<HTML><HEAD><TITLE>Re: [Digestion] Sugar feedstock</TITLE>
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<DIV>Hi David</DIV>
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<DIV>Thank you for the quick response and the info.</DIV>
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<DIV>Regards</DIV>
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<DIV>TD</DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=davidf@kingdombio.com
href="mailto:davidf@kingdombio.com">David Fulford</A> </DIV>
<DIV><B>Sent:</B> Wednesday, February 06, 2013 10:06 AM</DIV>
<DIV><B>To:</B> <A title=td@tiscali.co.za href="mailto:td@tiscali.co.za">Tony
Dovey</A> </DIV>
<DIV><B>Cc:</B> <A title=digestion@lists.bioenergylists.org
href="mailto:digestion@lists.bioenergylists.org">digestion@lists.bioenergylists.org</A>
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<DIV><B>Subject:</B> Re: [Digestion] Sugar feedstock</DIV></DIV></DIV>
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style="FONT-FAMILY: 'Verdana'; FONT-SIZE: 9pt">Hello Tony,<BR><BR>When I was
running a laboratory digester at Reading University, I wanted to make it as
automatic as possible. I used dissolved sugar as a "base" feed, as it could be
fed as a solution through a valve controlled by a timer. I did add small amounts
of fertiliser to make sure the C:N ratio was correct - between 10:1 and 30:1. (I
used ammonium sulphate, a BIG mistake, as the digester generated hydrogen
sulphide; ammonium nitrate is better). At low rates of feed the digester ran
very well. <BR><BR>A student also ran some tests on molasses as a feed material
for a digester. When we tried to increase the loading rate, the digester went
sour: too many fatty acids were generated. Acid generation works much faster
than methane generation, so the feed rate must match the methane rate. Sugar
digests fairly rapidly, as it is readily available to the microbes. Sugar is
therefore a good additive for other feed material. <BR><BR>So, a biogas system
runs very well on sugar, but nitrogen needs to be added and the feed rate needs
to be limited. There are models for designing the right size of plant (see
</SPAN><A style="FONT-FAMILY: 'Verdana'; FONT-SIZE: 9pt"
href="http://biogas.wikispaces.com/">http://biogas.wikispaces.com/</A><SPAN
style="FONT-FAMILY: 'Verdana'; FONT-SIZE: 9pt"> which has links to Paul Harris's
model). Increase the sugar feed rate slowly until the gas production rate does
not increase at the same rate as the feed rate, then reduce the feed rate
slightly and keep it at that level. <BR><BR><SPAN
style="COLOR: #31652c; FONT-SIZE: 8pt"><I>-- <BR>Best
regards,<BR>David<BR> </I></SPAN></SPAN><A style="FONT-FAMILY: 'verdana'"
href="mailto:davidf@kingdombio.com">mailto:davidf@kingdombio.com</A><BR><BR><SPAN
style="FONT-FAMILY: 'verdana'; COLOR: #31652c"><I>Wednesday, February 6, 2013,
6:35:26 AM, you wrote:<BR><BR></I></SPAN>
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<TD width=710><SPAN style="FONT-FAMILY: 'arial'; FONT-SIZE: 10pt">Hi
there.<BR> <BR>I have read with keen interest about the Indian
sugar/starch digester being punted by ARTI.<BR> <BR>We have access to
between 200 –300kg sugar sweepings a month and am very keen to build a
floating drum type digester.<BR> <BR>Does anyone have any practical
experience of using stock standard sugar as a
feedstock?<BR> <BR>Regards<BR> <BR>TD<BR> <BR> <BR><BR><SPAN
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********************************************************************<BR>Dr David
Fulford CEnv MEI, 15, Brandon Ave, Woodley, Reading RG5 4PU<BR></SPAN><A
style="FONT-FAMILY: 'verdana'; FONT-SIZE: 9pt"
href="mailto:d.j.fulford@btinternet.com">d.j.fulford@btinternet.com</A><SPAN
style="FONT-FAMILY: 'Verdana'; FONT-SIZE: 9pt">, Tel: +44(0)118 326 9779 Mob:
+44(0)7746 806401<BR>Kingdom Bioenergy Ltd, </SPAN><A
style="FONT-FAMILY: 'verdana'; FONT-SIZE: 9pt"
href="http://www.kingdombio.com">www.kingdombio.com</A><SPAN
style="FONT-FAMILY: 'Verdana'; FONT-SIZE: 9pt">, </SPAN><A
style="FONT-FAMILY: 'verdana'; FONT-SIZE: 9pt"
href="mailto:davidf@kindombio.com">davidf@kindombio.com</A><BR><SPAN
style="FONT-FAMILY: 'Verdana'; FONT-SIZE: 9pt">
Skype Identity: djfulford </SPAN></DIV></DIV></DIV></BODY><br />--
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