Shifts in dissolved organic matter and microbial community composition are associated with enhanced removal of fecal pollutants in urban stormwater wetlands

TitleShifts in dissolved organic matter and microbial community composition are associated with enhanced removal of fecal pollutants in urban stormwater wetlands
Publication TypeJournal Article
Year of Publication2018
AuthorsHuang X., Rippy MA, Mehring A.S, Winfrey B.K, Jiang S.C, Grant S.B
JournalWater Research
Volume137
Pagination310-323
Date Published2018/06
Type of ArticleArticle
ISBN Number0043-1354
Accession NumberWOS:000430520200032
Keywordsaustralia; bacteria; california; constructed wetlands; dissolved organic matter; diversity; Engineering; Environmental Sciences & Ecology; Fecal indicator; indicators; microbial community; pathogen; pathogens; pollution; reveals; Stormwater wetland; Water quality; Water resources; water-quality
Abstract

Constructed stormwater wetlands provide a host of ecosystem services, including potentially pathogen removal. We present results from a multi-wetland study that integrates across weather, chemical, microbiological and engineering design variables in order to identify patterns of microbial contaminant removal from inlet to outlet within wetlands and key drivers of those patterns. One or more microbial contaminants were detected at the inlet of each stormwater wetland (Escherichia coli and Enterococcus > Bacteroides HF183 > adenovirus). Bacteroides HF183 and adenovirus concentrations declined from inlet to outlet at all wetlands. However, co-removal of pathogens and fecal indicator bacteria only occurred at wetlands where microbial assemblages at the inlet (dominated by Proteobacteria and Bacteriodetes) were largely displaced by indigenous autotrophic microbial communities at the outlet (dominated by Cyanobacteria). Microbial community transitions (characterized using pyrosequencing) were well approximated by a combination of two rapid indicators: (1) fluorescent dissolved organic matter, and (2) chlorophyll a or phaeophytin a fluorescence. Within-wetland treatment of fecal markers and indicators was not strongly correlated with the catchment-to-wetland area ratio, but was diminished in older wetlands, which may point to a need for more frequent maintenance. (C) 2018 Elsevier Ltd. All rights reserved.

DOI10.1016/j.watres.2018.03.020
Short TitleWater Res.
Student Publication: 
No