Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China.
Key Laboratory of Low-Grade Energy Utilization Technologies and Systems, Ministry of Education, Chongqing University, Chongqing 400030, China; Institute of Engineering Thermophysics, School of Energy and Power Engineering, Chongqing University, Chongqing 400030, China.
Bioresour Technol. 2022 Oct;362:127822. doi: 10.1016/j.biortech.2022.127822. Epub 2022 Aug 24.
In this work, metal-organic frameworks (MOFs) were prepared to evaluate its impact on carbon dioxide (CO) biomethanization during anaerobic degradation (AD). The results showed that MOFs significantly improved the CO biomethanation efficiency, especially in the AD reactors using a concentration of 1.0 g/L MOFs. Furthermore, MOFs promoted direct interspecific electron transfer and alleviated the hydrogen competition of bacteria. Meanwhile, hydrogenotrophic methanogens were enriched in the AD reactors with MOFs. After the addition of MOFs, there was 3.28 times and 3.41 times increase in the abundance of metabolic functions related to methanogenesis by CO reduction with hydrogen and dark hydrogen oxidation, respectively. There was an increased abundance of all genes that encode the key enzymes used in methane metabolism. However, functional genes involved in nitrate reduction had their expressions inhibited. The work may offer a contribution to helping the industry achieve the carbon capture and utilization policy.
在这项工作中，制备了金属有机骨架（MOFs）以评估其对厌氧降解（AD）过程中二氧化碳（CO）生物甲烷化的影响。结果表明，MOFs 显著提高了 CO 的生物甲烷化效率，特别是在使用 1.0 g/L MOFs 的 AD 反应器中。此外，MOFs 促进了种间直接电子转移，并减轻了细菌的氢气竞争。同时，在添加 MOFs 的 AD 反应器中，氢营养型产甲烷菌得到了富集。添加 MOFs 后，与 CO 通过氢气还原和暗氢氧化生成甲烷相关的代谢功能的丰度分别增加了 3.28 倍和 3.41 倍。所有编码甲烷代谢关键酶的基因的丰度都增加了。然而，参与硝酸盐还原的功能基因的表达受到抑制。这项工作可能有助于工业实现碳捕获和利用政策。
