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re: combustion value of wood
25 jun 1997
jim anderson wrote:
>nick pine wrote:
>> i'm thinking about mostly leaves for starters...
>one thing that ups your decay rate is churning the material.
i was hoping to avoid that, in something like a naturally powered "aerated
static pile." some published decay rates are 0.0015 kg/kg/day for maple leaves
and 0.009 for oak, ie a time constant of 111 days. leaves have a c:n ratio of
something like 50, and need more nitrogen and water (up to 20 gallons/yard^3)
to make good compost. from sewage sludge?
>what happens is that some of the material will not have surface that is
>exposed to the bacteria. when you churn it and break it up it decomposes
>faster due to the increase in new surface area that can be affected.
i wonder if there are other ways to encourage that, eg sprinking the
leachate back over the pile.
>also be careful about gas leakage. it's useful if you can capture it
>but explosive if you can't control it.
i was thinking about a mostly closed system, condensing the water out of the
gas, vs the usual way, allowing water vapor and heat to escape via convection.
nick
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