Linking microbial community and biological functions to redox potential during black-odor river sediment remediation
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RESEARCH ARTICLE
Linking microbial community and biological functions to redox potential during black-odor river sediment remediation Chen Chen 1 & Xunan Yang 2 & Hailin Luo 1 & Dong Zeng 1 & Matthew Sima 3 & Shan Huang 3,4 Received: 23 February 2020 / Accepted: 18 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The black-odor phenomenon in polluted urban rivers is a serious environmental problem that has received increasing attention in the recent years. The low redox potential (less than − 100 mV) in the sediment is considered to be the key factor causing the occurrence of black-odor phenomenon. Here, we studied the structure and function of the microbial community during the remediation of urban rivers. Results showed a clear improvement in water quality after undergoing river remediation processes. The on-site treatments showed a succession in the microbial composition and their predicted functions. The primary iron- and sulfur-reducing bacteria (Thiobacillus, Sulfuricurvum, and Sulfursoma) and the related reactions rapidly decreased after the dredging treatment but reappeared after a year. The structure and abundance of nitrogen and methane participants were also affected by river remediation process. These results indicated that although the water quality temporarily improved shortly after a dredging process, a recurrence of the black-odor phenomenon may occur as a result of the rebound in the microbial communities. Keywords Black-odor sediment . Redox potential . Microbial community succession . Functional genes . Iron/sulfate reducers . Field investigation
Introduction Rapid urbanization has led to a degradation in the water quality of urban rivers through an increase in domestic sewage, industrial wastewater, and intensive agricultural run-off into Responsible Editor: Robert Duran Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-09805-x) contains supplementary material, which is available to authorized users. * Shan Huang [email protected] 1
State Environmental Protection Key Laboratory of Urban Ecological Environment Simulation and Protection, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of China, Guangzhou 510535, China
2
Guangdong Provincial Key Laboratory of Microbial Culture Collection and Application, Guangdong Institute of Microbiology, Guangzhou 510070, China
3
Department of Civil and Environmental Engineering, Princeton University, Princeton, NJ 08544, USA
4
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou 510275, China
the aquatic ecosystems. These severely polluted aquatic environments usually contain blackish and odorous sediments that occur on a perennial or seasonal basis. This pollution (also known as the black-odor phenomenon) can in turn cause serious direct or indirect health concerns for the nearby communities (Niemczynowicz 1999; Song et al. 2017). This deterioratio
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