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Groundwater is important for the geochemical cycling of phosphorus in rapidly urbanized areas: a case study in the Pearl River Delta.
Environmental Pollution ( IF 8.9 ) Pub Date : 2020-01-25 , DOI: 10.1016/j.envpol.2020.114079
Guanxing Huang 1 , Chunyan Liu 2 , Ying Zhang 2 , Zongyu Chen 2
Affiliation  

The fate of phosphorus in groundwater needs to be understood because phosphorus-rich groundwater is discharged into surface water bodies, which causes eutrophication, especially in urbanized areas. The present study investigated the spatial distributions and driving forces related to the groundwater phosphate levels in various aquifers in the Pearl River Delta (PRD), which has undergone three decades of urbanization, as well as the relationship between groundwater phosphate and arsenic was also discussed. The results showed that most of the high-phosphate (>1.53 mg/L) groundwater occurred in granular aquifers. The proportion of high-phosphate groundwater in granular aquifers was more than four times that in fissured aquifers, whereas high-phosphate groundwater was not observed in karst aquifers in the PRD. High-phosphate groundwater primarily occurred in urbanized areas in the PRD, and the proportion of high-phosphate groundwater had a significant positive correlation with the urbanization level. In granular aquifers, reductive environment and alkalization led to enrichment of the groundwater with phosphate. Anthropogenic sources such as wastewater from township-village enterprises (TVE) and animal wastes were the main sources of high-phosphate groundwater in urbanized areas, and the external input of phosphate enriched the groundwater arsenic levels in urbanized areas. By contrast, geogenic sources such as the release of phosphate from the reduction of Fe/Mn (hydr)oxides and the seawater intrusion accompanied by the release of phosphate from secondary minerals were mainly responsible for the occurrence of high-phosphate groundwater in peri-urban and non-urbanized areas, respectively. The high concentrations of both phosphate and arsenic in groundwater in fissured aquifers were mainly attributed to the infiltration of wastewater from TVEs. In contrast to the granular aquifers, the groundwater Eh and pH conditions were not conductive to the occurrence of high-phosphate groundwater in fissured aquifers.



中文翻译:

地下水对于快速城市化地区磷的地球化学循环至关重要:以珠江三角洲为例。

需要理解地下水中磷的命运,因为富含磷的地下水排放到地表水体中,这会引起富营养化,特别是在城市地区。本研究调查了经历了三十年城市化的珠江三角洲(PRD)各个含水层中与地下水磷水平相关的空间分布和驱动力,并探讨了地下水磷与砷之间的关系。结果表明,大多数高磷酸盐(> 1.53 mg / L)地下水都发生在颗粒含水层中。珠三角含水层中高磷酸盐地下水的比例是裂隙含水层的四倍以上,而珠三角岩溶含水层中未发现高磷酸盐地下水。高磷地下水主要发生在珠三角的城市化地区,高磷地下水的比例与城市化水平呈显着正相关。在粒状含水层中,还原性环境和碱化导致地下水中富含磷酸盐。城镇村企业废水(TVE)和动物粪便等人为来源是城市化地区高磷地下水的主要来源,磷酸盐的外部输入丰富了城市化地区的地下水砷含量。相比之下,诸如Fe / Mn(氢)氧化物还原过程中释放的磷酸盐以及海水入侵以及次生矿物中释放的磷酸盐等地质来源,主要是造成城郊和非郊区高磷酸盐地下水的发生的原因。城市化地区。裂隙含水层中地下水中磷酸盐和砷的高浓度主要归因于乡镇企业的废水渗透。与粒状含水层相比,地下水Eh和pH条件不利于裂隙含水层中高磷酸盐地下水的产生。

更新日期:2020-01-26
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