Abstract
The objective of this research was to evaluate possibility of utilizing Acacia leaves (A. mangium and A. auriculiformis), which is an agro-industrial waste from the pulp and paper industry. The effects of alkaline pre-treatment and co-digestion with Napier grass for the enhancement of biogas production from Acacia leaf waste (ALW) were investigated. Six continuous stirred tank reactors with a working volume of 5 L were carried out at the laboratory scale. The results showed that pre-treatment of Acacia leaf waste (pretreated ALW) by soaking in 3 % NaOH for 48 h increased the biogas and methane productivity to 0.200 and 0.117 m3/kgVSadded compared to 0.098 and 0.048 m3/kgVSadded of raw ALW digestion, respectively. Meanwhile, the co-digestion of Acacia leaves with different proportions of Napier grass at ratios of 1:1–1:3 in volatile solid basis also increased the production of biogas and its productivity. The maximum gas production yields of 0.424 and 0.268 m3/kgVSadded for biogas and methane were obtained at 1:3 ratio. This finding affirms the potential of ALW and its possibility to use as biogas feedstock in both single and co-substrate with Napier grass.
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This research has been supported by the 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endowment Fund) and National Research University Project, Office of Higher Education Commission (WCU-58-020-CC).
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Chaiyapong, P., Chavalparit, O. Enhancement of biogas production potential from Acacia leaf waste using alkaline pre-treatment and co-digestion. J Mater Cycles Waste Manag 18, 427–436 (2016). https://doi.org/10.1007/s10163-016-0469-0
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DOI: https://doi.org/10.1007/s10163-016-0469-0