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Enhancing the gas-liquid mass transfer during microbial electrosynthesis by the variation of CO2 flow rate
Process Biochemistry ( IF 4.4 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.procbio.2020.11.005
Mélida del Pilar Anzola Rojas , Marcelo Zaiat , Ernesto Rafael González , Heleen De Wever , Deepak Pant

Abstract Carbon dioxide (one of the main greenhouse gases) can be used as a raw material in microbial electrosynthesis system (MES) for the production of valuable organic compounds. However, one of the major drawbacks associated with the MES is the mass transfer limitation of CO2 in the aqueous phase. In order to overcome this limitation, several operational strategies such as the increase of CO2 flow rate have been proposed. Therefore, the present paper assessed an H-type MES (H-Cell) carried out under CO2 pure gas supplied at 5, 10 and 20 mL min−1, and a gas diffusion electrode (GDE) MES (VITO-Cell) under 5 and 20 mL min−1. In both the MESs, the increase of the CO2 flow rate led to the improvement of inorganic carbon concentration, reaching until 1068 ± 115 mg L−1 in VITO-Cell. Consequently, in H-Cell the maximum acetate production rate increased from 45 to 270 mg L−1 d−1 when the CO2 flow varied from 5 to 20 mL min−1. In VITO-Cell the maximum acetate production rate reached 85 mg L−1 d−1 at 5 mL min−1 CO2 flow rate due to a better gas-liquid mass transfer coefficient of CO2 provided by the GDE.

中文翻译:

通过改变 CO2 流速来增强微生物电合成过程中的气液传质

摘要 二氧化碳(主要的温室气体之一)可作为微生物电合成系统(MES)的原料,用于生产有价值的有机化合物。然而,与 MES 相关的主要缺点之一是水相中 CO2 的传质限制。为了克服这种限制,已经提出了几种操作策略,例如增加 CO2 流量。因此,本文评估了在 5、10 和 20 mL min-1 供应的 CO2 纯气体下进行的 H 型 MES(H-Cell),以及在 5 mL min-1 下进行的气体扩散电极(GDE)MES(VITO-Cell)和 20 mL min-1。在两个 MES 中,CO2 流速的增加导致无机碳浓度的提高,直到 VITO-Cell 中达到 1068 ± 115 mg L-1。最后,在 H-Cell 中,当 CO2 流量从 5 到 20 mL min-1 变化时,最大醋酸盐生产速率从 45 mg L-1 d-1 增加到 270 mg L-1 d-1。在 VITO-Cell 中,由于 GDE 提供的更好的 CO2 气液传质系数,在 5 mL min-1 CO2 流速下,最大乙酸盐生产速率达到 85 mg L-1 d-1。
更新日期:2021-02-01
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