji Shindo, Y. Sakura, Weijun Zhang, Yanjun Shen
Издательство: Wiley
Источник: Hydrological Processes
Ключевые слова: Groundwater and Isotope Geochemistry, Water Quality and Pollution Assessment, Water Treatment and Disinfection