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이지영Jiyoung Lee

The Ohio State University

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Water Res., May 23 2024, 259 S0043-1354(24)00719-X | https://doi.org/10.1016/j.watres.2024.121818 Urban stormwater green infrastructure: Evaluating the public health service role of bioretention using microbial source tracking and bacterial community analyses

Emma Lancaster ^a,b, Ryan Winston ^b,c,d, Jay Martin ^c,e, Jiyoung Lee ^a,b,f,g

^aDivision of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, OH, USA

^bEnvironmental Sciences Graduate Program, The Ohio State University, Columbus, OH, USA

^cDepartment of Food, Agricultural, and Biological Engineering, The Ohio State University, Columbus, OH, USA

^dDepartment of Civil, Environmental, and Geodetic Engineering, The Ohio State University, Columbus, OH, USA

^eSustainability Institute, The Ohio State University, Columbus, OH, USA

^fDepartment of Food Science & Technology, The Ohio State University, Columbus, OH, USA

^gInfectious Diseases Institute, The Ohio State University, Columbus, OH, USA

Corresponding author : Jiyoung Lee

Abstract

Bioretention cells (BRCs) control stormwater flow on-site during precipitation, reducing runoff and improving water quality through chemical, physical, and biological processes. While BRCs are effective in these aspects, they provide habitats for wildlife and may face microbial hazards from fecal shedding, posing a potential threat to human health and the nearby environment. However, limited knowledge exists regarding the ability to control microbial hazards (e.g., beyond using typical indicator bacteria) through stormwater biofiltration. Therefore, the purpose of this study is to characterize changes in the bacterial community of urban stormwater undergoing bioretention treatment, with the goal of assessing the public health implications of these green infrastructure solutions. Samples from BRC inflow and outflow in Columbus, Ohio, were collected post-heavy storms from October 2021 to March 2022. Conventional culture-based E. coli monitoring and microbial source tracking (MST) were conducted to identify major fecal contamination extent and its sources (i.e., human, canine, avian, and ruminant). Droplet digital polymerase chain reaction (ddPCR) was utilized to quantify the level of host-associated fecal contamination in addition to three antibiotic resistant genes (ARGs): tetracycline resistance gene (tetQ), sulfonamide resistance gene (sul1), and Klebsiella pneumoniae carbapenemase resistance gene (bla _KPC). Subsequently, 16S rRNA gene sequencing was conducted to characterize bacterial community differences between stormwater BRC inflow and outflow. Untreated urban stormwater reflects anthropogenic contamination, suggesting it as a potential source of contamination to waterbodies and urban environments. When comparing inlet and outlet BRC samples, urban stormwater treated via biofiltration did not increase microbial hazards, and changes in bacterial taxa and alpha diversity were negligible. Beta diversity results reveal a significant shift in bacterial community structure, while simultaneously enhancing the water quality (i.e., reduction of metals, total suspended solids, total nitrogen) of urban stormwater. Significant correlations were found between the bacterial community diversity of urban stormwater with fecal contamination (e.g. dog) and ARG (sul1), rainfall intensity, and water quality (hardness, total phosphorous). The study concludes that bioretention technology can sustainably maintain urban microbial water quality without posing additional public health risks, making it a viable green infrastructure solution for heavy rainfall events exacerbated by climate change.

논문정보

형식Research article
게재일2024년 05월 (BRIC 등록일 2024-06-04)
연구진국외 연구진
분야 바이오·의료융합 > 바이오·의료융합 기타

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