Limits...
Spatial nitrifications of microbial processes during composting of swine, cow and chicken manure.

Wang K, Li W, Li X, Ren N - Sci Rep (2015)

Bottom Line: Here, we show the evolution of the interior microenvironment of swine, cow and chicken manure by using microelectrodes during forced-aeration composting.Composting has generally been regarded as an aerobic bioprocess, however, the long-existing of a large anoxic zone inside these manures was confirmed during the active phase in this study.These founding provided a new insight toward "aerobic" composting process and a sound foundation for the development of efficient composting technology.

View Article: PubMed Central - PubMed

Affiliation: School of Municipal and Environmental Engineering, State Key Laboratory of Urban Water Resource and Environment (SKLUWER), Harbin Institute of Technology, 73 Huanghe road, Harbin, Heilongjiang 150090, China.

ABSTRACT
Composting is a widely-used method to recycle the nutrients in livestock manure for agriculture. The spatial stratifications of microbial processes inside the manure particle that determine organic and nitrogen transformation are virtually unclear. Here, we show the evolution of the interior microenvironment of swine, cow and chicken manure by using microelectrodes during forced-aeration composting. Composting has generally been regarded as an aerobic bioprocess, however, the long-existing of a large anoxic zone inside these manures was confirmed during the active phase in this study. The profile of the oxidation-reduction potential dramatically decreased first and then gradually increased. The spatial difference in the ammonia concentration was not significant, but nitrate concentration continuously decreased with depth. The anoxic condition within the manure particle was demonstrated to be a primary cause of the severe ammonia emission and the long composting period. These founding provided a new insight toward "aerobic" composting process and a sound foundation for the development of efficient composting technology.

No MeSH data available.


Related in: MedlinePlus

Spatial distribution of nitrate concentration with depth in the microprofile of the manure particles of chicken (a), cow (b) and swine (c) on Day-0, Day-10, Day-20 and Day-30.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4595641&req=5

f5: Spatial distribution of nitrate concentration with depth in the microprofile of the manure particles of chicken (a), cow (b) and swine (c) on Day-0, Day-10, Day-20 and Day-30.

Mentions: The concentration in the core zone of the three manures first decreased and then gradually increased with composting time (Fig. 5a–c). During the first 20 days, the concentration in the 2 mm depth region was reduced from 15.8 to 6.6 mmol L−1 for the chicken manure, from 11.9 to 4.1 mmol L−1 for the swine manure and from 3.1 to 1.5 mmol L−1 for the cow manure, indicating that the could be used as the electron acceptor by the microbes in the anoxic zone, and that the denitrification occurred in the active composting.


Spatial nitrifications of microbial processes during composting of swine, cow and chicken manure.

Wang K, Li W, Li X, Ren N - Sci Rep (2015)

Spatial distribution of nitrate concentration with depth in the microprofile of the manure particles of chicken (a), cow (b) and swine (c) on Day-0, Day-10, Day-20 and Day-30.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4595641&req=5

f5: Spatial distribution of nitrate concentration with depth in the microprofile of the manure particles of chicken (a), cow (b) and swine (c) on Day-0, Day-10, Day-20 and Day-30.
Mentions: The concentration in the core zone of the three manures first decreased and then gradually increased with composting time (Fig. 5a–c). During the first 20 days, the concentration in the 2 mm depth region was reduced from 15.8 to 6.6 mmol L−1 for the chicken manure, from 11.9 to 4.1 mmol L−1 for the swine manure and from 3.1 to 1.5 mmol L−1 for the cow manure, indicating that the could be used as the electron acceptor by the microbes in the anoxic zone, and that the denitrification occurred in the active composting.

Bottom Line: Here, we show the evolution of the interior microenvironment of swine, cow and chicken manure by using microelectrodes during forced-aeration composting.Composting has generally been regarded as an aerobic bioprocess, however, the long-existing of a large anoxic zone inside these manures was confirmed during the active phase in this study.These founding provided a new insight toward "aerobic" composting process and a sound foundation for the development of efficient composting technology.

View Article: PubMed Central - PubMed

Affiliation: School of Municipal and Environmental Engineering, State Key Laboratory of Urban Water Resource and Environment (SKLUWER), Harbin Institute of Technology, 73 Huanghe road, Harbin, Heilongjiang 150090, China.

ABSTRACT
Composting is a widely-used method to recycle the nutrients in livestock manure for agriculture. The spatial stratifications of microbial processes inside the manure particle that determine organic and nitrogen transformation are virtually unclear. Here, we show the evolution of the interior microenvironment of swine, cow and chicken manure by using microelectrodes during forced-aeration composting. Composting has generally been regarded as an aerobic bioprocess, however, the long-existing of a large anoxic zone inside these manures was confirmed during the active phase in this study. The profile of the oxidation-reduction potential dramatically decreased first and then gradually increased. The spatial difference in the ammonia concentration was not significant, but nitrate concentration continuously decreased with depth. The anoxic condition within the manure particle was demonstrated to be a primary cause of the severe ammonia emission and the long composting period. These founding provided a new insight toward "aerobic" composting process and a sound foundation for the development of efficient composting technology.

No MeSH data available.


Related in: MedlinePlus