## 3 Results
### Emissions of NH\({}_{3}\) and GHGs during the Composting  
As shown in Figure 4a, the maximum values of NH\({}_{3}\) emission were 1120.01 mg/kg/day DM, 701.17 mg/kg/day DM, and 757.55 mg/kg/day DM for C1, I1, and I2, respectively. Two weeks later, no NH\({}_{3}\) emissions could be detected in the three treatments. Throughout the whole composting process, the cumulative NH\({}_{3}\) emissions of C1, I1 and I2 treatments were 3041.90 mg/kg DM, 2300.53 mg/kg DM and 2455.68 mg/kg DM, accounting for 74.37%, 61.86% and 63.94% of TN losses, respectively. C1 treatment has the highest cumulative NH\({}_{3}\) emissions. I1 and I2 treatments reduced NH\({}_{3}\) emissions by 24.37% and 19.27% compared to C1 treatment, respectively. Data analysis showed that there were significant differences of NH\({}_{3}\) accumulation between the treatments with continuous aeration (C1) and intermittent aeration (I1 and I2) (\(p<0.05\)), but the difference between I1 and I2 was not significant.  
Figure 4: Emissions and accumulations of NH\({}_{3}\) (**a**), N\({}_{2}\)O (**b**), CO\({}_{2}\) (**c**) and CH\({}_{4}\) (**d**) during the composting. The error bars are standard deviation (\(n=3\)).  
Large amounts of N\({}_{2}\)O emissions were detected in the first three days of composing (Figure 4b). The peak of N\({}_{2}\)O emission of C1, I1, and I2 treatments reached 30.14 mg/kg/day DM, 37.83 mg/kg/day DM and 56.53 mg/kg/day DM, respectively. During the maturation phase, the second peak of N\({}_{2}\)O emissions was observed in I1 and I2 treatments, while the emission of C1 treatment was very low. Throughout the whole composite process, the cumulative N\({}_{2}\)O emissions of C1, I1, and I2 treatments were 93.13 mg/kg DM, 113.82 mg/kg DM and 133.31 mg/kg DM, respectively. The data analysis showed that the cumulative N\({}_{2}\)O emissions of I2 were significantly higher than that of C1 and C2.  
CO\({}_{2}\) emission flux during composite of all treatments is shown in Figure 4c, which increased rapidly in the early stage and peaked value 112.86 g, 84.27 g, and 75.67 g on day 4, respectively, and then gradually decreased by the end of the thermophilic phase. CO\({}_{2}\) emissions of all three treatments during the thermophilic period account for more than 70% of total CO\({}_{2}\) emissions. The cumulative CO\({}_{2}\) emission of C1 treatment (636.91 g/kg DM) was the highest, which was 13.01% and 20.72% higher than that of I1 and I2 treatment, respectively.  
The evolution trend of CH\({}_{4}\) emission of all treatments showed an initial sharp increase and peaked within a few days, and then decrease (Figure 4d). The peak values were recorded on the first day and ranged between 314.34 mg/kg DM and 427.70 mg/kg. The intermittent aeration treatments (I1 and I2) had higher CH\({}_{4}\) emission peaks compared to continuous aeration treatment. By the end of composting, the CH\({}_{4}\) accumulation of C1, I1 and I2 were 931.23 mg/kg DM, 751.48 mg/kg DM and 1203.63 mg/kg DM, respectively. Among the three aeration treatments, I2 treatment has the highest CH\({}_{4}\) accumulation. Meanwhile, the cumulative CH\({}_{4}\) emission from I1 was lower than that from C1. The data analysis showed that there were significant differences in cumulative CH\({}_{4}\) emission among the three treatments (\(p<0.05\)).