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<div style="font-family: monospace, courier new, courier">Hi All,</div>
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<div style="font-family: monospace, courier new, courier">I have been
approached to put together a proposal for a centralised AD using the manure
from 5000 dairy cows. The intention is to pre-concentrate the dairy manure
slurry and to truck the solids to a central processing unit. As silage and
grass is extensively used as feed, we would be able to co-digest this with
the manure to increase the gas output. Furthermore, it is intended to use
the exhaust gas and the AD liquor to grow macro algae or a plant such as
hyacinth (an indigenous variety that is not likely to become an invader
should it get out) which can be shredded and added back to digestion. We aim
to use the gas for power generation and to use the heat to keep the
digester(s) warm.</div>
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<div style="font-family: monospace, courier new, courier">Questions:</div>
<div style="font-family: monospace, courier new, courier">1. By leaving the
water behind, do we lose most/all/some of the FFA? What impact would it have
on gas production?</div>
<div style="font-family: monospace, courier new, courier">2. Can anyone
recommend a supplier of technology for this size of plant?</div>
<div style="font-family: monospace, courier new, courier">3. 5000 cows is an
arbitrary amount at this stage - 10 farms of 500 cows each. Is there a
better/more economical size?</div>
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<div style="font-family: monospace, courier new, courier">Kind regards</div>
<div style="font-family: monospace, courier new, courier">Rex Zietsman</div>
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