School of Chemical & Environmental Engineering, China University of Mining & Technology-Beijing, Beijing 100083, China.
Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture and Rural Affairs, Chengdu 610041, China.
Bioresour Technol. 2024 Feb;393:130055. doi: 10.1016/j.biortech.2023.130055. Epub 2023 Nov 22.
This study investigated the use of H-driven CO biomethanation for integrated CO capture and conversion (iCCC). Anaerobic chambers containing NaCO-amended microbial growth medium provided with H were inoculated with anaerobic granular sludge. Microorganisms were enriched that could regenerate carbonate by using the bicarbonate formed from CO absorption to generate methane. Multiple absorption-regeneration cycles were performed and effective restoration of CO absorption capacity and stable carbonate recycling via CO biomethanation were observed for CO absorbents adjusted to three different pH values (9.0, 9.5, and 10.0). The pH = 10.0 group had the highest CO absorption capacity; 65.3 mmol/L in the 5th cycle. A slight alkaline inhibition of acetoclastic methanogenesis occurred near the end of regeneration, but had limited impact on the cyclic performance of the iCCC process. Microbial communities were dominated by H-utilizing and alkali-tolerant species that could participate in CO biomethanation and survive under alternating neutral and alkaline conditions.
本研究调查了 H 驱动的 CO 生物甲烷化在集成 CO 捕获和转化（iCCC）中的应用。含有 NaCO 改良的微生物生长培养基的厌氧室提供了 H，并接种了厌氧颗粒污泥。富集了能够通过利用从 CO 吸收形成的碳酸氢盐生成甲烷来再生碳酸盐的微生物。进行了多次吸收-再生循环，并观察到调整至三个不同 pH 值（9.0、9.5 和 10.0）的 CO 吸收剂的 CO 吸收能力得到有效恢复，并且碳酸盐通过 CO 生物甲烷化稳定循环。pH = 10.0 组的 CO 吸收能力最高；第 5 周期为 65.3 mmol/L。在再生接近尾声时，产乙酸甲烷生成会受到轻微的碱性抑制，但对 iCCC 过程的循环性能影响有限。微生物群落主要由能够参与 CO 生物甲烷化并在中性和碱性交替条件下存活的利用 H 和耐碱的物种组成。
