Nonrenewable Energy Cost and Greenhouse Gas Emissions of a “Pig-Biogas-Fish” System in China

Table 3

Direct GHG emissions of the “pig-biogas-fish” system.

Direct GHG	CO2 (kg/yr)	CH4 (kg/yr)	N2O (kg/yr)
Pigsty		12.00*
Biogas	830.50**		1.14***
Fishpond****	646.88	45.36

*IPCC [26].
**Biogas composition is considered as 70% CH₄ and 30% CO₂.
***Ma  and Nan [27].
****Xing et al. [28].