"Bharat Shrestha" <bharatbabu3@hotmail.com> asked:
> 2)What are the major factors affecting the efficiency of bio-gas production?
>
> 3) What is relation between efficiency of bio-gas production and fertility
> of effluent/compost ?

I see the major factors affecting biogas production as temperature, retention time, organic loading rate and to some extent C:N ratio (see earlier discussion)- assuming that no inhibitory substances are present.  The combination of retention time and temperature also affect pathogen survival but I have very little data on this area as yet.

I have set up an EXCEL model for a Continuous Flow Stirred Tank digester which may help anyone interested in looking at how temperature, retention time and VS interact - please e-mail paul.harris@adelaide.edu.au direct if you want a copy (do not reply to the list).

n:Harris;Paul
tel;fax:+61 8 8303 7979
tel;work:+61 8 8303 7880
url:http://www.roseworthy.adelaide.edu.au/~pharris
org:The University of Adelaide;Agronomy & Farming Systems
email;internet:paul.harris@adelaide.edu.au