华北典型回补区地下水中持久性和可迁移有机污染物的分布特征与环境风险

Distribution Characteristics and Environmental Risks of Persistent and Mobile Organic Compounds (PMOCs) in Groundwater of a Typical Recharge Area, North China

  • 摘要: 持久性和可迁移有机污染物(PMOCs)是一类难吸附和难降解的新污染物,易于在水体中迁移与富集,对水环境与公共健康具有潜在风险。滹沱河石家庄段作为典型的生态回补区,沿线污水处理厂再生水的汇入,可能成为PMOCs进入地下水系统的重要途径。为探究华北地区滹沱河石家庄段补水过程中地下水PMOCs的分布特征与风险,于2023—2025年分三期对地表水与地下水进行采样测试,综合运用水化学分析、主成分分析(PCA)与自组织映射(SOM)等方法,研究了三-(2-氯异丙基)磷酸酯(TCPP)、金刚烷胺(AMANT)、苄基三甲基氯化铵(BETMA)、己内酰胺(CAP)、对甲苯黄酰胺(PTSA)、安赛蜜(ACE)、糖精(SAC)、三氟甲烷磺酸(TFMSA)、双酚S(BPS)、硫酸甲酯(MS)共10种典型PMOCs的时空分布、来源及环境风险。结果表明:在持续回补期间,地下水∑PMOCs浓度与检出率总体呈波动下降趋势。其中,AMANT、PTSA和MS检出浓度较高,最大浓度分别为2616.70、5503.60和1427.41 ng/L;TCPP、AMANT、CAP和MS检出率均大于93%。地下水与对应回补断面中PMOCs的空间分布高度一致,且高浓度点位水化学特征均以Na+和Cl-富集为主。通过PCA与SOM分析进一步揭示,∑PMOCs与Na+、Cl-具有同源性,共同指向其再生水来源,正定及藁城段再生水汇入是影响PMOCs分布的关键因素。值得注意的是,再生水影响区地下水中AMANT和MS已呈现浓度累积趋势,建议加强再生水–地表水–地下水中PMOCs的协同监测与污染防控,保障水质安全。

     

    Abstract: Persistent and mobile organic compounds (PMOCs) are a class of emerging contaminants with high environmental persistence and mobility, posing significant risks to aquatic ecosystems and public health. The Hutuo River in Shijiazhuang is a typical ecological water recharge area, where the inflow of reclaimed water from wastewater treatment plants along the river can facilitate the infiltration of PMOCs into the groundwater system. To investigate the distribution, sources, and environmental risks of PMOCs in groundwater during the recharge process, surface water and groundwater samples were collected annually from 2023 to 2025 and analyzed using hydrochemical analysis, principal component analysis (PCA), and self-organizing maps (SOM). The results showed that all ten PMOCs, including tri-(2-chloroisopropyl)phosphate (TCPP), adamantan-1-amine (AMANT), benzyltrimethylam monium (BETMA), caprolactam (CAP), p-toluenesulfonamide (PTSA), acesulfame(K) (ACE), saccharine (SAC), trifluoromethanesulfonic acid (TFMSA), bisphenol S (BPS), (sodium) methyl sulfate (MS), were detected in groundwater during the recharge period, with total concentrations and detection frequencies both exhibiting a declining trend. Notably, AMANT, PTSA, and MS showed the highest maximum concentrations (2616.70, 5503.60 and 1427.41 ng/L, respectively). Meanwhile, TCPP, AMANT, CAP, and MS were the most frequently detected compounds, with the detection rates exceeding 93%. The distribution of PMOCs exhibited a strong correlation between surface water and groundwater. Groundwater hydrochemical types varied with PMOC pollution levels, with high concentrations samples clustering within Na+-Cl enriched zones on the Piper diagram. PCA revealed a significant correlation among Na+, Cl-, and ∑PMOCs, which was further corroborated by SOM analysis. These findings indicated that reclaimed water inflows from the Zhengding and Gaocheng sections were the key anthropogenic source governing the distribution of PMOCs. During the continuous recharge process, certain PMOCs (e.g., AMANT and MS) showed accumulation trends in groundwater within areas influenced by reclaimed water, highlighting the ecological risks of long-term exposure. Therefore, it is recommended to strengthen the integrated monitoring and pollution control of PMOCs across reclaimed water, surface water, and groundwater to ensure water quality safety.

     

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