This paper presents a full-scale experience of sludge minimization by means of short contact time ozonation in a WWTP mainly fed on textile wastewater. WWTP performance over a 5-year operational data series was analyzed and compared with a one-year operation with sludge ozonation. Lab-scale respirometric tests were also performed to characterize biomass activity before and after the ozone contact reactor. Results suggest that sludge ozonation: (1) is capable to decrease excess sludge production by 17%; (2) partially decreases both N removal, by lowering the denitrification capacity, and P removal, by reducing biomass synthesis; (3) increases the decay rate from the typical value of 0.62 d-1 to 1.3 d-1; (4) decreases the heterotrophic growth rate from the typical value of 0.67 to 0.58 gCOD/gCOD.
|Titolo:||Long term effects of the ozonation of the sludge re cycling stream on excess sludge reduction and biomass activity at full-scale|
|Data di pubblicazione:||2010|
|Settore Scientifico Disciplinare:||Settore ICAR/03 - Ingegneria Sanitaria-Ambientale|
|Enti collegati al convegno:||International Water Association|
|Citazione:||Long term effects of the ozonation of the sludge re cycling stream on excess sludge reduction and biomass activity at full-scale / D. Gardoni, E. Ficara, R. Fornarelli, M. Parolini, R. Canziani. ((Intervento presentato al convegno Water and Wastewater treatment plants in town and communities of the XXI century : technologies, design and operation : IWA specialist conference tenutosi a Moscow nel 2010.|
|Appare nelle tipologie:||14 - Intervento a convegno non pubblicato|