Department of Chemical Engineering, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom.
Bioresour Technol. 2019 Oct;290:121733. doi: 10.1016/j.biortech.2019.121733. Epub 2019 Jul 2.
This study was carried out to investigate the relationship between the methane producing pathways and the characteristics of anaerobic granules treating municipal wastewater. For this purpose, two pilot scale upflow anaerobic sludge blanket reactors with different granule size distribution (1-2 mm and 3-4 mm) were investigated at operating temperatures of 20 °C and 28 °C for 239 days. There was an increased and stable biogas production when temperature was elevated to 28 °C likely due to reduction in methane solubility. Larger granules had multi-layered internal microstructures with higher acetoclastic methanogenic activities (250-437 mL CH g VS d) than smaller granules (150-260 mL CH g VS d). The relative abundance of acetoclastic methanogens of larger granules was higher, confirming acetoclastic methane producing pathway was more prominent. However, there was no significant difference in the performance of the two reactors because they were operating below their capacities in terms of organic loading rate to volatile solids ratio.
本研究旨在探讨产甲烷途径与厌氧颗粒处理城市污水特性之间的关系。为此，在 20°C 和 28°C 的运行温度下，对两种不同颗粒粒径分布（1-2mm 和 3-4mm）的中试规模上流式厌氧污泥床反应器进行了 239 天的研究。当温度升高到 28°C 时，沼气产量增加且稳定，这可能是由于甲烷溶解度降低所致。较大的颗粒具有多层内部微观结构，比较小的颗粒（150-260mLCHgVSd）具有更高的产乙酸甲烷活性（250-437mLCHgVSd）。较大颗粒中产乙酸甲烷菌的相对丰度更高，证实了产乙酸甲烷途径更为突出。然而，由于有机负荷与挥发性固体比低于其容量，两个反应器的性能没有显著差异。
