Abstract
In this study, an attempt is made to optimize the effect of various physical and cultural parameters on butanol production by microbial strain Clostridium acetobutylicum MTCC 481 by employing L18 orthogonal array design of experiments. A set of five parameters, viz., temperature, pH, inoculum size, inoculum age, and agitation have been studied. Utilizing a pre-optimized rice straw hydrolysate medium, the clostridial strain produced maximum amount of butanol at optimum conditions of temperature 37 °C, pH 4.0 ± 0.5, inoculum size 5 % (v/v), inoculum age 18 h, and agitation 150 rpm. Among these parameters, pH, temperature, and agitation were found to be the most significant factors affecting solvent production. The optimized physical and cultural parameters were further verified at shake flask and bioreactor scale (2 L and 5 L bioreactor). Experiments using 2 and 5 L bioreactor under the optimized process condition showed nearly complete utilization of soluble sugars with the production of 15.84 g L−1 of total solvents with 12.17 g L−1 of butanol in 2 L bioreactor and 16.91 g L−1 of total solvents with 12.22 g L−1 of butanol in a 5 L of bioreactor, respectively. The experimental data were further validated by fitting it to a kinetic model reported in literature to determine the kinetic parameters of the fermentation process.
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Abbreviations
- ABE:
-
Acetone butanol ethanol
- ANOVA:
-
Analysis of variance
- CMM:
-
Cooked meat medium
- DNS:
-
Dinitrosalicylic acid
- DOE:
-
Design of experiments
- μ :
-
Specific growth rate (per hour)
- MS:
-
Mean of squares
- MTCC:
-
Microbial Type Culture Collection
- NCIM:
-
National Collection of Industrial Micro-organisms
- P :
-
Product concentration (grams per cubic liter)
- P 0 :
-
Initial product concentration (grams per cubic liter)
- P max :
-
Maximum product concentration (grams per cubic liter)
- P t :
-
Kinetic constant
- PABA:
-
p-Aminobenzoic acid
- RCA:
-
Reinforced clostridial agar
- RCM:
-
Reinforced clostridial medium
- RMSD:
-
Root mean square deviation
- RMSE:
-
Root mean square error
- RS:
-
Rice straw
- RSH:
-
Rice straw hydrolysate
- SS:
-
Sum of squares
- X :
-
Biomass concentration (grams per cubic liter)
- X m :
-
Maximum biomass concentration (grams per cubic liter)
- X 0 :
-
Biomass concentration (grams per cubic liter)
- Y P/S :
-
Product yield on the utilized substrate
- Y X/S :
-
Biomass yield on the utilized substrate
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Acknowledgment
The authors acknowledge the Ministry of New and Renewable Energy for providing NRE fellowship to Ms. Amrita Ranjan. The infrastructural and analytical facilities provided by Centre for Energy and Department of Chemical Engineering, IIT Guwahati, and Spectrophotometric analysis facility provided by CIF, IIT Guwahati, are also acknowledged.
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Ranjan, A., Mayank, R. & Moholkar, V.S. Process optimization for butanol production from developed rice straw hydrolysate using Clostridium acetobutylicum MTCC 481 strain. Biomass Conv. Bioref. 3, 143–155 (2013). https://doi.org/10.1007/s13399-012-0062-2
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DOI: https://doi.org/10.1007/s13399-012-0062-2