DIG-L: biogas from anaerobic ponds

[b.mcgrath@paradise.net.nz]

Hi, I note Brian Smylas' comment re inactivity on the list, so here 
is some traffic from New Zealand. I am undertaking some postgrad 
research into the temperature dependency of gas generation from 
anaerobic ponds treating farm dairy waste within the psychrophilic 
range (-4 to 20 C). I would welcome any recent references that anyone 
may have ... the journals are a bit slow getting here (like 6 months)
I am particularly interested to hear from anyone who is or has been 
into this area of research. I note that the gas appears to be 
generated in the sludge layers during to colder months and erupts as 
major surface disturbances whereas during summer gas appears to be 
evolved in the surface (supernatent) layers with fewer major "sludge 
eruptions" ... any comments?
I am also attempting to develop a protocol for estimation of gas 
productivity for these ponds such that a quick assessment can be 
made.
Our farm ponds are typically 3.5 to 5.5 metres deep with a surface 
aspect ratio of about 1and have BOD(5) loadings of 0.020 to 0.028 
kg/m^3/d. 
Bob McGrath


DIGESTION List Sponsors, Archive and Information
http://www.crest.org/renewables/digestion-list-archive
http://www.crest.org/renewables/biomass-info/
Beginners Tour of Biogas
http://WWW.roseworthy.adelaide.edu.au/~pharris/biogas/beginners