Abstract
Microbial fermentations are well recognized process for large-scale bioconversion of organic waste biomass into high-value organic acids. It requires processes optimization, i.e., that should reach at maximum productivity and no feedback inhibition, to reduce the cost of up- and down-stream processing for commercialization. To achieve this, triggered metabolic activities are often needed that maximize the conversion of organic carbon into organic acids under non-sterile conditions. By regulating the redox balance in-situ, the specific organic acid production could be tailored in fermentation systems under mixed/mono-culture conditions. In recent years, bio-electro-fermentations (BEF) has developed as a promising approach for organic waste conversion into value products due to its sustainable nature but yet required better understand for further development. In BEF, the fermentative metabolic pathways are enhanced with poising electrodes that facilitate effective electron transfers towards end-product recovery. It is expected to maintain the required redox conditions and buffer the system by regulating reducing equivalents e.g. NADH+ during fermentation. Moreover, microorganisms extract energy required to build biomass (anabolic process) from redox reactions (catabolism) through syntrophic interactions in BEF, while feedback inhibition of process could be overcome. In this chapter, we will elaborate the BEF process for organic acid production (mainly succinic, acetic, and muconic acids) and techno-economics of the process for commercialization.
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Abbreviations
- AA:
-
Acetic acid
- AD:
-
Anaerobic digestion
- BEF:
-
Bio-electro-fermentations
- CA:
-
Citric acid
- CAPEX:
-
Capital expenditure
- ccMA:
-
cis,cis-muconic acid
- ctMA:
-
cis,trans-muconic acid
- EET:
-
Extracellular electron transfer
- EF:
-
Electro-fermentation
- frd :
-
Fumarate reductase
- fum :
-
Fumarase
- LA:
-
Lactic acid
- LCA:
-
Life cycle assessment
- MA:
-
Muconic acid
- mdh :
-
Malate dehydrogenase
- MMC:
-
Mixed microbial cultures
- OW:
-
Organic waste
- ppc :
-
PEP carboxylase
- pck :
-
PEP carboxykinase
- pyc :
-
Pyruvate carboxylase
- SA:
-
Succinic acid
- TEA:
-
Techno-economic analysis
- ttMA:
-
trans,trans-muconic acid
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Nagendranatha Reddy, C. et al. (2020). Electro-Fermentation of Biomass for High-Value Organic Acids. In: Verma, P. (eds) Biorefineries: A Step Towards Renewable and Clean Energy. Clean Energy Production Technologies. Springer, Singapore. https://doi.org/10.1007/978-981-15-9593-6_16
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