Impact of a wastewater treatment plant on microbial community composition and function in a hyporheic zone of a eutrophic river

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Atashgahi , S , Aydin , R , Dimitrov , M R , Sipkema , D , Hamonts , K , Lahti , L , Maphosa , F , Kruse , T , Saccenti , E , Springael , D , Dejonghe , W & Smidt , H 2015 , ' Impact of a wastewater treatment plant on microbial community composition and function in a hyporheic zone of a eutrophic river ' , Scientific Reports , vol. 5 , 17284 . https://doi.org/10.1038/srep17284

Title: Impact of a wastewater treatment plant on microbial community composition and function in a hyporheic zone of a eutrophic river
Author: Atashgahi, Siavash; Aydin, Rozelin; Dimitrov, Mauricio R.; Sipkema, Detmer; Hamonts, Kelly; Lahti, Leo; Maphosa, Farai; Kruse, Thomas; Saccenti, Edoardo; Springael, Dirk; Dejonghe, Winnie; Smidt, Hauke
Contributor: University of Helsinki, Departments of Faculty of Veterinary Medicine
Date: 2015-11-26
Language: eng
Number of pages: 13
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/162423
Abstract: The impact of the installation of a technologically advanced wastewater treatment plant (WWTP) on the benthic microbial community of a vinyl chloride (VC) impacted eutrophic river was examined two years before, and three and four years after installation of the WWTP. Reduced dissolved organic carbon and increased dissolved oxygen concentrations in surface water and reduced total organic carbon and total nitrogen content in the sediment were recorded in the post-WWTP samples. Pyrosequencing of bacterial 16S rRNA gene fragments in sediment cores showed reduced relative abundance of heterotrophs and fermenters such as Chloroflexi and Firmicutes in more oxic and nutrient poor post-WWTP sediments. Similarly, quantitative PCR analysis showed 1-3 orders of magnitude reduction in phylogenetic and functional genes of sulphate reducers, denitrifiers, ammonium oxidizers, methanogens and VC-respiring Dehalococcoides mccartyi. In contrast, members of Proteobacteria adapted to nutrient-poor conditions were enriched in post-WWTP samples. This transition in the trophic state of the hyporheic sediments reduced but did not abolish the VC respiration potential in the post-WWTP sediments as an important hyporheic sediment function. Our results highlight effective nutrient load reduction and parallel microbial ecological state restoration of a human-stressed urban river as a result of installation of a WWTP.
Subject: CHLORINATED ALIPHATIC-HYDROCARBONS
SULFATE-REDUCING BACTERIA
SEASONAL DYNAMICS
CONTAMINATED GROUNDWATER
COMMON FEATURES
ORGANIC-MATTER
VINYL-CHLORIDE
SEDIMENT
STREAM
CARBON
1172 Environmental sciences
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