Table 1. Summary of GHG Emission Factor Data for Composting Raw Materialsa.
emission
factor |
||||||
---|---|---|---|---|---|---|
kg pollutant/kg of wet feedstock |
kg CO2e/kg of wet feedstock |
|||||
feedstock | pollutant | mean | median | mean | median | sample size |
manure | CH4 | 2.82 × 10–3 | 1.21 × 10–3 | 7.90 × 10–2 | 3.39 × 10–2 | 41 |
N2O | 3.54 × 10–4 | 1.62 × 10–4 | 1.05 × 10–1 | 4.83 × 10–2 | 45 | |
CO2 | 1.40 × 10–1 | 1.47 × 10–1 | 1.40 × 10–1 | 1.47 × 10–1 | 30 | |
OFMSW | CH4 | 8.79 × 10–4 | 2.43 × 10–4 | 2.46 × 10–2 | 6.80 × 10–3 | 21 |
N2O | 6.80 × 10–5 | 7.50 × 10–5 | 2.03 × 10–2 | 2.24 × 10–2 | 19 | |
CO2 | 5.63 × 10–2 | 4.30 × 10–2 | 5.63 × 10–2 | 4.30 × 10–2 | 3 | |
sludge | CH4 | 2.34 × 10–4 | 4.50 × 10–5 | 6.55 × 10–3 | 1.26 × 10–3 | 7 |
N2O | 8.36 × 10–5 | 4.36 × 10–5 | 2.49 × 10–2 | 1.3 × 10–2 | 7 | |
CO2 | 1.75 × 10–2 | 1.75 × 10–2 | 1.75 × 10–2 | 1.75 × 10–2 | 2 | |
yard waste | CH4 | 2.06 × 10–3 | 1.23 × 10–3 | 5.77 × 10–2 | 3.44 × 10–2 | 7 |
N2O | 4.54 × 10–5 | 2.27 × 10–5 | 1.35 × 10–2 | 6.76 × 10–3 | 7 | |
CO2 | 1.71 × 10–1 | 1.56 × 10–1 | 1.71 × 10–1 | 1.56 × 10–1 | 4 |
Digestate is excluded in this table because of variation in the original raw feedstock materials.