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Improving methane production from Pennisetum hybrid by monitoring plant height and ensiling pretreatment
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Accepted Version
Date
2019-03-18
Authors
Zhang, Yi
Li, Lianhua
Kang, Xihui
Sun, Yongming
Yuan, Zhenhong
Xing, Tao
Lin, Richen
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier Ltd.
Published Version
Abstract
The biomass of grass-based Pennisetum hybrid commonly use for a biogas production via anaerobic digestion. However, it is necessary to determine a method to optimize the plant harvest time for high biogas production. Moreover, ensiling of biomass in the presence of diverse microbes may offer a solution to improve biogas production. In this study, whole plant of Pennisetum biomass (including stems and leaves) was collected at different harvesting time (plant heights of 70, 100, 150 cm), and then comparatively assessed for further ensiling and biogas production. Compared to leaves, stems exhibited a significant linear relationship (R2 = 0.99) with whole plants in terms of ensiling quality (i.e. pH and NH3-N). Microbial analysis further revealed that Lactobacillus was the dominant bacterial genus during ensiling of stems and whole plants, with the highest relative abundance of 50.08% obtained at the height of 100 cm. Ensiling of biomass at a height of 100 cm achieved the best digestion performance, with the methane yields of 316 ± 20 mL/g VS for leaves, 361 ± 43 mL/g VS for stems, and 356 ± 28 mL/g VS for whole plants. A harvesting time at the plant height of 100 cm was the optimal from the silage quality and anaerobic digestion performance.
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Keywords
Biomass , Plant height , Ensiling , Bacteria , Anaerobic digestion , Methane
Citation
Zhang, Y., Li, L., Kang, X., Sun, Y., Yuan, Z., Xing, T. and Lin, R. (2019) 'Improving methane production from Pennisetum hybrid by monitoring plant height and ensiling pretreatment', Renewable Energy, 141, pp. 57-63. doi: 10.1016/j.renene.2019.03.084