Effects of iron oxides on the anaerobic codigestion performances of the Pennisetum hybrid and kitchen waste
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Date
2022-08-12
Authors
Wo, Defang
Bi, Guican
Li, Lianhua
Kang, Xihui
Kong, Xiaoying
Jiang, Enchen
Xie, Jun
Journal Title
Journal ISSN
Volume Title
Publisher
American Society of Civil Engineers
Published Version
Abstract
The addition of iron oxides in anaerobic digestion can increase conversion efficiency. In this study, we investigated the effects of the addition of Fe2O3, Fe2O3 nanoparticles, Fe3O4, and Fe3O4 nanoparticles with different concentrations (0.5%–1.5%) on the anaerobic codigestion of a Pennisetum hybrid and kitchen waste in a batch-mode mesophilic experiment. The results indicated that the additives with different valence states and particle sizes had different effects on the anaerobic codigestion of the Pennisetum hybrid and kitchen waste. The addition of 0.5% Fe2O3 [with a biogas production of 286.0±61.8 mL/g volatile solid (VS)] and 0.5% Fe3O4 (with a biogas production of 309.1±22.3 mL/g VS) improved the cumulative biogas yield by 23.5% and 37.9%, respectively, compared with that of the control group (with a biogas production of 237.2±30.1 mL/g VS). Further correlation analysis showed that pH and total ammonia nitrogen were positively correlated with cumulative biogas yield, whereas bicarbonate alkalinity concentration/volatile alkalinity concentration and volatile fatty acids were negatively correlated with cumulative biogas yield. This study provided insights on anaerobic codigestion of the Pennisetum hybrid and kitchen waste in the presence of iron oxides, which will be beneficial for further studies in the field of renewable energy production.
Description
Keywords
Biogas , Codigestion , Iron oxides , Kitchen waste , Pennisetum hybrid
Citation
Wo, D., Bi, G., Li, L., Kang, X, Kong, X., Jiang, E. and Xie, J. (2022) 'Effects of iron oxides on the anaerobic codigestion performances of the Pennisetum hybrid and kitchen waste', Journal of Environmental Engineering, 148(10), 04022062. doi: 10.1061/(ASCE)EE.1943-7870.0002046
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Copyright
© 2022, ASCE. This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at: https://doi.org/10.1061/(ASCE)EE.1943-7870.0002046