Chanthong Sukonlarat, Kongjan Prawit, Jariyaboon Rattana, O-Thong Sompong
Energy Technology Program, Faculty of Engineering, Prince of Songkla University, Hat Yai, Songkhla, 90110, Thailand.
Chemistry Division, Department of Science, Faculty of Science and Technology, Prince of Songkla University, Pattani, 94000, Thailand.
Heliyon. 2024 Jul 25;10(15):e34817. doi: 10.1016/j.heliyon.2024.e34817. eCollection 2024 Aug 15.
This study investigates the co-digestion of hydrothermally pretreated empty fruit bunches (EFB) at 190 °C for 5 min (HTP190-EFB) with decanter cake (DC) to improve biogas production in high solid anaerobic digestion (HSAD). The HTP190-EFB exhibited a 67.98 % reduction in total solids, along with the production of 0.89 g/L of sugar, 2.39 g/L of VFA, and 0.56 g/L of furfural in the liquid fraction. Co-digestion of HTP190-EFB with DC at mixing ratios of 5, 10, and 15 %w/v demonstrated improved methane yields and process stability compared to mono-digestion of HTP190-EFB. The highest methane yield of 372.69 mL CH/g-VS was achieved in the co-digestion with 5 %w/v DC, representing a 15 % increase compared to digestion of HTP190-EFB (324.30 mL CH/g-VS) alone. Synergistic effects were quantified, with the highest synergistic methane yield of 77.65 mL CH/g-VS observed in the co-digestion with 5 %w/v DC. Microbial community analysis revealed that co-digestion of hydrothermally pretreated EFB with decanter cake promoted the growth of sp., sp., sp., sp., and sp., contributing to enhanced biogas production compared to mono-digestion of pretreated EFB. Energy balance analysis revealed that co-digestion of HTP190-EFB with DC resulted in a total net energy of 599.95 kW, 52 % higher than mono-digestion of HTP190-EFB (394.62 kW). Economic analysis showed a shorter return on investment for the co-digestion system (0.86 years) compared to the mono-digestion of HTP190-EFB (1.02 years) and raw EFB (2.69 years). The co-digestion of HTP190-EFB with 5 %w/v DC offers a promising approach to optimize methane yield, process stability, and economic feasibility, supporting the palm oil industry for producing renewable energy and sustainable waste management.
本研究考察了在190℃下对空果串（EFB）进行5分钟水热预处理（HTP190-EFB）后与滗析器污泥（DC）共消化，以提高高固体厌氧消化（HSAD）中的沼气产量。HTP190-EFB的总固体含量降低了67.98%，同时在液相中产生了0.89 g/L的糖、2.39 g/L的挥发性脂肪酸和0.56 g/L的糠醛。与HTP190-EFB单消化相比，HTP190-EFB与DC以5%、10%和15%（w/v）的混合比共消化表现出更高的甲烷产量和过程稳定性。在与5%（w/v）DC共消化时，甲烷产量最高达到372.69 mL CH/g-VS，比单独消化HTP190-EFB（324.30 mL CH/g-VS）提高了15%。对协同效应进行了量化，在与5%（w/v）DC共消化时观察到最高协同甲烷产量为77.65 mL CH/g-VS。微生物群落分析表明，水热预处理的EFB与滗析器污泥共消化促进了 菌属、 菌属、 菌属、 菌属和 菌属的生长，与预处理EFB单消化相比，有助于提高沼气产量。能量平衡分析表明，HTP190-EFB与DC共消化产生的总净能量为599.95 kW，比HTP190-EFB单消化（394.62 kW）高52%。经济分析表明，与HTP190-EFB单消化（1.02年）和未处理EFB单消化（2.69年）相比，共消化系统的投资回收期更短（0.86年）。HTP190-EFB与5%（w/v）DC共消化为优化甲烷产量、过程稳定性和经济可行性提供了一种有前景的方法，有助于棕榈油行业生产可再生能源和实现可持续废物管理。
