Journal
BIOMASS & BIOENERGY
Volume 142, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2020.105775
Keywords
Anaerobic digestion; Bean straw; Biogas; Hydrolysate; Microbial community; Pre-treatment
Funding
- School of Civil Engineering at The University of Queensland
- [IPN20150837]
- [IPNBEIFI2124]
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A comparison of lignocellulose degradation, energy requirements, biogas production and microbial community analysis was done between a fungal (Pleurotus ostreatus, 28 d, 35 degrees C), thermal (1 h, 121 degrees C) and acid (2% HCl, 2 h, 123 degrees C) pre-treatment of bean straw. The results revealed that the type of pre-treatment had a great impact on lignocellulose degradation and energy demand, where the acid pre-treatment had higher solubilization capacity (lignin 67%, hemicellulose 68% and 0.49 g sugars.g(-1) bean straw) and demanded less energy as compared with the fungal pre-treatment. Contrary, the type of pre-treatment did not have an apparent effect on the anaerobic digestion of the hydrolysates after 37 days of bioreactors operation in terms of biogas yield (142-165 mL.g(-1) chemical oxygen demand-COD), COD and sugars degradation (>80%). The bioreactor using acid pre-treatment hydrolysates showed differences in the total bacterial and archaea estimates, with a more pronounced increase in archaea (Euryarchaeota) and bacteria (Bacteroidetes, Firmicutes, and Proteobacteria), suggesting a more favorable composition for microbial growth. Overall, the acid pre-treatment was the most effective on all the parameters compared in this study. Further studies should include other important parameters to consider when selecting a pre-treatment method including environmental and economic implications of solid phase disposal and pH adjustment.
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