Journal
JOURNAL OF ENVIRONMENTAL MANAGEMENT
Volume 221, Issue -, Pages 45-52Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.05.011
Keywords
Thermal pretreatment; Wheat straw; Lignocellulosic material; Biogas production; Kinetic model
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Hard lignocellulosic structure of wheat straw is the main hindrance in its anaerobic digestion. Thus, a laboratory scale batch experiment was conducted to study the effect of thermal pretreatment on anaerobic digestion of wheat straw. For this purpose, different thermal pretreatment temperatures of 120, 140, 160 and 180 degrees C were studied and the results were compared with raw wheat straw. Significant differences in biogas production were observed at temperature higher than 160 degrees C. Highest biogas yield of 615 Nml/gVS and volatile solids reduction of 69% was observed from wheat straw pretreated at 180 degrees C. Wheat straw pretreated at 180 degrees C showed 53% higher biogas yield as compared to untreated. Further, FTIR analysis revealed change in chemical bonds of lignocellulosic structure of wheat straw. Modified Gompertz model was best fitted on biogas production data and predicted shorter lag phase time and higher biogas production as the pretreatment temperature increased. Overall, change in lignocellulosic structure and increase in cellulose content were the main reason in enhancing biogas production.
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