Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1016/j.enconman.2018.04.101 |
| Title (Primary) | Year-round biogas production in sugarcane biorefineries: Process stability, optimization and performance of a two-stage reactor system |
| Author | Janke, L.; Weinrich, S.; Leite, A.F.; Sträuber, H.; Radetski, C.M.; Nikolausz, M.; Nelles, M.; Stinner, W. |
| Source Titel | Energy Conversion and Management |
| Year | 2018 |
| Department | UMB |
| Volume | 168 |
| Page From | 188 |
| Page To | 199 |
| Language | englisch |
| Keywords | Sugarcane waste; Anaerobic digestion; Process design; Methane potential; Capacity factor |
| Abstract | The concept of year-round biogas production to increase the capacity factor of anaerobic digestion (AD) plants in sugarcane biorefineries was investigated for the first time in semi-continuous feeding mode. To simulate the use of sugarcane vinasse during the sugarcane season and sugarcane filter cake (SFC) during the off-season period, a two-stage reactor system based on an acidogenic continuous stirred-tank reactor (1st stage) followed by solid–liquid separation and an upflow anaerobic sludge blanket (UASB) reactor (2nd stage) to convert the COD-rich liquid fraction into biogas was operated. Additionally, to optimize the biogas production from SFC, the effects of its thermo-chemical pre-treatment on AD were investigated in a parallel reactor set-up. The saponification effect provided by autoclaving the substrate with sodium hydroxide improved the hydrolysis/fermentation of SFC in the acidogenic reactor, which in turn resulted in a 28% higher volumetric methane production in the methanogenic reactor (p < 0.05). However, the methane yields observed during operation of the two-stage reactor system were markedly lower than previously found in biochemical methane potential tests using SFC. In this case, the feed-in with low suspended solids required by UASB reactors prevented the utilization of the non-hydrolyzed/fermented solid fraction of SFC (> 60% of the substrate’s methane potential). Nevertheless, the capacity factor of the AD plants in sugarcane biorefineries could be increased from 0.55 up to 0.69 when considering a 200 d a−1 sugarcane season (0.66–0.83 for a longer season of 240 d a−1), representing an increase of 25.7%. The average capacity factor for biogas combined heat and power and upgrading units of around 0.91 (8000 h a−1) would be reached if further developments could improve the solubilization of non-hydrolyzed/fermented solids or alternatively allow their direct use in the methanogenic reactor. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=20274 |
| Janke, L., Weinrich, S., Leite, A.F., Sträuber, H., Radetski, C.M., Nikolausz, M., Nelles, M., Stinner, W. (2018): Year-round biogas production in sugarcane biorefineries: Process stability, optimization and performance of a two-stage reactor system Energy Conv. Manag. 168 , 188 - 199 10.1016/j.enconman.2018.04.101 |
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