Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan.
Institute of Environmental Sciences and Engineering (IESE), School of Civil and Environmental Engineering (SCEE), National University of Sciences and Technology (NUST), Islamabad 44000, Pakistan.
J Environ Manage. 2018 Sep 1;221:45-52. doi: 10.1016/j.jenvman.2018.05.011. Epub 2018 May 26.
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.
小麦秸秆坚硬的木质纤维素结构是其厌氧消化的主要障碍。因此，进行了实验室规模的分批实验，以研究热预处理对小麦秸秆厌氧消化的影响。为此，研究了 120、140、160 和 180°C 等不同的热预处理温度，并将结果与原始小麦秸秆进行了比较。在温度高于 160°C 时，沼气产量有显著差异。在 180°C 下预处理的小麦秸秆获得了 615 Nml/gVS 的最高沼气产量和 69%的挥发性固体减少。与未处理的相比，180°C 预处理的小麦秸秆的沼气产量高出 53%。此外，傅里叶变换红外（FTIR）分析表明，小麦秸秆木质纤维素结构的化学键发生了变化。修正的 Gompertz 模型最适合沼气产量数据，并且随着预处理温度的升高，预测出较短的迟滞期和更高的沼气产量。总的来说，木质纤维素结构的变化和纤维素含量的增加是提高沼气产量的主要原因。
