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epilithic biofilm as a reservoir for functional virulence factors in wastewater-dominant rivers after WWTP upgrade

Journal of Environmental Sciences 2021年第3期33卷 27-35页

作者： Guannan Mao Jinsong Liang Qiaojuan Wang Chen Zhao Yaohui Bai Ruiping Liu Huijuan Liu Jiuhui Qu Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Harbin Institute of Technology School of Civil and Environmental EngineeringShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China

Virulence factors(VFs)confer upon pathogens the ability to cause various types of damage or *** treatment plants(WWTPs)are important point sources for the emission of pathogens and VFs into receiving *** WWTP upgrades are often implemented to improve the water quality of receiving ***,knowledge on the pathogens,VFs,and health risks to receiving aquatic ecosystems after upgrade remains *** this study,we investigated detailed pathogenic information,including taxa,pathogenicity,and health risk,in two wastewater-dominant rivers after WWTP *** 16S rRNA gene sequencing,we screened 14 potential pathogens in water and epilithic biofilm samples,though they were significantly more enriched in the *** 16S rRNA and metagenomic sequencing data,we identified Pseudomonas and Aeromonas as the dominant pathogenic taxa carrying functional VFs(e.g.,mobility and offensive)in the epilithic ***,strong pathogen-specific VF-host co-occurrence events were observed in the epilithic biofilm samples,indicating the importance of biofilms as reservoirs and vehicles for ***,we demonstrated that mobility VF is crucial for biofilm formation and pathogens in biofilm carrying offensive VF may be highly *** and health risk assessment suggested that the skin contact risk of *** carrying VFs was higher than the acceptable probability of 10^(-4)in both water and epilithic biofilm samples,which may threaten ecological and human health.

关键词： Wastewater treatment plant upgrade epilithic biofilm Pathogens Virulence factors Health risk

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Numerical Modeling of Mass Transfer in the Interaction between River biofilm and a Turbulent Boundary Layer

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Open Journal of Fluid Dynamics 2024年第1期14卷 1-23页

作者： Falilou Coundoul Evrad M. D. Ngom Frédéric Y. Moulin Institut Polytechnique de Saint-Louis Université Gaston Berger Saint-Louis Senegal Institut de Mécanique des Fluides de Toulouse UMR 5502-Université de Toulouse Occitanie France

In this article dedicated to the modeling of vertical mass transfers between the biofilm and the bulk flow, we have, in the first instance, presented the methodology used, followed by the presentation of various results obtained through analyses conducted on velocity fields, different fluxes, and overall transfer coefficients. Due to numerical constraints (resolution of relevant spatial scales), we have restricted the analysis to low Schmidt numbers (Sc=0.1, Sc=1, and Sc=10) and a single roughness Reynolds number (Re*=150). The analysis of instantaneous concentration fields from various simulations revealed logarithmic concentration profiles above the canopy. In this zone, the concentration is relatively homogeneous for longer times. The analysis of results also showed that the contribution of molecular diffusion to the total flux depends on the Schmidt number. This contribution is negligible for Schmidt numbers Sc≥0.1, but nearly balances the turbulent flux for Sc=0.1. In the canopy, the local Sherwood number, given by the ratio of the total flux (within or above the canopy) to the molecular diffusion flux at the wall, also depends on the Schmidt number and varies significantly between the canopy and the region above. The exchange velocity, a purely hydrodynamic parameter, is independent of the Schmidt number and is on the order of 10% of in the present case. This study also reveals that nutrient absorption by organisms near the wall depends on the Schmidt number. Such absorption is facilitated by lower Schmidt numbers.

关键词： epilithic biofilm Passive Scalar Transport Direct Numerical Simulation Navier-Stokes

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