Department of Environment and Resources, Southwest University of Science and Technology, Mianyang 621010, PR China.
Biogas Institute of Ministry of Agriculture and Rural Affairs, Chengdu 610041, PR China; Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, PR China.
Bioresour Technol. 2023 Feb;370:128545. doi: 10.1016/j.biortech.2022.128545. Epub 2022 Dec 27.
This study aimed to further investigate the effect of air mixing on the performance of a high-solids anaerobic digestion system and reveal its underlying mechanisms via analyses of carbon conversion, microbial communities and key functional genes. When the air mixing intensity was 12.5, 37.5 and 62.5 mL/(L‧min), compared with the anaerobic digestion without air mixing, the methane yield was increased by 6 %, 13 % and 6 %, respectively. The improved performance was partly attributed to the increased hydrolysis rate of macromolecular substances by 5 %-16 % and carbon recovery in the form of methane by 6 %-7% compared with the controls. Functional flora (Magnetospirillum, Synergistaceae) and hydrolytic metabolism-related enzymes (cellulose, α-amylase) demonstrated higher abundance under air mixing condition, thus promoting the degradation of organic matter and methane production. This work provides some new insights into the use of air mixing to improve anaerobic digestion of high-solids waste.
本研究旨在通过分析碳转化、微生物群落和关键功能基因，进一步探讨空气混合对高固体厌氧消化系统性能的影响及其作用机制。当空气混合强度分别为 12.5、37.5 和 62.5 mL/(L·min)时，与无空气混合的厌氧消化相比，甲烷产量分别提高了 6%、13%和 6%。与对照组相比，这种性能的提高部分归因于提高了 5%-16%的大分子物质水解速率和 6%-7%的甲烷形式的碳回收率。在空气混合条件下，功能菌群（磁螺菌属、协同菌科）和水解代谢相关酶（纤维素、α-淀粉酶）的丰度更高，从而促进了有机物的降解和甲烷的生成。这项工作为利用空气混合来改善高固体废物的厌氧消化提供了一些新的见解。
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