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Long chain fatty acids degradation in anaerobic digester: Thermodynamic equilibrium consideration

Paper ID Volume ID Publish Year Pages File Format Full-Text
35111 45076 2010 11 PDF Available
Title
Long chain fatty acids degradation in anaerobic digester: Thermodynamic equilibrium consideration
Abstract

The biological oxidations and reductions occurring in batch anaerobic digesters may approach equilibrium. The approach depends strongly on the activities of the micro-organisms present. The thermodynamics of linear long chain fatty acid degradation in a batch reactor was modeled. The substrates considered are the saturated fatty acids from acetic acid to stearic acid. From the thermodynamic perspective, the fermentation (acidogenesis and acetogenesis), decomposing the long chain saturated fatty acids to acetic acid though shorter chain acids, could not proceed spontaneously (ΔH ≫ 0 and ΔG ≫ 0). However the model suggests that the major driving force for the fermentation may be found in the methanogenesis. The model results show two distinct cases: (ΔS > 0 and ΔH > 0) and (ΔS < 0 and ΔH < 0), relating to spontaneous but endothermic and non-spontaneous but exothermic processes respectively. Where, spontaneous digestion is associated with high initial concentrations of LCFA and endotherm. This implies that the digestion of this type of substrate might be better facilitated by the supply of supplemental heat. The digestion of very low concentrations of LCFA is found to be non-spontaneous due in large part to the solubility of carbon dioxide. This implies that the digestion of this type of substrate might be enabled by selectively removing carbon dioxide.

Keywords
Thermodynamics; Anaerobic digestion; Long chain fatty acids; Short chain fatty acids; Interspecies; Electron transfer
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Long chain fatty acids degradation in anaerobic digester: Thermodynamic equilibrium consideration
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 45, Issue 3, March 2010, Pages 335–345
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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