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</o:shapelayout></xml><![endif]--></head><body lang=NL-BE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hi Kshanika Gooneesekera,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>the biogas-value of food waste depends on the fat-, protein and carbo hydrate – content of this substrate and his dry matter content.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The average we experience here in Belgium with food waste of 25% DM is:<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><img width=690 height=221 id="Afbeelding_x0020_1" src="cid:image003.png@01CBDB71.71BFE560"><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>So, max. about 170 MJ per day with the above amount of food waste at 25% DM.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>K rgds<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Johan Carels<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.jcarels.be">www.jcarels.be</a><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=NL style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>Van:</span></b><span lang=NL style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> digestion-bounces@lists.bioenergylists.org [mailto:digestion-bounces@lists.bioenergylists.org] <b>Namens </b>Kshanika Goonesekera<br><b>Verzonden:</b> vrijdag 4 maart 2011 4:51<br><b>Aan:</b> For Discussion of Anaerobic Digestion<br><b>Onderwerp:</b> Re: [Digestion] energy calculations<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>Hi all, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>I’ve got a proposal for a biogas plant at our textile factory in Sri Lanka. I need to verify the energy per day to assess the feasibility of this project.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";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. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>My question is will this plant supply enough gas to cover the present LPG consumption?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 width=459 style='width:275.6pt;border-collapse:collapse'><tr style='height:15.75pt'><td width=366 nowrap colspan=2 valign=bottom style='width:219.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Present LPG consumption in the kitchen</span></u><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>:<u><o:p></o:p></u></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> cylinders per day<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-family:"Calibri","sans-serif"'>3<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>cylinders per month<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-family:"Calibri","sans-serif"'>60<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Gas weight per cylinder <o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-family:"Calibri","sans-serif"'>37.5<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>kg<o:p></o:p></span></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Energy requirement per day <o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal align=right style='text-align:right'><b><span style='font-family:"Calibri","sans-serif"'>4,950<o:p></o:p></span></b></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><b><span style='font-family:"Calibri","sans-serif"'>MJ/kg<o:p></o:p></span></b></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>food waste<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-family:"Calibri","sans-serif"'>450<o:p></o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'>kg/day<o:p></o:p></span></p></td></tr><tr style='height:15.75pt'><td width=274 nowrap valign=bottom style='width:164.2pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.6pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal align=right style='text-align:right'><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td><td width=93 nowrap valign=bottom style='width:55.8pt;padding:0cm 5.4pt 0cm 5.4pt;height:15.75pt'><p class=MsoNormal><span style='font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p></td></tr></table><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";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>13,500MJ/day</b> (calorific value of CH4 taken as 50.09MJ/m3)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>However, calculating the energy obtained using the equation below and taking 15% of the food waste as Carbon content</span><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>, <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>Coe/Co = 0.014T + 0.28<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>Gives the energy per day as <b>3,763MJ/day</b><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>Which of these values am I to trust? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>Thanks and regards<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>Kshanika Goonesekera<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:navy'>Sri Lanka<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:"Arial","sans-serif";color:navy'><o:p> </o:p></span></p></div></body></html>