School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Microorganism and Enzyme Research Center of Engineering Technology, College of Life Science and Technology, Guangxi University, Nanning 530004, Guangxi, China.
School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China.
Bioresour Technol. 2022 Aug;357:127360. doi: 10.1016/j.biortech.2022.127360. Epub 2022 May 21.
Balanced nutrition is important for maximizing anaerobic digestion (AD) performance. Herein, the strategy of balancing sugar-fiber-nitrogen nutrients was first established for improved methane production by co-digesting two agricultural and one livestock wastes with complementary compositional properties, such as banana pseudo-stem (BPS), sugarcane baggage (SCB), and chicken manure (CM) having high sugar, fiber and nitrogen contents, respectively. The maximum methane yield was 186.5 mL/g VS with a mixture of 45.7% BPS, 26.2% SCB and 28.1% CM (with 1: 11.3: 0.3 of sugar to fiber to nitrogen ratio), increasing by 16.1%, 53.3%, 122.6% than those of mono- BPS, SCB, and CM, respectively. The co-digestion process remained stable under an organic load of 4 g VS/(L·day), which was attributed to the predominant presence of Bacteroidetes, Proteobacteria, Thauera, uncultured_bacterium_p_Aegiribacteria, and hydrogenotrophic methanogens. This study provides a deeper understanding of the co-digestion with agricultural and livestock wastes from the perspective of nutrient balance.
均衡的营养对于最大化厌氧消化（AD）性能非常重要。本文首次建立了糖-纤维-氮营养物质平衡的策略，通过共消化具有互补组成特性的两种农业废物和一种畜牧业废物（香蕉假茎（BPS）、甘蔗包装材料（SCB）和鸡粪（CM））来提高甲烷产量，这三种废物分别具有高糖、高纤维和高氮含量。当 BPS、SCB 和 CM 的比例为 45.7%、26.2%和 28.1%（糖：纤维：氮比为 1:11.3:0.3）时，混合物的最大甲烷产率为 186.5 mL/gVS，比单 BPS、SCB 和 CM 分别提高了 16.1%、53.3%和 122.6%。在 4 g VS/（L·天）的有机负荷下，共消化过程保持稳定，这归因于拟杆菌门、变形菌门、陶厄氏菌属、未培养的_bacterium_p_Aegiribacteria 和产氢甲烷菌的主要存在。本研究从营养平衡的角度更深入地了解了农业和畜牧业废物的共消化。
