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- Title
Effects of ammonia on propionate degradation and microbial community in digesters using propionate as a sole carbon source.
- Authors
Li, Ying; Zhang, Yue; Kong, Xiaoying; Li, Lianhua; Yuan, Zhenhong; Dong, Renjie; Sun, Yongming
- Abstract
BACKGROUND Propionate accumulation may lead to digester failure. This study aimed to investigate the effect of ammonia, a metabolic product of protein, on propionate degradation. The shift of microbial community was also investigated. RESULTS Propionate accumulated over the experimental period in the reactor with a total ammonia nitrogen ( TAN) concentration of 2.5 g N L−1, as a result the digester failed after 4 hydraulic retention times ( HRT) at an organic load rate ( OLR) of 0.8 g propionic acid ( HPr) L−1 d−1. The average HPr degradation rate was below 54% during the fourth HRT, while >97% of the degraded HPr was converted to methane. The reactor without ammonia stress did not experience HPr accumulation and OLR was increased stepwise to 1.2 g L−1 d−1 at the 8th HRT. The average HPr degradation rate and methane recovery rate of this reactor in the last HRT was 99% and 74%, respectively. According to the shifts of microbial community, acetoclastic methanogen was more vulnerable to ammonia than hydrogenotrophic methanogen CONCLUSION TAN concentration of 2.5 g N L−1 inhibited propionate degradation more severely than methanogenesis. The loss of abundance of Clostridiaceae and Syntrophobacter might be the main reason for the poor performance under ammonia stress. © 2017 Society of Chemical Industry
- Subjects
AUTOCLAVES; AMMONIA; PROPIONATES; MICROBIAL communities; BIODEGRADATION
- Publication
Journal of Chemical Technology & Biotechnology, 2017, Vol 92, Issue 10, p2538
- ISSN
0268-2575
- Publication type
Article
- DOI
10.1002/jctb.5260