Rex,<div><br></div><div>Another way to go would be to make a smaller mobile unit that would be transported to the individual sites. A unit that could handle a 1000 cows/pigs, 10000 birds as well as other agricultural concerns, would fit on two flatbeds. This would give a flexibility to demonstrate the success of the process, and share the capital cost, with multiple users in the area. I've been involved in designing multiple mobile batch plants for other industries and this is not as difficult as one might think. <br>
<br><div class="gmail_quote">On Sun, Jan 8, 2012 at 10:51 PM, Paul Harris <span dir="ltr"><<a href="mailto:paul.harris@adelaide.edu.au">paul.harris@adelaide.edu.au</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div lang="EN-AU" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">G’day Rex,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Apparently a lot of the biogas comes from the fines/solutes in
the liquid – I noticed that with piggery effluent the raw effluent was
almost impermeable to water (it would hold puddles for quite a while) but after
treatment the solids were pretty free draining (water disappeared in minutes).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I will also raise my usual point in favour of distributed
systems – why not put smaller (cheaper!) digesters at each farm and if
necessary pipe the biogas to a central generator (depending on distance)? You
will be spending a lot of energy on trucking waste in and then you have to
truck the digestate out from the central facility again. The total capital cost
may be higher, with more units to maintain, but you can start with one or two
and spread the finances out a bit as well as helping local employment (I guess people
will be working on digesters instead of driving trucks!).<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Happy digesting,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">HOOROO<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-- <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1f497d">Mr. Paul Harris, Room 202, Charles Hawker Building <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1f497d">Faculty of Sciences, The University of Adelaide, Waite
Campus, <u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1f497d">PMB 1, Glen Osmond SA 5064<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1f497d">Ph : +61 8 8303
7880 Fax : <a href="tel:%2B61%208%208303%204386" value="+61883034386" target="_blank">+61 8 8303 4386</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1f497d"><a href="mailto:paul.harris@adelaide.edu.au" target="_blank">mailto:paul.harris@adelaide.edu.au</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10.5pt;font-family:Consolas;color:#1f497d"><a href="http://www.adelaide.edu.au/directory/paul.harris" target="_blank">http://www.adelaide.edu.au/directory/paul.harris</a><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">CRICOS Provider Number 00123M<u></u><u></u></span></p>
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<div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a>
[mailto:<a href="mailto:digestion-bounces@lists.bioenergylists.org" target="_blank">digestion-bounces@lists.bioenergylists.org</a>] <b>On Behalf Of </b>REX<br>
<b>Sent:</b> Sunday, 8 January 2012 5:26 PM<br>
<b>To:</b> <a href="mailto:digestion@lists.bioenergylists.org" target="_blank">digestion@lists.bioenergylists.org</a><br>
<b>Subject:</b> [Digestion] 5000 dairy cow AD system<u></u><u></u></span></p>
</div><div><div class="h5">
<p class="MsoNormal"><u></u> <u></u></p>
<div>
<div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Hi
All,<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">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.<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Questions:<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">1.
By leaving the water behind, do we lose most/all/some of the FFA? What impact
would it have on gas production?<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">2.
Can anyone recommend a supplier of technology for this size of plant?<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">3.
5000 cows is an arbitrary amount at this stage - 10 farms of 500 cows each. Is
there a better/more economical size?<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New""> <u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Kind
regards<u></u><u></u></span></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New"">Rex
Zietsman<u></u><u></u></span></p>
</div>
</div>
</div>
</div></div></div>
</div>
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