Methane production via anaerobic digestion of glycerol
In the last decade, a global attempt has started for reduced use of fossil fuels. Biodiesel is an alternative fuel with some significant advantages (e.g. renewable, non-toxic). The production of biodiesel is achieved via the transesterification reaction 1. In this process glycerol corresponds to 10％ of the biodiesel produced. In order to render the biodiesel more economically feasible, it is crucial to find a way of glycerol valorisation 2, 3. In this study the valorisation of glycerol for the production of methane (biogas) is studied, through anaerobic digestion 4-9. Initially, the biochemical methane potential (BMP) was evaluated using mixed cultures in mesophilic conditions. The yield was 306 mL CH4/g CODadded. Anaerobic digestion was studied in two different types of reactors (CSTR, PABR) in mesophilic conditions (35 ℃). The CSTR (continuous stirred tank reactor) was set at a hydraulic retention time (HRT) of 20 d, and the effect of organic loads of 5, 7.5, 10, g COD/L on biogas and methane production was studied. Stable operation was achieved for an organic load of 5g/L, with a methane productivity of 0.09 ± 0.01 L CH4/ L-reactor/d. The PABR 1013 (periodic anaerobic baffled reactor), a high-rate bioreactor, set at 35 ℃ and a HRT of 10 d was also tested for organic concentrations of 10, 15, 20, 25, 37.5 g COD/ L and the methane productivity was 0.28 ± 0.08, 0.48 ± 0.05, 0.63 ± 0.02, 0.75 ± 0.11 and 1.07 ± 0.18 L CH4/Lreactor/d respectively. Thus much more efficient operation (higher organic loading rate) is possible in a PABR.
Glycerol Methane CSTR PABR
T. VLASSIS K. STAMATELATOU G. ANTONOPOULOU K. MARAZIOTI G. LYBERATOS
Department of Chemical Engineering, University of Patras, Karatheodori 1st., 26500 Patras, Greece Institute of Chemical Engineering and High Temperature Chemical Processes, 26504 Patras, Greece
国际会议
北京
英文
269-274
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）