PreprintArticleVersion 1Preserved in Portico This version is not peer-reviewed
Mesophilic and Thermophilic Fermentation of Waste Activated Sludge for Volatile Fatty Acids Production: Focusing on Anaerobic Degradation of Carbohydrate and Protein
Xiong, H.; Liu, L.; Song, B.; Liu, H.; Shi, H.; Zhu, Y. Mesophilic and Thermophilic Fermentation of Activated Sludge for Volatile Fatty Acids Production: Focusing on Anaerobic Degradation of Carbohydrate and Protein. Environmental Technology 2024, 1–13, doi:10.1080/09593330.2024.2306152.
Xiong, H.; Liu, L.; Song, B.; Liu, H.; Shi, H.; Zhu, Y. Mesophilic and Thermophilic Fermentation of Activated Sludge for Volatile Fatty Acids Production: Focusing on Anaerobic Degradation of Carbohydrate and Protein. Environmental Technology 2024, 1–13, doi:10.1080/09593330.2024.2306152.
Xiong, H.; Liu, L.; Song, B.; Liu, H.; Shi, H.; Zhu, Y. Mesophilic and Thermophilic Fermentation of Activated Sludge for Volatile Fatty Acids Production: Focusing on Anaerobic Degradation of Carbohydrate and Protein. Environmental Technology 2024, 1–13, doi:10.1080/09593330.2024.2306152.
Xiong, H.; Liu, L.; Song, B.; Liu, H.; Shi, H.; Zhu, Y. Mesophilic and Thermophilic Fermentation of Activated Sludge for Volatile Fatty Acids Production: Focusing on Anaerobic Degradation of Carbohydrate and Protein. Environmental Technology 2024, 1–13, doi:10.1080/09593330.2024.2306152.
Abstract
The volatile fatty acids (VFAs) productions, as well as particulate organics decomposition, soluble chemical oxygen demand (SCOD) yield, and the VFAs production pathways, of mesophilic and thermophilic anaerobic fermentation were investigated. Batch experiments showed that the decomposition rate of volatile suspended solids (VSS), particulate carbohydrate (P-C) and particulate protein (P-P) followed the first-order kinetic model at different temperature. However, the intermediates， accumulated in the process of protein or carbohydrate digestion had a more significant inhibitory effect on the production of VFAs during the mesophilic anaerobic acidification process. Thermophilic fermentation led to more accumulation of VFAs compared to mesophilic fermentation. Then 13C stable isotope labeling experiment demonstrated that, acetic (HAc), propionic (HPr) and butyric (HBu) could be produced from carbohydrate and protein digestion, but valeric (HVa) was only generated from the degradation of protein. Finally, the possible pathway of HVa synthesis was proposed.
Environmental and Earth Sciences, Water Science and Technology
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
