Insights into the effect of mixed engineered nanoparticles on activated sludge performance.
Bottom Line: In 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.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.
Affiliation: School of Energy, Environment and Agrifood, Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, UK.Show MeSH
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Mentions: To further understand the changes in the AS bacterial community structure and diversity as a result of exposure to the chronic low doses of ENPs and metal salts, 454 pyrosequencing was carried out. Bacterial distribution and diversity at the phylum level for each treatment at different times are summarized in Fig. 4. A total of 17 022 sequences representing 25 classifiable phyla were obtained. A total of 7468, 4130 and 5424 sequences were obtained for the control, metal salts and ENPs spiked sludges, respectively. Most predominant phylotypes were members of the Proteobacteria, Firmicutes, Bacteriodetes, unclassified Bacteria and Actinobacteria (Table S5, Supporting Information).
Affiliation: School of Energy, Environment and Agrifood, Cranfield University, College Road, Cranfield, Bedfordshire MK43 0AL, UK.