摘要

       海洋排放口可以是将污水和雨水排放到海中的废水管理系统；因此，它是休闲海滩微生物污染的来源，包括抗生素抗性基因 (ARG)，导致无法治愈的疾病增加。在这方面，必须有效地定位海洋排放口以减轻这些风险。本研究旨在 1) 调查休闲海滩上大肠杆菌 (E.coli) 和 ARG 的时空变异性，以及 2) 设计海洋排放口以降低微生物风险。为此，本研究在韩国广安里海滩对具有影响环境变量的大肠杆菌和 ARG 进行了集中监测。使用环境流体动力学代码 (EFDC) 并使用监测数据进行校准，并探索了 12 个排污口延伸场景（2 个深度的 6 个位置）。结果表明，重新定位海洋排放口可以显着降低海滩上大肠杆菌和 ARGs 的浓度 46-99%。海底延伸的离岸排污口比海面的陆上排污口更有效地降低了海滩上大肠杆菌和 ARG 的浓度。这些发现可能有助于未来在休闲海滩制定微生物污染管理计划。

       A marine outfall can be a wastewater management system that discharges sewage and stormwater into the sea; hence, it is a source of microbial pollution on recreational beaches, including antibiotic resistant genes (ARGs), which lead to an increase in untreatable diseases. In this regard, a marine outfall must be efficiently located to mitigate these risks. This study aimed to 1) investigate the spatiotemporal variability of Escherichia coli (E. coli) and ARGs on a recreational beach and 2) design marine outfalls to reduce microbial risks. For this purpose, E. coli and ARGs with influential environmental variables were intensively monitored on Gwangalli beach, South Korea in this study. Environmental fluid dynamic code (EFDC) was used and calibrated using the monitoring data, and 12 outfall extension scenarios were explored (6 locations at 2 depths). The results revealed that repositioning the marine outfall can significantly reduce the concentrations of E. coli and ARGs on the beach by 46–99%. Offshore extended outfalls at the bottom of the sea reduced concentrations of E. coli and ARGs on the beach more effectively than onshore outfalls at the sea surface. These findings could be helpful in establishing microbial pollution management plans at recreational beaches in the future.

https://www.sciencedirect.com/science/article/abs/pii/S0304389420325772