Design of Low-Cost Ethanol Production Medium from Syngas: An Optimization of Trace Metals for Clostridium ljungdahlii

Simge Sertkaya, Nuri Azbar, Haris Nalakath Abubackar and Tugba Keskin Gundogdu
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Simge Sertkaya: Research and Application Center for Environmental Problems, Ege University, Izmir 35100, Turkey
Nuri Azbar: Department of Bioengineering, Ege University, Izmir 35100, Turkey
Haris Nalakath Abubackar: Chemical Engineering Laboratory, Faculty of Sciences and Centre for Advanced Scientific Research (CICA), University of A Coruña, Rúa da Fraga 10, 15008 A Coruña, Spain
Tugba Keskin Gundogdu: Department of Environmental Protection, Izmir Democracy University, Izmir 35140, Turkey

Energies, 2021, vol. 14, issue 21, 1-15

Abstract: Syngas fermentation via the Wood-Ljungdahl (WL) pathway is a promising approach for converting gaseous pollutants (CO and CO 2 ) into high-value commodities. Because the WL involves several enzymes with trace metal components, it requires an adequate supply of micronutrients in the fermentation medium for targeted bioprocessing such as bioethanol production. Plackett-Burman statistical analysis was performed to examine the most efficient trace elements (Ni, Mg, Ca, Mn, Co, Cu, B, W, Zn, Fe, and Mo) and their concentrations for Clostridium ljungdahlii on ethanol production. Overall, 1.5 to 2.5 fold improvement in ethanol production could be achieved with designed trace element concentrations. The effects of tungsten and copper on ethanol and biomass production were determined to be the most significant, respectively. The model developed was statistically significant and has the potential to significantly decrease the cost of trace element solutions by 18–22%. This research demonstrates the critical importance of optimizing the medium for syngas fermentation in terms of product distribution and economic feasibility.

Keywords: trace elements; syngas fermentation; bioethanol; Clostridium ljungdahlii; Plackett-Burman; Wood-Ljungdahl pathway; pareto chart (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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