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Energies 2014, 7(2), 767-784; doi:10.3390/en7020767

Energy and GHG Analysis of Rural Household Biogas Systems in China

*  and
State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Beijing Normal University, Beijing 100875, China
* Author to whom correspondence should be addressed.
Received: 20 November 2013 / Revised: 24 January 2014 / Accepted: 29 January 2014 / Published: 17 February 2014
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The Chinese government has taken great efforts to popularize rural household scale biogas digesters, since they are regarded as an effective approach to address energy shortage issues in rural areas and as a potential way of reducing greenhouse gas (GHG) emissions. Focusing on a typical rural household biogas system, the aim of this study is to systematically quantify its total direct and indirect energy, concentrating on non-renewable energy and the associated GHG emission cost over the entire life cycle to understand its net dynamic benefits. The results show that the total energetic cost for biogas output is 2.19 J/J, of which 0.56 J is from non-renewable energy sources and the GHG emission cost is 4.54 × 10−5 g CO2-equivalent (CO2-eq), with respect to its design life cycle of 20 years. Correspondingly, a net non-renewable energy saving of 9.89 × 1010 J and GHG emission reduction of 50.45 t CO2-eq can be obtained considering the coal substitution and manure disposal. However, it must be run for at least 10 and 3 years, to obtain positive net non-renewable energy savings and GHG emission reduction benefits, respectively. These results have policy implications for development orientation, follow-up services, program management and even national financial subsidy methods.
Keywords: household biogas digester; embodied energy; greenhouse gas (GHG) emission reduction household biogas digester; embodied energy; greenhouse gas (GHG) emission reduction
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Zhang, L.; Wang, C. Energy and GHG Analysis of Rural Household Biogas Systems in China. Energies 2014, 7, 767-784.

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