Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea.
Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul, 05029, Republic of Korea.
Chemosphere. 2020 Oct;256:127116. doi: 10.1016/j.chemosphere.2020.127116. Epub 2020 May 19.
Anaerobic digestion (AD) of lignocellulosic biomass is appealing because of the abundance and ease of obtaining the biomass locally. However, the recalcitrance of lignocellulosic biomass presents an obstacle in the hydrolysis step of AD and lowers the process efficiency. In this study, sunflower, which is a model lignocellulosic biomass, was pretreated by thermal (hydrothermal pretreatment, HTP) and non-thermal (milling) methods; the methane yield and biodegradability of the pretreated biomass were determined using a series of batch tests. The thermal pretreatment method showed a significantly higher methane yield (213.87-289.47 mL g VS) and biodegradability (43-63%) than those of the non-thermally pretreated biomass, and the optimum pretreatment effect was observed at an HTP temperature of 180 °C. However, at an HTP temperature exceeding 200 °C, the induced formation of 5-hydroxymethylfurfural and furfural significantly lowered the methane yield and biodegradability. This study revealed that the HTP temperature is closely related to the formation of lignocellulosic biomass-degrading byproducts, which potentially hinder the methanogenesis step in AD; severe HTP conditions may have the opposite effect on the AD performance of lignocellulosic biomass.
木质纤维素生物质的厌氧消化（AD）因其在当地丰富且易于获得生物质而具有吸引力。然而，木质纤维素生物质的顽固性在 AD 的水解步骤中构成了障碍，降低了该过程的效率。在这项研究中，向日葵是一种木质纤维素生物质模型，通过热（水热预处理，HTP）和非热（粉碎）方法进行预处理；使用一系列分批试验确定预处理生物质的甲烷产量和生物降解性。与非热预处理生物质相比，热预处理方法显示出更高的甲烷产量（213.87-289.47 mL g VS）和生物降解性（43-63%），在 HTP 温度为 180°C 时观察到最佳预处理效果。然而，在 HTP 温度超过 200°C 时，5-羟甲基糠醛和糠醛的诱导形成显著降低了甲烷产量和生物降解性。本研究表明，HTP 温度与木质纤维素生物质降解副产物的形成密切相关，这些副产物可能会阻碍 AD 中的产甲烷步骤；剧烈的 HTP 条件可能对木质纤维素生物质的 AD 性能产生相反的影响。
