Gas circulation rate and medium exchange ratio as influential factors affecting ethanol production in carbon monoxide fermentation using a packed-bed reactor,Sustainable Energy & Fuels

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Gas circulation rate and medium exchange ratio as influential factors affecting ethanol production in carbon monoxide fermentation using a packed-bed reactor
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-01-28 , DOI: 10.1039/c9se00943d
Nulee Jang _{1,

2,

3,

4} , Muhammad Yasin _{1,

2,

3,

4,

5} , Mungyu Lee _{1,

2,

3,

4} , Hyunsoo Kang _{1,

2,

3,

4} , In Seop Chang _{1,

2,

3,

4}

Affiliation

A packed-bed reactor (PBR) which has recyclable internal gas and medium exchange functions for carbon monoxide (CO) fermentation was operated using an ethanol producing acetogen, Clostridium autoethanogenum DSM 10061. The PBR was designed to circulate the headspace gas, so as to achieve a higher volumetric gas–liquid mass transfer coefficient (k_La). Periodic medium exchange was performed to avoid nutrient limitations. The CO utilization rate and ethanol productivity were maximized when the medium exchange ratio was held constant, and varied linearly with the gas circulation rate. The PBR operation using 2× medium composition resulted in maximum 16.1 g L⁻¹ ethanol titer and 0.13 g L⁻¹ h⁻¹ productivity. Consistent ethanol production was achieved throughout the reactor runs, confirming the stability of the PBR operation. The cost effectiveness of the PBR operation was determined based on the medium prices and the ethanol titer. The most realistic operation parameters were 0.01 h⁻¹ (mean dilution rate) and 1.5 vvm (gas circulation rate) using 12.6 times the nutrient reinforced medium.

中文翻译：

气体循环速率和介质交换率是影响填充床反应器一氧化碳发酵乙醇生产的影响因素

使用可产生乙醇的产乙酸原，自产乙醇梭菌DSM 10061 ，对具有一氧化碳（CO）发酵功能的具有可循环内部气体和培养基交换功能的填充床反应器（PBR）进行设计。PBR设计为循环顶空气体，以便达到更高的体积气液传质系数（k _L a）。定期进行培养基交换以避免营养限制。当介质交换率保持恒定时，CO利用率和乙醇生产率最大化，并且随气体循环率线性变化。使用2x培养基组成的PBR操作导致最大16.1 g L ^-1乙醇滴定度和0.13 g L ^-1 h ^-1生产率。在整个反应器运行中均实现了一致的乙醇生产，证实了PBR操作的稳定性。基于中间价格和乙醇滴定度来确定PBR操作的成本效益。最实际的操作参数是0.01 h ^-1（平均稀释率）和1.5 vvm（气体循环率），使用的是营养强化培养基的12.6倍。

更新日期：2020-01-28

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