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re: manure digestion systems
17 may 2000
steve spence wrote:
>http://waste2profits.com/articles.htm
>an anaerobic digester is a completely closed (oxygen free) system
>that receives and biologically treats manure with naturally occurring
>organism. a successful system is easy to operate...
they are usually a lot slower than aerobic systems (altho they don't
require multi-horsepower air pumps.) that makes the tanks a lot larger
for the same level of treatment. one local sewage treatment plant has
a couple of large anaerobic tanks with floating lids for gas collection
and storage. they burn the gas right under the tanks to warm the liquid
it and speed up the process...
anaerobic systems also have a reputation for odors and tricky process
control. digestion sometimes stops (like a stuck wine fermentation) for
no apparent reason, because the ph is off, etc. nraes has an interesting
old "on-farm biogas production handbook" that lists the number of kwh
per cow per day, when the methane is burned in a generator, and so on.
nick
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