暴雨会改变城市地表水的阻力值,绿色暴雨基础设施可以减轻这种影响

IF 3.5 Q3 ENGINEERING, ENVIRONMENTAL
Kassidy O'Malley, Walter McDonald and Patrick McNamara
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引用次数: 0

摘要

抗生素耐药性对全球健康构成了日益严重的威胁,而环境蓄水池则是引起关注的关键领域,同时也是潜在的缓解机会。暴雨系统是城市水循环中的一种重要环境蓄水池,但有关其对抗生素耐药性影响的研究却十分匮乏。特别是,对不同土地用途的雨水所携带的各种抗生素耐药性基因(ARGs)对地表水的影响的研究十分有限,也没有研究绿色雨水基础设施(GSI)在减轻这种影响方面所起的作用。因此,本研究试图阐明不同土地用途中 ARGs 的变异性,并评估绿色雨水基础设施在减轻 ARGs 传播方面的功效。研究人员采集了五种不同的雨水样本,分别代表混合雨水、住宅雨水、城市雨水和经过 GSI 处理的雨水,以评估不同土地利用类型的 ARG 抵抗体的变化。结果发现,从不同土地用途收集的雨水中的 ARGs 成分相似,代表了相似的多样性水平。为了了解 GSI 对 ARGs 的影响,还对一个由岩石沼泽和生物滞留池串联而成的 GSI 系统进行了采样,该 GSI 系统确实大大改变了 ARGs 的多样性。此外,研究还发现生物滞留池可将 ARG 的浓度降低 30%。这项研究还试图通过实验室规模的微观世界实验来评估所有五种雨水样本对地表水抗性组的影响。城市雨水和住宅雨水明显改变了地表水的阻力组(p < 0.05),而混合土地利用样本则没有。这一发现强调了雨水在向下游水体引入不同的 ARG 耐药性组方面所起的关键作用,从而增加了耐抗生素细菌的发展机会。不过,与流入(未经处理)的雨水相比,GSI 系统排出的雨水对微观世界实验中地表水抗药性组的影响较小。在通过 GSI 系统管理雨水径流的过程中,本研究的发现凸显了 GSI 设计和实践在限制多种多样的大量 ARGs 扩散、保护公众健康以及通过最大限度地减少对下游地表水的影响促进可持续雨水管理方面的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Stormwater alters the resistome of urban surface water, an impact that can be mitigated by green stormwater infrastructure†

Stormwater alters the resistome of urban surface water, an impact that can be mitigated by green stormwater infrastructure†

Stormwater alters the resistome of urban surface water, an impact that can be mitigated by green stormwater infrastructure†

Antibiotic resistance poses an escalating threat to global health, with environmental reservoirs being pivotal areas of concern, as well as opportunities for potential mitigation. Stormwater systems are an important type of environmental reservoir in the urban water cycle with a dearth of research related to impacts on antibiotic resistance. In particular, there has been limited research exploring the impact of diverse antibiotic resistance genes (ARGs) carried by stormwater from various land uses on surface water, nor has there been an examination of the role played by green stormwater infrastructure (GSI) in mitigating this impact. Therefore, this study sought to elucidate the variability of ARGs across diverse land uses and evaluate the efficacy of GSI in mitigating ARG dissemination. Five distinct stormwater samples—representing mixed, residential, urban, and GSI-treated effluents—were taken to assess variations in ARG resistomes based on land use types. The ARGs in stormwater collected from different land uses were found to be similar in composition and represent a similar level of diversity. A GSI system with a rock swale and bioretention cell connected in series, was also sampled to see how GSI impacted ARGs, and this GSI system did substantially alter the diversity of ARGs. Moreover, the bioretention cell was found to reduce ARG concentrations by 30%. This research also sought to assess the impact of all five stormwater samples on the resistome of surface water via lab-scale microcosm experiments. The urban and residential stormwater significantly (p < 0.05) altered the resistome of surface water, while the mixed-land use sample did not. This finding underscored stormwater's pivotal role in introducing distinct ARG resistome compositions into downstream waters, heightening the chances for development of antibiotic resistant bacteria. The effluent stormwater from the GSI system, however, had less of an impact on the resistome of surface water in the microcosm experiments in comparison to the influent (untreated) stormwater. In managing stormwater runoff through GSI systems, this study's findings highlight the potential of GSI designs and practices to limit the dissemination of diverse and abundant ARGs, safeguard public health, and contribute to sustainable stormwater management by minimizing the impact on downstream surface waters.

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