A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
N₂O emissions and nitrogen transformation during windrow composting of dairy manure
Windrow composting involves piling and regularly turning organic wastes in long rows, being in the succession of static standing periods between two consecutive pile turnings as well as a period of pile turning. N2O emissions and N transformation were investigated during the processes of windrow composting. In contrast to the conventional understanding, we observed that N2O concentrations inside compost materials were significantly higher after pile turning (APT) than before pile turning (BPT). Pile turning triggered a burst of N2O production rather than simple gaseous N2O escape from the stirred compost. Denitrification was the dominant pathway in pile turning because the observed [Formula: see text] and [Formula: see text] concentrations were significantly lower APT compared to BPT. The sudden exposure of O2 severely inhibited N2O reductase, which can block the transformation of N2O to N2 and thus caused an increase of N2O emission. As the [Formula: see text] and [Formula: see text] concentrations rose during the following 48 standing hours, nitrification dominated N transformation and did not cause an increase of surface N2O emissions. Thus, pile turning resulted in a dramatic conversion of N transformation and strongly influenced its flux size. It was also found that high [Formula: see text] was accumulated in the compost and had a strong correlation with N2O emissions. Practical methods regulating nitrite and the frequency of pile turning would be useful to mitigate N2O emissions in manure composting.
N₂O emissions and nitrogen transformation during windrow composting of dairy manure
Windrow composting involves piling and regularly turning organic wastes in long rows, being in the succession of static standing periods between two consecutive pile turnings as well as a period of pile turning. N2O emissions and N transformation were investigated during the processes of windrow composting. In contrast to the conventional understanding, we observed that N2O concentrations inside compost materials were significantly higher after pile turning (APT) than before pile turning (BPT). Pile turning triggered a burst of N2O production rather than simple gaseous N2O escape from the stirred compost. Denitrification was the dominant pathway in pile turning because the observed [Formula: see text] and [Formula: see text] concentrations were significantly lower APT compared to BPT. The sudden exposure of O2 severely inhibited N2O reductase, which can block the transformation of N2O to N2 and thus caused an increase of N2O emission. As the [Formula: see text] and [Formula: see text] concentrations rose during the following 48 standing hours, nitrification dominated N transformation and did not cause an increase of surface N2O emissions. Thus, pile turning resulted in a dramatic conversion of N transformation and strongly influenced its flux size. It was also found that high [Formula: see text] was accumulated in the compost and had a strong correlation with N2O emissions. Practical methods regulating nitrite and the frequency of pile turning would be useful to mitigate N2O emissions in manure composting.
N₂O emissions and nitrogen transformation during windrow composting of dairy manure
Chen, Ruirui (author) / Wang, Yiming / Wang, Wei / Wei, Shiping / Jing, Zhongwang / Lin, Xiangui
2015
Article (Journal)
English
BKL:
43.00
N.sub.2O emissions and nitrogen transformation during windrow composting of dairy manure
| Online Contents | 2015
Windrow Composting Site Design
| British Library Conference Proceedings | 1994
Greenhouse gas emissions from windrow composting of organic wastes: Patterns and emissions factors
| DOAJ | 2019
Microplastics Release from Conventional Plastics during Real Open Windrow Composting
| DOAJ | 2022