Coupling Glucose Fermentation and Homoacetogenesis for Elevated Acetate Production: Experimental and Mathematical Approaches

Ni, Bing-Jie, Liu, He, Nie, Yan-Qiu, Zeng, Raymond J., Du, Guo-Cheng, Chen, Jian and Yu, Han-Qing (2011) Coupling Glucose Fermentation and Homoacetogenesis for Elevated Acetate Production: Experimental and Mathematical Approaches. Biotechnology and Bioengineering, 108 2: 345-353. doi:10.1002/bit.22908


Author Ni, Bing-Jie
Liu, He
Nie, Yan-Qiu
Zeng, Raymond J.
Du, Guo-Cheng
Chen, Jian
Yu, Han-Qing
Title Coupling Glucose Fermentation and Homoacetogenesis for Elevated Acetate Production: Experimental and Mathematical Approaches
Journal name Biotechnology and Bioengineering   Check publisher's open access policy
ISSN 0006-3592
1097-0290
Publication date 2011-02-01
Sub-type Article (original research)
DOI 10.1002/bit.22908
Volume 108
Issue 2
Start page 345
End page 353
Total pages 9
Place of publication Hoboken, NJ United States
Publisher John Wiley and Sons
Language eng
Formatted abstract
Homoacetogenesis is an important potential hydrogen sink in acetogenesis, in which hydrogen is used to reduce carbon dioxide to acetate. So far the acetate production from homoacetogenesis, especially its kinetics, has not been given sufficient attention. In this work, enhanced production of acetate from anaerobic conversion of glucose through coupling glucose fermentation and homoacetogenesis is investigated with both experimental and mathematical approaches. Experiments are conducted to explore elevated acetate production in a coupled anaerobic system. Acetate production could be achieved by homoacetogenesis with a relative high acetate yield under mixed fermentation conditions. With the experimental observations, a kinetic model is formulated to describe such a homoacetogenic process. The maximum homoacetogenic rate (k m,homo) is estimated to be 28.5 ± 1.7 kg COD kg -1 COD day -1 with an uptake affinity constant of 3.7 × 10 -5 ± 3.1 × 10 -6 kg COD m -3. The improved calculation of homoacetogenic kinetics by our approach could correct the underestimation of homoacetogenesis in anaerobic fermentation processes, as it often occurs in these systems supported by literature analysis. The model predictions match the experimental results in different cases well and provide insights into the dynamics of anaerobic glucose conversion and acetate production. Furthermore, acetate production via homoacetogenesis increases by about 40% through utilizing the fed-batch coupling system, attributed to a balance between the hydrogen production in the acetogenesis phase and the hydrogen consumption in the homoacetogenesis phase. This work provides an effective way for increased anaerobic acetate production, and gives us a better understanding about the homoacetogenic kinetics in the anaerobic fermentation process
Keyword Homoacetogenesis
Acetate production
Kinetics
Anaerobic fermentation
Mathematical approaches
Underestimation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Advanced Water Management Centre Publications
 
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