Influence of thermal pretreatment on characteristic and anaerobic digestion of Sunflower meal

IF 5 Q1 Environmental Science

Bioresource Technology Reports Pub Date : 2026-06-01 Epub Date: 2026-05-20 DOI:10.1016/j.biteb.2026.102830

Asad Ayub Rajput, Zeshan, Muhammad Raheel Bawani, Saleem Raza Chalgri

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Abstract

Lignocellulosic nature of sunflower meal (SFM) is the main hindrance in its anaerobic digestion (AD). Therefore, the focus of the present study is to assess the influence of thermal pretreatment (TPT) on chemical and structural changes as well as biogas production of SFM. Therefore, TPT of SFM was performed at temperatures 120, 140, 160 and 180 °C and compared with untreated SFM. Reactor fed with SFM-180 °C showed the highest biogas yield of 873 NmL/gVS which is 29% higher as compared to untreated SFM. Images from scanning electron microscope (SEM) revealed the appearances of new surfaces in pretreated SFM at 180 °C as compared to raw SFM. Fourier transformation infrared spectroscopy (FTIR) results showed changes in chemical bonds due to the TPT of SFM at 180 °C. The modified Gompertz model (MGM) was best fitted on the TPT data of SFM and showed a shorter lag phase time as the TPT temperature increased. Changes in the lignocellulosic structure were the main reasons for optimizing the anaerobic process.

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热预处理对向日葵粕特性及厌氧消化的影响

向日葵粕的木质纤维素性质是其厌氧消化（AD）的主要障碍。因此，本研究的重点是评估热预处理（TPT）对SFM化学和结构变化以及沼气产量的影响。因此，在120、140、160和180°C的温度下对SFM进行TPT，并与未处理的SFM进行比较。SFM-180°C的反应器沼气产量最高，为873 NmL/gVS，比未处理的SFM高29%。扫描电子显微镜（SEM）的图像显示，与原始SFM相比，在180°C下预处理的SFM中出现了新的表面。傅里叶变换红外光谱（FTIR）结果表明，SFM在180°C时发生了化学键的变化。改进的Gompertz模型（MGM）与SFM的TPT数据拟合最好，并且随着TPT温度的升高，滞后相位时间更短。木质纤维素结构的改变是优化厌氧工艺的主要原因。

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