There are examples of small scale household digesters such as the ARTI design which have been created with urban environments in mind as a fuel alternative in developing countries as well as several national biogas programmes many supported by the likes of SNV in Nepal, Cambodia etc. I'm interested to know how wide spread these technologies are and how easy it has been to perpetrate them into the household energy market? Does anyone have any information on this?
I am also aware that capital cost has repeatedly been reported as a major inhibiting factor to the uptake of anaerobic digesters but perhaps much is down to the risks and also that larger scale community digesters require a certain amount of knowledge and expertise for construction, maintenance and repair which particularly in an emergency setting may not be readily available? Perhaps there are also marketing issues as well involved as it is a completely foreign technology in many countries. I don't know if anyone has any experience in this area but am aware SNV have been running a very successful biogas programme as are others who may be able to shed some light on the technology transfer needs in order to make it successful in an emergency setting?