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Effects of temperature and carbon-nitrogen (C/N) ratio on the performance of anaerobic co-digestion of dairy manure, chicken manure and rice straw: focusing on ammonia inhibition.

Wang X, Lu X, Li F, Yang G - PLoS ONE (2014)

Bottom Line: The increase of C/N ratios reduced the negative effects of ammonia and maximum methane potentials were achieved with C/N ratios of 25 and 30 at 35°C and 55°C, respectively.When temperature increased, an increase was required in the feed C/N ratio, in order to reduce the risk of ammonia inhibition.Our results revealed an interactive effect between temperature and C/N on digestion performance.

View Article: PubMed Central - PubMed

Affiliation: College of Agronomy, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.

ABSTRACT
Anaerobic digestion is a promising alternative to disposal organic waste and co-digestion of mixed organic wastes has recently attracted more interest. This study investigated the effects of temperature and carbon-nitrogen (C/N) ratio on the performance of anaerobic co-digestion of dairy manure (DM), chicken manure (CM) and rice straw (RS). We found that increased temperature improved the methane potential, but the rate was reduced from mesophilic (30∼40°C) to thermophilic conditions (50∼60°C), due to the accumulation of ammonium nitrogen and free ammonia and the occurrence of ammonia inhibition. Significant ammonia inhibition was observed with a C/N ratio of 15 at 35°C and at a C/N ratio of 20 at 55°C. The increase of C/N ratios reduced the negative effects of ammonia and maximum methane potentials were achieved with C/N ratios of 25 and 30 at 35°C and 55°C, respectively. When temperature increased, an increase was required in the feed C/N ratio, in order to reduce the risk of ammonia inhibition. Our results revealed an interactive effect between temperature and C/N on digestion performance.

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Effects of temperature on methane potential in mixtures with a C/N ratio of 25.Values are presented as the mean ±standard error of three replicates (n = 3). Vertical bars represent LSD at the 5% level.
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pone-0097265-g001: Effects of temperature on methane potential in mixtures with a C/N ratio of 25.Values are presented as the mean ±standard error of three replicates (n = 3). Vertical bars represent LSD at the 5% level.

Mentions: With the increase of temperature, methane potential continuously increased, but the increasing rate was lower under thermophilic than under mesophilic conditions (Fig. 1). The mixture of DM+CM+RS had a little higher methane potential than the mixtures of DM+RS and CM+RS.


Effects of temperature and carbon-nitrogen (C/N) ratio on the performance of anaerobic co-digestion of dairy manure, chicken manure and rice straw: focusing on ammonia inhibition.

Wang X, Lu X, Li F, Yang G - PLoS ONE (2014)

Effects of temperature on methane potential in mixtures with a C/N ratio of 25.Values are presented as the mean ±standard error of three replicates (n = 3). Vertical bars represent LSD at the 5% level.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4016299&req=5

pone-0097265-g001: Effects of temperature on methane potential in mixtures with a C/N ratio of 25.Values are presented as the mean ±standard error of three replicates (n = 3). Vertical bars represent LSD at the 5% level.
Mentions: With the increase of temperature, methane potential continuously increased, but the increasing rate was lower under thermophilic than under mesophilic conditions (Fig. 1). The mixture of DM+CM+RS had a little higher methane potential than the mixtures of DM+RS and CM+RS.

Bottom Line: The increase of C/N ratios reduced the negative effects of ammonia and maximum methane potentials were achieved with C/N ratios of 25 and 30 at 35°C and 55°C, respectively.When temperature increased, an increase was required in the feed C/N ratio, in order to reduce the risk of ammonia inhibition.Our results revealed an interactive effect between temperature and C/N on digestion performance.

View Article: PubMed Central - PubMed

Affiliation: College of Agronomy, Northwest A&F University, Yangling, Shaanxi, People's Republic of China.

ABSTRACT
Anaerobic digestion is a promising alternative to disposal organic waste and co-digestion of mixed organic wastes has recently attracted more interest. This study investigated the effects of temperature and carbon-nitrogen (C/N) ratio on the performance of anaerobic co-digestion of dairy manure (DM), chicken manure (CM) and rice straw (RS). We found that increased temperature improved the methane potential, but the rate was reduced from mesophilic (30∼40°C) to thermophilic conditions (50∼60°C), due to the accumulation of ammonium nitrogen and free ammonia and the occurrence of ammonia inhibition. Significant ammonia inhibition was observed with a C/N ratio of 15 at 35°C and at a C/N ratio of 20 at 55°C. The increase of C/N ratios reduced the negative effects of ammonia and maximum methane potentials were achieved with C/N ratios of 25 and 30 at 35°C and 55°C, respectively. When temperature increased, an increase was required in the feed C/N ratio, in order to reduce the risk of ammonia inhibition. Our results revealed an interactive effect between temperature and C/N on digestion performance.

Show MeSH
Related in: MedlinePlus