Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Two-stage anaerobic and post-aerobic mesophilic digestion of sewage sludge: Analysis of process performance and hygienization potential |
| Abstract | Sequential anaerobic-aerobic digestion has been demonstrated to be effective for enhanced sludge stabilization, in terms of increased solid reduction and improvement of sludge dewaterability. In this study, we propose a modified version of the sequential anaerobic-aerobic digestion process by operating the aerobic step under mesophilic conditions (T = 37 °C), in order to improve the aerobic degradation kinetics of soluble and particulate chemical oxygen demand (COD). Process performance has been assessed in terms of "classical parameters" such as volatile solids (VS) removal, biogas production, COD removal, nitrogen species, and polysaccharide and protein fate. The aerobic step was operated under intermittent aeration to achieve nitrogen removal. Aerobic mesophilic conditions consistently increased VS removal, providing 32% additional removal vs. 20% at 20. °C. Similar results were obtained for nitrogen removal, increasing from 64% up to 99% at the higher temperature. Improved sludge dewaterability was also observed with a capillary suction time decrease of ~. 50% during the mesophilic aerobic step. This finding may be attributable to the decreased protein content in the aerobic digested sludge. The post-aerobic digestion exerted a positive effect on the reduction of microbial indicators while no consistent improvement of hygienization related to the increased temperature was observed. The techno-economic analysis of the proposed digestion layout showed a net cost saving for sludge disposal estimated in the range of 28-35% in comparison to the single-phase anaerobic digestion. |
| Source | Science of the total environment 545-546, pp. 453–464 |
| Keywords | Nitrogen fatePost-aerobic mesophilic digestionSequential anaerobic-aerobic digestionSludge hygienizationSludge stabilization |
| Journal | Science of the total environment |
| Editor | Elsevier, Lausanne ;, Paesi Bassi |
| Year | 2016 |
| Type | Articolo in rivista |
| DOI | 10.1016/j.scitotenv.2015.12.053 |
| Authors | Tomei M.C.; Mosca Angelucci D.; Levantesi C. |
| Text | 354816 2016 10.1016/j.scitotenv.2015.12.053 Scopus 2 s2.0 84952838126 ISI Web of Science WOS WOS 000369493000047 Nitrogen fate Post aerobic mesophilic digestion Sequential anaerobic aerobic digestion Sludge hygienization Sludge stabilization Two stage anaerobic and post aerobic mesophilic digestion of sewage sludge Analysis of process performance and hygienization potential Tomei M.C.; Mosca Angelucci D.; Levantesi C. Water Research Institute, C.N.R., Via Salaria, km 29.300, C.P. 10, Monterotondo Stazione, Rome, 00015, Italy Sequential anaerobic aerobic digestion has been demonstrated to be effective for enhanced sludge stabilization, in terms of increased solid reduction and improvement of sludge dewaterability. In this study, we propose a modified version of the sequential anaerobic aerobic digestion process by operating the aerobic step under mesophilic conditions T = 37 °C , in order to improve the aerobic degradation kinetics of soluble and particulate chemical oxygen demand COD . Process performance has been assessed in terms of classical parameters such as volatile solids VS removal, biogas production, COD removal, nitrogen species, and polysaccharide and protein fate. The aerobic step was operated under intermittent aeration to achieve nitrogen removal. Aerobic mesophilic conditions consistently increased VS removal, providing 32% additional removal vs. 20% at 20. °C. Similar results were obtained for nitrogen removal, increasing from 64% up to 99% at the higher temperature. Improved sludge dewaterability was also observed with a capillary suction time decrease of . 50% during the mesophilic aerobic step. This finding may be attributable to the decreased protein content in the aerobic digested sludge. The post aerobic digestion exerted a positive effect on the reduction of microbial indicators while no consistent improvement of hygienization related to the increased temperature was observed. The techno economic analysis of the proposed digestion layout showed a net cost saving for sludge disposal estimated in the range of 28 35% in comparison to the single phase anaerobic digestion. 545 546 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 84952838126 partnerID=q2rCbXpz Two stage anaerobic and post aerobic mesophilic digestion of sewage sludge Analysis of process performance and hygienization potential Tomei et al STOTEN_2016.pdf Articolo in rivista Elsevier 0048 9697 Science of the total environment Science of the total environment Sci. total environ. domenica.moscaangelucci MOSCA ANGELUCCI DOMENICA caterina.levantesi LEVANTESI CATERINA mariaconcetta.tomei TOMEI MARIA CONCETTA |