Effects of free long-chain fatty acids on thermophilic anaerobic digestion

1992 ◽  
Vol 37 (6) ◽  
Author(s):  
I. Angelidaki ◽  
B.K. Ahring
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Long Chain Fatty Acids ◽  
Thermophilic Anaerobic Digestion ◽  
Long Chain ◽  
Chain Fatty Acids

Influence of mesophilic and thermophilic conditions on the anaerobic digestion of food waste: Focus on the microbial activity and removal of long chain fatty acids

2018 ◽  
Vol 36 (11) ◽  
pp. 1106-1112 ◽  
Author(s):  
Xiaohui Guo ◽  
Kang Kang ◽  
Gaoyuan Shang ◽  
Xiunan Yu ◽  
Ling Qiu ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Microbial Activity ◽  
Food Waste ◽  
Biogas Production ◽  
Organic Loading Rate ◽  
Long Chain Fatty Acids ◽  
Methanogenic Activity ◽  
Long Chain ◽  
Chain Fatty Acids

The mesophilic reactor (MR) exhibited advantages in biogas production and performance stability over thermophilic reactor (TR) during the long-term anaerobic digestion (AD) of food waste (FW) with stepwise organic loading rate elevating. It was interesting to explore the mechanism causing the divergences in performances between these two reactors. The microbial activity was compared on day 110 when TR began to deteriorate. The results show that MR had significantly higher specific acetoclastic methanogenic activities (SAMA) and specific propionate and butyrate oxidative activities (SPOA and SBOA) than TR. The SAMA, SPOA and SBOA in TR were only 50.3%, 18.6% and 46.4% of those values in MR, respectively. Remarkably, the specific hydrogenotrophic methanogenic activity of 15.5±2.1, 15.7±4.6 mmol CH4·L−1 original slurry·d−1 in MR and TR was comparative with insignificant difference, which indicates that the microbial activity in TR had been inhibited widely apart from the hydrogenotrophic methanogenesis. Additionally, many particles with the diameters of 1–2 mm were observed to form in MR and identified as complexes of calcium and long chain fatty acids (LCFAs). The formation of calcium crystallization might alleviate the inhibition of LCFAs during AD of FW, which further supports the better performance in MR than TR.

scholarly journals Mechanism, kinetics and microbiology of inhibition caused by long-chain fatty acids in anaerobic digestion of algal biomass

2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Jingwei Ma ◽  
Quan-Bao Zhao ◽  
Lieve L. M. Laurens ◽  
Eric E. Jarvis ◽  
Nick J. Nagle ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Algal Biomass ◽  
Long Chain Fatty Acids ◽  
Long Chain ◽  
Chain Fatty Acids

scholarly journals Activity and Viability of Methanogens in Anaerobic Digestion of Unsaturated and Saturated Long-Chain Fatty Acids

2013 ◽  
Vol 79 (14) ◽  
pp. 4239-4245 ◽  
Author(s):  
D. Z. Sousa ◽  
A. F. Salvador ◽  
J. Ramos ◽  
A. P. Guedes ◽  
S. Barbosa ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Long Chain Fatty Acids ◽  
Long Chain ◽  
Chain Fatty Acids
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