Groundwater contaminated with short-chain chlorinated paraffins and microbial responses
Groundwater contaminated with short-chain chlorinated paraffins and microbial responses
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短链氯化石蜡污染的地下水和微生物反应
DOI：
10.1016/j.watres.2021.117605
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发表时间：
2021-09-03
期刊：
影响因子：
12.8
通讯作者：
Wu，Wencheng
中科院分区：
文献类型：
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作者：
Wu，Yingxin;Wu，Jiahui;Wu，Wencheng
有毒和持久性短链氯化石蜡(SCCP)在土壤中的垂直迁移和微生物响应已有报道，但关于由此造成的地下水污染的数据很少。在这里，我们测定了氯化石蜡(CPS)生产厂地下地下水中短链氯化石蜡(SCCP)的浓度和同系物分布，并对微生物群落进行了表征，以探讨它们对短链氯化石蜡的响应。结果表明，短链氯化石蜡的质量比为70.3g/L，以C13-μ(11.2-65.8%)和Cl7-CPS(27.2-50.6%)为主。地下水中短链氯化石蜡与土壤中的分布规律相似，呈热点分布。CP合成是地下水中短链氯化石蜡的来源，整个污染物羽流明显向下迁移，而C13-CP迁移具有明显的滞后性。地下水微生物群落可能受水文地质条件(pH和深度)和短链氯化石蜡的影响。微生物群落对污染的响应是通过形成一个具有“小世界”特征的共生网络来实现的，其中Desulfobacca、Desulfomonile、Ferritrophicum、甲基单胞菌、合养杆菌和高温厌氧细菌是关键类群。此外，细菌类群和短链氯化石蜡之间的相互关系表明，微生物群落可能通过以Keystone分类群为主的厌氧有机卤化物呼吸作用或以水生细菌和噬氢菌为作用的共代谢过程来实现短链氯化石蜡的脱氯和矿化。这一研究结果将有助于更好地了解地下水系统中短链氯化石蜡的环境行为和生态效应。
The vertical migrations of toxic and persistent short-chain chlorinated paraffins (SCCPs) in soils as well as the microbial responses have been reported, however, there is a paucity of data on the resulting groundwater contamination. Here, we determined the concentration and congener profile of SCCPs in the groundwater beneath a production plant of chlorinated paraffins (CPs) and characterized the microbial community to explore their responses to SCCPs. Results showed that SCCPs ranged from not detected to 70.3 μg/L, with C13-CPs (11.2–65.8%) and Cl7-CPs (27.2–50.6%), in mass ratio, as the dominant groups. Similar to the distribution pattern in soils, SCCPs in groundwater were distributed in hotspot pattern. CP synthesis was the source of SCCPs in groundwater and the entire contamination plume significantly migrated downgradient, while there was an apparent hysteresis of C13-CP migration. Groundwater microbial community was likely shaped by both hydrogeological condition (pH and depth) and SCCPs. Specifically, the microbial community responded to the contamination by forming a co-occurrence network with “small world” feature, whereDesulfobacca, Desulfomonile, Ferritrophicum, Methylomonas, Syntrophobacter, Syntrophorhabdus, Syntrophus, andThermoanaerobaculumwere the keystone taxa. Furthermore, the interrelations between bacterial taxa and SCCPs indicated that the microbial community might cooperate to achieve the dechlorination and mineralization of SCCPs through either anaerobic organohalide respiration mainly functioned by the keystone taxa, or cometabolic degradation processes functioned byAquabacteriumandHydrogenophaga. Results of this study would provide a better understanding of the environmental behavior and ecological effects of SCCPs in groundwater systems.