Can Wastewater Treatment Plants (WWTPs) cope with future nanoparticles (ENPs) loading scenarios? Valerio Cappadonaa, Rebecca Skuceb, Charles Knappa, Vernon.

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Presentation transcript:

Can Wastewater Treatment Plants (WWTPs) cope with future nanoparticles (ENPs) loading scenarios? Valerio Cappadonaa, Rebecca Skuceb, Charles Knappa, Vernon Phoenixa aDepartment of Civil and Environmental Engineering, University of Strathclyde b Scottish Water valerio.cappadona@strath.ac.uk www.crew.ac.uk/hydro-nationscholars Introduction NP production, and thus release in sewage stream is exponentially increasing due to their use in cosmetics, clothing, biomedical applications and industrial catalysts1 Problematically, some nanoparticles (AgNP, TiNP, AuNP) are toxic2 Significant concern as to how they will impact wastewater treatment processes1 NPs may be harmful to essential bacteria in activated sludge (AS) 3 Wastewater treatment process may not be able to effectively remove NPs allowing them into the environment Methods NP-Flocs Sorption-Desorption-Transport Lab scale simulated activated sludge ICP-AES partitioning analysis to determine uptake of NPs by activated sludge Microscopy (TEM-SEM) and fluorescence microscopy to visualize NPs within flocs NPs impact on sludge performance Impact of NPs on COD and N-removal Comparison with Shieldhall plant Sub-acute toxicity biomarkers Changes in microbial community Next-gen genomic analysis Bioinformatics Results ENP interactions and movement in real WWTPs flocs Evaluation of WWTPs pollutants removal performances under ENP exposure Assessment WWTPs capacity to remove ENPs from sewage stream Monitoring actual and future ENP concentration in WWTPs and in natural water bodies Development a predictive tool encompassing ENP-WWT biofilm interactions Image Future Establishment of standard method to asses ENP effects on WWTPs Improvement of structural innovation to allow WWTPs to cope with future ENP concentrations Modelling ENPs release rate, movement and environmental effects Legislative process Fig a, Activated sludge treatment source Wastewater Study World press. Fig b, Colorized transmission electron micrograph of nanoparticles, source News Medical Life Science. Fig c, Microorganisms in activated sludge, source Wastewater Processing. Fig d, Daily products containing nanoparticles, source ©2006 David Hawxhurst, Woodrow Wilson International Center for Scholars. References 1) Massarsky et al., 2014, predicting the environmental impact of nanosilver. Environmental toxicology and pharmacology, 38: 861-873 2) Moore, 2006. Do nanoparticles present ecotoxicological risks for the health of the aquatic environment? Environment International, 32: 967-976. 3) Ikuma et al., 2015. When nanoparticles meet biofilms—interactions guiding the environmental fate and accumulation of nanoparticles. Front. Microbiol. 6:591. doi: 10.3389/fmicb.2015.00591. Acknowledgement: Special thanks go to Scottish Government to fund this project within the Hydro Nation Scholars Programme, Rebecca Skuce and of course my supervisors Vernon Phoenix and Charles Knapp.