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DatoValore
TitleComparison between ozone and ultrasound disintegration on sludge anaerobic digestion
AbstractThis paper deals with the comparison of ultrasound (mechanical) and ozone (chemical) pre-treatment on the performances of excess sludge semi-continuous digestion. Sludge solubilisation has been investigated by varying specific energy input. For each pre-treatment, long anaerobicdigestion tests were carried out by two parallel digesters: one reactor, as control unit, was fed with untreated waste activated sludge, and the other one was fed with disintegrated sludge. To evaluate and compare the efficacy of both pre-treatments, the specific energy was maintained approximately the same. The digestion tests were carried out to investigate the feasibility of anaerobicdigestion performance (total biogas production, volatile solids removal, sludge dewaterability) and to assess the heat balance. Results obtained from the digestion of sonicated sludge at 4% disintegration degree (~2500 kJ/kg TS) showed that the ultrasound pre-treatment may be effective both in increasing VS destruction (+19%) and cumulative biogas production (+26%). On the contrary, the digestion test with ozonized sludge (ozone dose of 0.05 g O3/g TS corresponding to ~2000 kJ/kg TS) did not indicate a significant improvement on the digestion performances. By doubling the ozone dose an improvement in the organics removal and cumulative biogas production was observed. Relevant differences in terms of colloidal charge and filterability were discussed.
SourceJournal of environmental management 95 (suppl), pp. S139–S143
KeywordsUltrasound; Ozone; Sewage sludge; Anaerobicdigestion; Dewaterability
JournalJournal of environmental management
EditorAcademic Press., New York, Regno Unito
Year2012
TypeArticolo in rivista
DOI10.1016/j.jenvman.2010.07.030
AuthorsBraguglia CM; Gianico A.; Mininni, G.
Text175033 2012 10.1016/j.jenvman.2010.07.030 SCImago 0.83 Q1 Ultrasound; Ozone; Sewage sludge; Anaerobicdigestion; Dewaterability Comparison between ozone and ultrasound disintegration on sludge anaerobic digestion Braguglia CM; Gianico A.; Mininni, G. Istituto di Ricerca sulle Acque IRSA This paper deals with the comparison of ultrasound mechanical and ozone chemical pre treatment on the performances of excess sludge semi continuous digestion. Sludge solubilisation has been investigated by varying specific energy input. For each pre treatment, long anaerobicdigestion tests were carried out by two parallel digesters one reactor, as control unit, was fed with untreated waste activated sludge, and the other one was fed with disintegrated sludge. To evaluate and compare the efficacy of both pre treatments, the specific energy was maintained approximately the same. The digestion tests were carried out to investigate the feasibility of anaerobicdigestion performance total biogas production, volatile solids removal, sludge dewaterability and to assess the heat balance. Results obtained from the digestion of sonicated sludge at 4% disintegration degree 2500 kJ/kg TS showed that the ultrasound pre treatment may be effective both in increasing VS destruction 19% and cumulative biogas production 26% . On the contrary, the digestion test with ozonized sludge ozone dose of 0.05 g O3/g TS corresponding to 2000 kJ/kg TS did not indicate a significant improvement on the digestion performances. By doubling the ozone dose an improvement in the organics removal and cumulative biogas production was observed. Relevant differences in terms of colloidal charge and filterability were discussed. 95 Comparison between ozone and ultrasound disintegration on sludge anaerobic digestion comparison_beween_ozone_paper_JEMA_pubblicato.pdf Articolo in rivista Academic Press. 0301 4797 Journal of environmental management Journal of environmental management J. environ. manag. camillamaria.braguglia BRAGUGLIA CAMILLA MARIA giuseppe.mininni MININNI GIUSEPPE andrea.gianico GIANICO ANDREA TA.P07.001.005 Recupero di risorse da rifiuti e biomasse