Abstract
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 °C were studied and the results were compared with raw wheat straw. Significant differences in biogas production were observed at temperature higher than 160 °C. Highest biogas yield of 615 Nml/gVS and volatile solids reduction of 69% was observed from wheat straw pretreated at 180 °C. Wheat straw pretreated at 180 °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.
| Original language | English |
|---|---|
| Pages (from-to) | 45-52 |
| Number of pages | 8 |
| Journal | Journal of Environmental Management |
| Volume | 221 |
| DOIs | |
| Publication status | Published - 1 Sept 2018 |
| Externally published | Yes |
Keywords
- Biogas production
- Kinetic model
- Lignocellulosic material
- Thermal pretreatment
- Wheat straw
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