household digesters. However, the interesting paradox is, despite all the benefits that could be gained,
the interest fades as soon as the governmental subsidy support is reduced, as the case in China which is
the one of leading countries in adopting the biogas digesters. It seems the benefit from implementation
of biogas digester alone is not enough to increase the attention. Further, full analysis are needed with a
new approach to facilitate communication between the experts from different fields such as
engineering, hydrology, biology, social science, economics and systems-modeling to identify and find
the best possible optimum solution and strategies needed in implementing household biogas digesters
in rural communities [208]. Furthermore, interest is growing slowly in many poor countries and effort
should be made to increase the awareness and to introduce affordable and more efficient digesters
tailored to take full advantage of the local possibilities in order to succeed.