Table 7 Uncertainty of emission factors of different discharge pathways.
From: Greenhouse gas emissions from municipal wastewater treatment facilities in China from 2006 to 2019
| Â | Â | CH4 | N2O | CO2 | |||
|---|---|---|---|---|---|---|---|
1 | Direct discharge into seas | −94% | 80% | −90% | 1394% | −12% | 20% |
2 | Direct discharge into rivers, lakes, reservoirs etc. | −65% | 52% | −90% | 1394% | −12% | 20% |
3 | Enter sewers first, then discharge into rivers, lakes, and reservoirs | −65% | 52% | −90% | 1394% | −12% | 20% |
4 | Enter sewers first, then discharge into seas | −94% | 80% | −90% | 1394% | −12% | 20% |
5 | Enter municipal WWPTs | — | — | — | — | — | — |
6 | Direct discharge into sewage irrigated farmland | Â | Â | 100% | 116% | Â | Â |
7 | Discharge into soil | — | — | 100% | 116% | — | — |
8 | Enter other facilities (decentralized wastewater treatment facilities) | — | — | — | — | — | — |
9 | Enter centralized industrial WWTPs | — | — | — | — | — | — |
10 | Other discharge pathways | −100% | 148% | −90% | 1394% | −12% | 20% |
