Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6482289 | Biochemical Engineering Journal | 2018 | 29 Pages |
Abstract
The correlations between kinetic parameters and both operational conditions and process performance during the anaerobic digestion of food waste were investigated. Substrate concentration (SC), biomass concentration (BC), and substrate-inoculum ratio (S/I) were selected as the operational conditions, while first-order and modified Gompertz models were introduced to evaluate digestion kinetics. The results indicated that no significant correlations between both hydrolysis and methanogenesis kinetic parameters (k and Rm) relative to the operational conditions and process parameters could be determined; however, k/Rmâ² was observed to significantly correlate with these parameters. Specifically, substrate load (both SC and S/I) positively influenced k/Rmâ² via its impact on volatile fatty acid (VFA) and pH, while BC reduced k/Rmâ² by increasing the alkalinity of the system. Moreover, k/Rmâ² was negatively correlated with process efficiency. The methane recovery rate exceeded 90% when 1.55 < k/Rmâ²Â < 3.13, but decreased by 50% when k/Rmâ²Â > 4.64 (p = 0.05). These findings provide a scientific foundation for predicting the behavior of anaerobic systems and optimizing the digestion process.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Bioengineering
Authors
Lei Li, Qin He, Xiaofei Zhao, Di Wu, Xiaoming Wang, Xuya Peng,