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

Table 2

 FE cost and GE_in emissions of the “pig-biogas-fish” system.

Links	Materials	Quantity	Unit	𝐶^∗𝑖(MJ/unit)	𝐺^∗𝑖 (kg CO2-eq/unit)	FE (MJ/yr)	GEin (kg CO2-eq/yr)
Pigsty	Cement	1.75𝐸+01	kg/yr	6.36	0.53	1.11𝐸+02	9.28𝐸+00
	Lime	1.25𝐸+01	kg/yr	4.94	0.79	6.18𝐸+01	9.88𝐸+00
	Hollow bricks	1.50𝐸+00	kg/yr	6.36	0.53	9.54𝐸+00	7.95𝐸−01
	Steel	2.63𝐸+00	kg/yr	64.5	2.03	1.69𝐸+02	5.33𝐸+00
	Feed	2.90𝐸+03	kg/yr	4.64	0.52	1.35𝐸+04	1.51𝐸+03
	Drugs	4.80𝐸−02	kg/yr	134	3.00	6.43𝐸+00	1.44𝐸−01
	Disinfectant	4.00𝐸−01	kg/yr	46.9	1.68	1.88𝐸+01	6.72𝐸−01
	Water	5.66𝐸+01	ton/yr	34.6	0.81	1.96𝐸+03	4.58𝐸+01
	Electricity	6.40𝐸+01	kWh/yr	135	2.82	8.64𝐸+03	1.80𝐸+02
Biogas	Cement	4.50𝐸+01	kg/yr	6.36	0.53	2.86𝐸+02	2.39𝐸+01
	Sand and pebble	3.13𝐸+00	$/yr	2.98	0.00	9.33𝐸+00	0.00𝐸+00
	Plastic pipe	4.00𝐸+00	kg/yr	108	2.99	4.32𝐸+02	1.20𝐸+01
	Steel mold	1.25𝐸+02	kg/yr	173	2.24	2.16𝐸+04	2.80𝐸+02
Fishpond	Lime	4.80𝐸+02	kg/yr	4.94	0.78	2.37𝐸+03	3.74𝐸+02
	Bleach	3.20𝐸+00	kg/yr	46.9	1.68	1.50𝐸+02	5.38𝐸+00
	Feed	2.50𝐸+02	kg/yr	4.64	0.52	1.16𝐸+03	1.30𝐸+02
	Aerator	1.25𝐸+00	$/yr	32.4	2.24	4.05𝐸+01	2.80𝐸+00
	Nitrogen	2.00𝐸+02	kg/yr	67.8	1.64	1.36𝐸+04	3.28𝐸+02
	Phosphate	1.10𝐸+02	kg/yr	36.2	1.05	3.98𝐸+03	1.16𝐸+02
Total						6.80𝐸+04	3.03𝐸+03

*Zhou [24].