Journal
SUSTAINABILITY
Volume 14, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/su14010447
Keywords
mesophilic anaerobic digestion; thermophilic anaerobic digestion; chicken manure; granular activated carbon; microbial community structure; 16S rRNA gene
Funding
- Russian Foundation for Basic Research [18-29-25058]
- Kazan Federal University Strategic Academic Leadership Program
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This study found that the addition of GAC can enhance the consumption of organic acids and accelerate biomethane production during anaerobic digestion of chicken manure; however, the increase in free ammonia levels in thermophilic reactors may lead to process instability. Additionally, microbial community structures differ at different temperatures.
In this work, the impact of granular activated carbon (GAC) on the mesophilic and thermophilic anaerobic digestion of chicken manure and the structure of microbial communities was investigated. These results demonstrated that GAC supplementation effectively enhanced the consumption of produced organic acids in the mesophilic and thermophilic batch tests, accompanied by faster biomethane production in the presence of GAC than from reactors without GAC. However, since the free ammonia level was 3-6 times higher in the thermophilic reactors, this led to the instability of the anaerobic digestion process of the nitrogen-rich substrate at thermophilic temperatures. Bacteroidia and Clostridia were the two main bacterial classes in the mesophilic reactors, whereas the class Clostridia had a competitive advantage over other groups in the thermophilic systems. The archaeal communities in the mesophilic reactors were mainly represented by representatives of the genera Methanosarcina, Methanobacterium, and Methanotrix, whereas the archaeal communities in the thermophilic reactors were mainly represented by members of the genera Methanosarcina, Methanoculleus, and Methanothermobacter. New data obtained in this research will help control and manage biogas reactors in the presence of GAC at different temperatures.
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