Every mu (Chinese acre) firewood chopped absorb 0.6 tons less CO2 |
Every kg of coal burnt produces 1.2 kg of CO2 |
ShaanxiVillage Biogas Benefit |
An 8-10 cubic meter biogas well can produce 380-450 cubic meters of gas, supplies fuel for a household of 3-5 persons for 10-12 months.It is equivalent to a saving of 1000 kg coal, 200 kwh or 3 mu of firewood. |
ShaanxiVillage Carbon Footprint |
Household burning 1000 kg of coal a year produces |
=1000 kg x 1.2 kg |
=1200 kg (1.2 tons) CO2 |
Household burning 3 mu of firewood a year produces |
=3 mu x 0.6 tons |
=1.8 tons CO2 |
Household burning coal & firewood a year produces |
=(1.2 + 1.8) tons CO2 |
=3 tons CO2 |
The Village Biogas Scheme |
Cost of building one biogas household (retrofit pigsty, toilet & kitchen costs) |
=RMB $3600 |
Sharing of costs=one third paid by household (RMB $1200) |
=one third subsidized by local government (RMB $1200) |
=one third by donor (RMB $1200) |
Lifespan of biogas well with long-term maintenance |
=20 years |
Carbon Offset Cost Estimation |
Coal burning household switches to biogas |
=$3600 divided by (20 yr. x 1.2 tons) |
=$150 per ton |
Firewood burning household switches to biogas |
=$3600 divided by (20yr x 1.8 tons) |
=$100 per ton |
Coal & firewood burning household switches to biogas |
=$3600 divided by (20yr x (1.2 + 1.8)tons) |
=$60 per ton |
Donor Carbon Offset Estimation |
Donor contribution of $1200 can help one household build biogas facility. Supplemented bytwo-thirds funding from local government & villagers |
Funding coal burning household switch to biogas offsets |
=$1200 divided by $150 |
=8 tons CO2 |
Funding firewood burning household switch to biogas offsets |
=$1200 divided by $100 |
=12 tons CO2 |
Funding coal & firewood burning household switch to biogas offsets |
=$1200 divided by $60 |
=20 tons |
Addition ecological benefits |
A comparison of villages that use biogas with villages that use conventional fuels such as coal and firewood produced the following benefits: |
CO carbon monoxide density reduced by 80% |
CO2 carbon dioxide density reduced by 60% |
SO2 sulphur dioxide density reduced by 80% |
Dust & fumes reduced by 90% |
Visit www.cuncaoxin.org for detail info about the ShaanxiVillage Biogas |
“The Sunflower Project” |
Email: meing@foe.org.hk |
