| Title | Mass and energy balances of sludge processing in reference and upgraded wastewater treatment plants |
| Abstract | This paper describes the preliminary assessment of a platform of innovative upgrading solutions aimed at improving sludge management and resource recovery in wastewater treatment plants. The effectiveness of the upgrading solutions and the impacts of their integration in model reference plants have been evaluated by means of mass and energy balances on the whole treatment plant. Attention has been also paid to the fate of nitrogen and phosphorus in sludge processing and to their recycle back to the water line. Most of the upgrading options resulted in reduced production of dewatered sludge, which decreased from 45 to 56 g SS/(PE x day) in reference plants to 14-49 g SS/(PE x day) in the upgraded ones, with reduction up to 79 % when wet oxidation was applied to the whole sludge production. The innovative upgrades generally entail an increased demand of electric energy from the grid, but energy recovery from biogas allowed to minimize the net energy consumption below 10 kWh/(PE x year) in the two most efficient solutions. In all other cases the net energy consumption was in the range of -11 % and +28 % of the reference scenarios. |
| Source | Environmental science and pollution research international 22 (10), pp. 7203–7215 |
| Keywords | Wastewater treatment; Sludge management; Sludge production; Sludge minimization; Mass balance; Energy balance; Biogas valorisationWastewater treatmentSludge managementSludge productionSludge minimizationMass balanceEnergy balanceBiogas valorisation |
| Journal | Environmental science and pollution research international |
| Editor | Springer, Berlin, Germania |
| Year | 2015 |
| Type | Articolo in rivista |
| DOI | 10.1007/s11356-014-4013-2 |
| Authors | Mininni, G.; Laera, G.; Bertanza, G.; Canato, M.; Sbrilli, A. |
| Text | 340413 2015 10.1007/s11356 014 4013 2 ISI Web of Science WOS 000354486800003 Scopus 2 s2.0 84939997323 Wastewater treatment; Sludge management; Sludge production; Sludge minimization; Mass balance; Energy balance; Biogas valorisation Wastewater treatment Sludge management Sludge production Sludge minimization Mass balance Energy balance Biogas valorisation Mass and energy balances of sludge processing in reference and upgraded wastewater treatment plants Mininni, G.; Laera, G.; Bertanza, G.; Canato, M.; Sbrilli, A. CNR Istituto di Ricerca sulle Acque, via Salaria km 29.3, Monterotondo, RM I 00015, Italy; CNR Istituto di Ricerca sulle Acque, viale F. De Blasio 5, Bari, I 70132, Italy; Department of Civil, Environmental, Architectural Engineering and Mathematics, University of Brescia, via Branze 43, Brescia, I 25123, Italy; This paper describes the preliminary assessment of a platform of innovative upgrading solutions aimed at improving sludge management and resource recovery in wastewater treatment plants. The effectiveness of the upgrading solutions and the impacts of their integration in model reference plants have been evaluated by means of mass and energy balances on the whole treatment plant. Attention has been also paid to the fate of nitrogen and phosphorus in sludge processing and to their recycle back to the water line. Most of the upgrading options resulted in reduced production of dewatered sludge, which decreased from 45 to 56 g SS/ PE x day in reference plants to 14 49 g SS/ PE x day in the upgraded ones, with reduction up to 79 % when wet oxidation was applied to the whole sludge production. The innovative upgrades generally entail an increased demand of electric energy from the grid, but energy recovery from biogas allowed to minimize the net energy consumption below 10 kWh/ PE x year in the two most efficient solutions. In all other cases the net energy consumption was in the range of 11 % and 28 % of the reference scenarios. 22 Published version 2015 ESPR 22, 7203 7215 Mininni et al Versione finale pubblicata dall editore 2015 ESPR 22, 7203 7215 Mininni et al.pdf Articolo in rivista Springer 0944 1344 Environmental science and pollution research international Environmental science and pollution research international Environ. sci. pollut. res. int. Environmental science and pollution research international. Environmental science and pollution research international Print Environmental science and pollution research Print ESPR Print andrea.sbrilli SBRILLI ANDREA giuseppe.laera LAERA GIUSEPPE giuseppe.mininni MININNI GIUSEPPE TA.P07.001.004 Trattamenti per il riutilizzo e per lo smaltimento dei fanghi di depurazione |
