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- Title
Influence of volatile fatty acids/alkalinity ratio on methane production during mesophilic anaerobic digestion: stability, efficiency and optimization.
- Authors
Elazhar, M.; Bouchabchoub, A.; Elazhar, F.; Elmidaoui, A.; Taky, M.
- Abstract
Biogas production from sugarcane vinasse has enormous economic, energy, and environmental management potential. However, methane production stability remains key issue, hindered by the presence of inhibitory compounds and other characteristics of the vinasse such as volatile fatty acids (VFA), alkalinity and pH. These parameters are identified as potential auxiliary indicators for diagnosing imbalances in the anaerobic digestion (AD) reactor. This study investigates the influence of VFA/alkalinity ratio on reactor stability, efficiency and optimization of continuous AD of vinasse during mesophilic conditions in terms of methane yield production. To this end, a combined experimental and simulation approach is adopted using the response surface methodology (RSM). Results reveal that for VFA/alkalinity ratio in the range of 0.23–0.3, a higher methane yield is obtained reaching up to 4.0 L CH4/L with an organic loading rate of 4.8 kg/m³ d and a VFA less than 30 meq/L. The result of RSM verifies that the methane yield are affected mainly by operating conditions: VFA/alkalinity ratio (A), VFA (B) and pH (C).In addition, linear model values (A, B, C), quadratic model value (A², B², C²), and interactive model values (AB, AC, BC) are found to be significant, with P-values <0.05. The average maximum value of the produced methane is obtained for the following optimum conditions: pH of 7.2, VFA of 10 d, and the VFA/alkalinity ratio of 0.3. These findings provide a scientific foundation for predicting the behavior of anaerobic systems and optimizing the digestion process.
- Subjects
FATTY acids; ALKALINITY; RESPONSE surfaces (Statistics); METHANE as fuel; METHANE; BIOGAS production; VINASSE
- Publication
Desalination & Water Treatment, 2022, Vol 257, p142
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2022.28580