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• W2237698093 abstract "Reaction mechanisms between ozone and extracellular polymeric substances (EPS) can be the key of understanding the improvements in microbial aggregates properties by low-concentration ozonation. In this study, EPS are extracted from activated sludge and treated continuously by ozone gas at 270 ± 41 ppm. The reaction between ozone and EPS was investigated by observation of EPS component concentrations, functional groups and molecular weight distributions using UV-Vis spectrometry, excitation-emission matrix fluorescence spectroscopy (EEM), high performance size-exclusion chromatography (HPSEC) and gas chromatography-mass spectrometry (GC-MS). In a 12-hour-ozonation experiment, significant ozone consumption was observed in the first 4 h and protein concentration in EPS solution was reduced by 30 ± 12%. However, the polysaccharides concentration only had a slightly decrease at the end of the ozonation process. UV-Vis spectra and EEM spectra results suggest that ozone removed protein and fluorescent matters (SMP and tryptophan-like aromatic protein) rapidly by attacking specific amino acid residues on polypeptide chain. After ozonation, the molecular weight of polysaccharide and protein dropped by 4 orders of magnitude according to HPSEC results. TOC concentration of EPS solution was reduced by 13 ± 2% after ozonation. The loss in TOC could be explained by the observation of volatile organic compounds such as carboxylic acids, aldehydes and ketones in the off-gas detected by GC-MS. The results in this study can provide a better understanding towards the mechanisms of improvements in activated sludge properties by ozonation." @default.
• W2237698093 created "2016-06-24" @default.
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• W2237698093 date "2016-03-01" @default.
• W2237698093 modified "2023-09-24" @default.
• W2237698093 title "Degradation of extracellular polymeric substances (EPS) extracted from activated sludge by low-concentration ozonation" @default.
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• W2237698093 doi "https://doi.org/10.1016/j.chemosphere.2015.12.060" @default.
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• W2237698093 hasPublicationYear "2016" @default.
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