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Inhibition of total oxygen uptake by silica nanoparticles in activated sludge
- Source :
- Journal of Hazardous Materials. 283:841-846
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- Nanoparticle toxicity to biological activities in activated sludge is largely unknown. Among the widely used nanoparticles, silica nanoparticles (SNP) have a limited number of studies associated with inhibition to the activated sludge process (ASP). We demonstrated SNP inhibition of activated sludge respiration through oxygen uptake rate (OUR) measurement. Based on the percentage inhibition of total oxygen consumption (IT), we observed that smaller SNPs (12 nm, IT = 33 ± 3%; 151 nm, IT = 23 ± 2%) were stronger inhibitors than larger SNPs (442 and 683 nm, IT = 5 ± 1%). Transmission electron micrographs showed that some of the SNPs were adsorbed on and/or apparently embedded somewhere in the microbial cell membrane. Whether SNPs are directly associated with the inhibition of total oxygen uptake warrants further studies. However, it is clear that SNPs statistically significantly altered the composition of microbial membrane lipids, which was more clearly described by principal component analysis and weighted Euclidian distance (PCA-ED) of the fatty acid methyl ester (FAME) data. This study suggests that SNPs potentially affect the biological activity in activated sludge through the inhibition of total oxygen uptake.
- Subjects :
- Environmental Engineering
Health, Toxicology and Mutagenesis
Membrane lipids
chemistry.chemical_element
Waste Disposal, Fluid
Oxygen
chemistry.chemical_compound
Bioreactors
Microscopy, Electron, Transmission
Respiration
Environmental Chemistry
Waste Management and Disposal
Fatty acid methyl ester
Principal Component Analysis
Bacteria
Sewage
Fatty Acids
Biological activity
Silicon Dioxide
Pollution
Activated sludge
Biochemistry
chemistry
Toxicity
Nanoparticles
Composition (visual arts)
Subjects
Details
- ISSN :
- 03043894
- Volume :
- 283
- Database :
- OpenAIRE
- Journal :
- Journal of Hazardous Materials
- Accession number :
- edsair.doi.dedup.....545bb1f560d534c9075a60718f8ac3bb