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<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Hi all,
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Thank you Mr. Karve and Johan Carels for the valuable information. The contractor assures me that by reducing the input of water the
CH4 content can be increased, and the 3 digesters will maximize biogas output further due to consecutive digestion. Is this possible?<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Has anyone any experience with the 1:1, food(dry matter):biogas output?
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Regards
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Kshanika
<o:p></o:p></span></font></p>
<p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><b><font size="2" face="Tahoma"><span style="font-size:10.0pt;
font-family:Tahoma;font-weight:bold">From:</span></font></b><font size="2" face="Tahoma"><span style="font-size:10.0pt;font-family:Tahoma"> digestion-bounces@lists.bioenergylists.org
[mailto:digestion-bounces@lists.bioenergylists.org] <b><span style="font-weight:
bold">On Behalf Of
</span></b>Anand Karve<br>
<b><span style="font-weight:bold">Sent:</span></b> Sunday, March 06, 2011 8:30 AM<br>
<b><span style="font-weight:bold">To:</span></b> For Discussion of Anaerobic Digestion<br>
<b><span style="font-weight:bold">Subject:</span></b> Re: [Digestion] energy calculations</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">Dear Mr. Goonesekera,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt"> You have to assess the water content in the food waste to get a correct estimate. Starch and sugar produce almost twice as much biogas as green vegetable waste. So,
the composition of the food waste is also important. The rule of thumb followed by us is that a kg dry weight of human food waste would produce about 600 to 700 litres of biogas and that it would replace about 200 to 250 g LPG. Assuming your daily food waste
to be 450 kg to have a dry weight of 225 kg and that it contains some portion of leafy and lignocellulosic vegetable waste, one would get daily about 225 X 200 = 45,000 g or 45 kg equivalent of LPG. <o:p></o:p></span></font></p>
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<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">Yours<o:p></o:p></span></font></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><font size="3" face="Times New Roman"><span style="font-size:12.0pt">A.D.Karve .<o:p></o:p></span></font></p>
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<div>
<p class="MsoNormal"><font size="3" face="Times New Roman"><span style="font-size:
12.0pt">On Fri, Mar 4, 2011 at 11:51 AM, Kshanika Goonesekera <<a href="mailto:KshanikaG@masholdings.com">KshanikaG@masholdings.com</a>> wrote:<o:p></o:p></span></font></p>
<div vlink="purple" link="blue">
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">Hi all,
</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">I’ve got a proposal for a biogas plant at our textile factory in
<st1:country-region w:st="on"><st1:place w:st="on">Sri Lanka</st1:place></st1:country-region>. I need to verify the energy per day to assess the feasibility of this project.</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">The contractors propose a 90m3 plant (comprising of 3 tanks - 60m3, 20m3
and 10m3) for a daily input of 450kg of food waste from the canteen. </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">My question is will this plant supply enough gas to cover the present
LPG consumption?</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:navy"> </span></font><o:p></o:p></p>
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padding:0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><u><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri">Present LPG consumption in the kitchen</span></font></u><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri">:</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
</tr>
<tr height="21" style="height:15.75pt;MIN-HEIGHT: 15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri"> cylinders per day</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" align="right" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right">
<font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">3</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
</tr>
<tr height="21" style="height:15.75pt;MIN-HEIGHT: 15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri">cylinders per month</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" align="right" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right">
<font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">60</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
</tr>
<tr height="21" style="height:15.75pt;MIN-HEIGHT: 15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri">Gas weight per cylinder
</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" align="right" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right">
<font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">37.5</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">kg</span></font><o:p></o:p></p>
</td>
</tr>
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<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri">Energy requirement per day
</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" align="right" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right">
<b><font size="3" face="Calibri"><span style="font-size:
12.0pt;font-family:Calibri;font-weight:bold">4,950</span></font></b><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri;
font-weight:bold">MJ/kg</span></font></b><o:p></o:p></p>
</td>
</tr>
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<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
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<tr height="21" style="height:15.75pt;MIN-HEIGHT: 15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">food waste</span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" align="right" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right">
<font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri">450</span></font><o:p></o:p></p>
</td>
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height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri">kg/day</span></font><o:p></o:p></p>
</td>
</tr>
<tr height="21" style="height:15.75pt;MIN-HEIGHT: 15.75pt">
<td width="219" nowrap="" height="21" valign="bottom" style="width:164.2pt;padding:
0in 5.4pt 0in 5.4pt;height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.6pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" align="right" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;text-align:right">
<font size="3" face="Calibri"><span style="font-size:12.0pt;
font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
<td width="74" nowrap="" height="21" valign="bottom" style="width:55.8pt;padding:0in 5.4pt 0in 5.4pt;
height:15.75pt;MIN-HEIGHT: 15.75pt">
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="3" face="Calibri"><span style="font-size:12.0pt;font-family:Calibri"> </span></font><o:p></o:p></p>
</td>
</tr>
</tbody>
</table>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">Assuming a food:biogas of 1:1, 450m3 of biogas will be produced per day.
Of which 60% is CH4 hence, energy obtained = <b><span style="font-weight:bold">13,500MJ/day</span></b> (calorific value of CH4 taken as 50.09MJ/m3)</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">However, calculating the energy obtained using the equation below and
taking 15% of the food waste as Carbon content</span></font><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:black">, </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:black">Coe/Co = 0.014T + 0.28</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="black" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:black"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">Gives the energy per day as
<b><span style="font-weight:bold">3,763MJ/day</span></b></span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">Which of these values am I to trust?
</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">Thanks and regards</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;
color:navy">Kshanika Goonesekera</span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><st1:country-region w:st="on"><st1:place w:st="on"><font size="2" color="navy" face="Calibri"><span style="font-size:11.0pt;font-family:Calibri;color:navy">Sri Lanka</span></font></st1:place></st1:country-region><o:p></o:p></p>
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color:black"> </span></font><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font size="2" color="navy" face="Arial"><span style="font-size:10.0pt;font-family:Arial;
color:navy"> </span></font><o:p></o:p></p>
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<br>
for more information about digestion, see<br>
Beginner's Guide to Biogas<br>
<a href="http://www.adelaide.edu.au/biogas/" target="_blank">http://www.adelaide.edu.au/biogas/</a><br>
and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
<br>
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<br clear="all">
<br>
-- <br>
***<br>
Dr. A.D. Karve<br>
President, Appropriate Rural Technology Institute (ARTI)<br>
<br>
*Please change my email address in your records to: <a href="mailto:adkarve@gmail.com">
adkarve@gmail.com</a> *<br>
<br>
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