Experimental Insights into the Fermentation of Pyro-Syngas to Ethanol in a Semi-Batch and Continuous Stirred Bioreactor with Mathematical Modelling and Optimization

Dinabandhu Manna, Ranjana Chowdhury, Rajnish K. Calay and Mohamad Y. Mustafa ()
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Dinabandhu Manna: Chemical Engineering Department, Jadavpur University, Kolkata 700032, India
Ranjana Chowdhury: Chemical Engineering Department, Jadavpur University, Kolkata 700032, India
Rajnish K. Calay: Department of Building, Energy and Material Technology, UiT the Arctic University of Norway, Narvik Campus, 8514 Narvik, Norway
Mohamad Y. Mustafa: Department of Building, Energy and Material Technology, UiT the Arctic University of Norway, Narvik Campus, 8514 Narvik, Norway

Energies, 2024, vol. 17, issue 3, 1-26

Abstract: Syngas fermentation can play an important role in implementing the concept of biorefinery as it can serve as a platform to convert high-lignin biomass to biofuels. For the utilization of this process in commercial scale, the generation of an experimental database supported by a deterministic mathematical model and optimization is necessary. In this study, a locally isolated clostridial consortium, UACJUChE1 , was used to convert pyro-syngas to ethanol and acetic acid. Mathematical models were developed and validated for a 3 L stirred and gas-sparged bioreactor operated in both semi-batch and continuous modes. The volumetric productivity of ethanol was correlated with the dilution rate and the gas residence time. The performance of the bioreactor, run in both semi-batch and continuous modes, was optimized using response surface methodology. For the semi-batch operation, a maximum ethanol concentration of 13.122 g/L after 30 h operation was achieved at optimum values of pyrolysis temperature, ratio of gas to liquid volume (V G /V L ), and volumetric gas flow rate of 648 °C, 0.46, and 6.7 L/h respectively. For continuous operation, a maximum ethanol concentration of 29.450 g/L after 300 h is obtained at optimum values of V G /V L and ratio of gas to liquid volumetric flow rate of 0.28 and 335.148, respectively.

Keywords: pyro-syngas; semi-batch and continuous stirred bioreactor; mixed clostridial consortium; mathematical modelling; optimization (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: 2024
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