Insights into the effect of mixed engineered nanoparticles on activated sludge performance

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dc.contributor.authorEduok, Samuel
dc.contributor.authorHendry, Callum
dc.contributor.authorFerguson, Robert M. W.
dc.contributor.authorMartin, Ben
dc.contributor.authorVilla, Raffaella
dc.contributor.authorJefferson, Bruce
dc.contributor.authorCoulon, Frederic
dc.date.accessioned2016-03-10T11:47:29Z
dc.date.available2016-03-10T11:47:29Z
dc.date.issued2015-07-16
dc.description.abstractIn this study, the effects, fate and transport of ENPs in wastewater treatment plants (WWTP) were investigated using three parallel pilot WWTPs operated under identical conditions. The WWTPs were spiked with (i) an ENP mixture consisting of silver oxide, titanium dioxide and zinc oxide, and (ii) bulk metal salts. The third plant served as control (unspiked). ENP effects were evaluated for (i) bulk contaminant removal, (ii) activated sludge (AS) process performance, (iii) microbial community structure and dynamics and (iv) microbial inhibition. ENPs showed a strong affinity for biosolids and induced a specific oxygen uptake rate two times higher than the control. The heterotrophic biomass retained its ability to nitrify and degrade organic matter. However, non-recovery of ammonia- and nitrite-oxidizing bacteria such as Nitrosomonas, Nitrobacter or Nitrospira in the ENP spiked reactors suggests selective inhibitory effects. The results further suggest that ENPs and metal salts have antimicrobial properties which can reduce synthesis of extracellular polymeric substances and therefore floc formation. Scanning electron microscopy evidenced selective damage to some microbes, whereas lipid fingerprinting and 454 pyrosequencing indicated a temporal shift in the microbial community structure and diversity. Acidovorax, Rhodoferax, Comamonas and Methanosarcina were identified as nano-tolerant species. Competitive growth advantage of the nano-tolerant species influenced the removal processes and unlike other xenobiotic compounds, ENPs can hasten the natural selection of microbial species in AS.en_UK
dc.identifier.citationSamuel Eduok, Callum Hendry, Robert Ferguson, Ben Martin, Raffaella Villa, Bruce Jefferson and Frédéric Coulon. Insights into the effect of mixed engineered nanoparticles on activated sludge performance. FEMS Microbiology Ecology, Vol.91, Iss.7.en_UK
dc.identifier.issn0168-6496
dc.identifier.urihttp://dx.doi.org/10.1093/femsec/fiv082
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/9776
dc.language.isoenen_UK
dc.publisherOxford University Pressen_UK
dc.rightsAttribution 4.0 International (CC BY 4.0) You are free to: Share — copy and redistribute the material in any medium or format, Adapt — remix, transform, and build upon the material for any purpose, even commercially. The licensor cannot revoke these freedoms as long as you follow the license terms. Under the following terms: Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. Information: No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
dc.subjectactivated sludgeen_UK
dc.subjectengineered nanoparticlesen_UK
dc.subjectnano-tolerant microbial speciesen_UK
dc.titleInsights into the effect of mixed engineered nanoparticles on activated sludge performanceen_UK
dc.typeArticleen_UK

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