[Digestion] Biogas yields for tropical energy crops

[Warren Weisman]

I think there's so little and so much conflicting data
is that digestion is not an exact science. A small,
well-maintained digester can out-perform a big, fancy
one. The second most important aspect of digestion,
after an airtight environment, is the proper carbon to
nitrogen ratio, which I did not see referred to in the
article. 

Here's the volumes from "A Chinese Biogas Manual",
which I consider the best source of information on
digestion and biogas, since its empirical data
gathered from making MILLIONS of digesters...

volumes are per tonne of material:

General Stable Manure 260-280 cu.m. gas  50-60% CH4
Pig Manure 561 cu.m. gas  
Horse Manure 200-300 cu.m. gas
Rice husks  615 cu.m. gas
Fresh grass   630 cu.m. gas   70% CH4
Flax stalks or hemp   359 cu.m. gas  59% CH4
Straw       342 cu.m. gas 59% CH4
Leaves from trees   210-294 cu.m. gas   58% CH4
Potato plant leaves & vine, etc.  260-280 cu.m.
Sunflower leaves & stalks  300 cu.m. 58% CH4
Sludge   640 cu.m.     50% CH4
Waste water from wine or spirits making 300-600 cu.m.
58% CH4

--- Lou Dobb <congoagriculture at yahoo.com> wrote:

> Hi all, I'm new to this mailing list. Thanks for the
> very interesting resources and discussions. 
> 
> I have been trying to find some data on biogas
> yields for tropical energy crops (such as sugarcane,
> sweet sorghum, cassava, sweet potato, grass species,
> tropical sugar beet, etc...). But I can't find much.
> 
> In my search I only found data on crops grown in
> temperate and even cold climates (Finland). 
> 
> E.g. Annimari Lehtomäki: "Biogas production from
> energy crops and crop residues", Jyväskylä Studies
> in Biological and Environmental Sciences 163, PhD
> Dissertation, Faculty of Mathematics and Sciences,
> University of Jyväskylä, 2006.
> 
> http://dissertations.jyu.fi/studbiol/9513925595.pdf
> 
> Could anyone help me compile a list of yields for
> tropical crops?
> 
> We could use the list for a wiki, as a basic
> reference.
> 
> 
> How come there are so little data on this? I don't
> understand.
> 
> Best regards,
> Lou
> 
>        
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> 



       
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