<div dir="auto">Glad to hear from you and also glad to know that the list is still surviving. I am still working on food waste and kitchen waste as feedstock. One of the drawbacks of this feedstock was that one could load the digester with only a small quantity of feedstock at a time. But with our new design, we have overcome this problem. Now we load all the feedstock into a predigester. Because of overloading, the pH of the material in the predigester becomes acidic, but the new design is such, that the digester draws in only so much of the acid, as can be converted by it into biogas.<div dir="auto">Adding bichar certainly works, but only temporarily. The digester filled with biochar produced three times as much biogas as was possible without the biochar, but only for three months,. After 3 months we had to open the digester and load it again with fresh biochar. This indicated that food waste does not have enough minerals and that the ash in the biochar served the bacteria as a source of minerals. One can as well add chemical fertilizers to the digester to achieve the same results.</div><div dir="auto">Yours</div><div dir="auto">A.D.Karve</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sun 7 Nov, 2021, 3:31 AM , <<a href="mailto:tmiles@trmiles.com">tmiles@trmiles.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="EN-US" link="blue" vlink="purple" style="word-wrap:break-word"><div class="m_4540393590755396650WordSection1"><p class="MsoNormal">Thanks! A lot has happened in anaerobic digestion since the list was last active last Spring. <u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><ol style="margin-top:0in" start="1" type="1"><li class="m_4540393590755396650MsoListParagraph" style="margin-left:0in">RNG. While we only have a small number of commercial digesters in the US compared with Europe there is a lot of excitement about Renewable Natural Gas, especially from the American Biogas Council. They report that there are 161 digesters that are now selling RNG and that there is a potential for something like 2000. The contracts for RNG appear attractive but it is not yet clear what the net benefit is to the owner after complex transaction fees are subtracted. <a href="https://americanbiogascouncil.org/" target="_blank" rel="noreferrer">https://americanbiogascouncil.org/</a><u></u><u></u></li></ol><p class="MsoNormal"><u></u> <u></u></p><ol style="margin-top:0in" start="2" type="1"><li class="m_4540393590755396650MsoListParagraph" style="margin-left:0in">Food wastes are another emerging feedstock for AD in the US, almost as a pre-treatment for composting the digestate. <u></u><u></u></li></ol><p class="MsoNormal"><u></u> <u></u></p><ol style="margin-top:0in" start="3" type="1"><li class="m_4540393590755396650MsoListParagraph" style="margin-left:0in">Research has demonstrated the value of adding biochar to AD feedstock with a variety of benefits but we don’t see commercial use of biochar yet in AD either as a digester additive or as an additive to digestate prior to composting. <u></u><u></u></li></ol><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Tom <u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b>From:</b> Bruno M. <<a href="mailto:brunom1@telenet.be" target="_blank" rel="noreferrer">brunom1@telenet.be</a>> <br><b>Sent:</b> Saturday, November 06, 2021 2:31 PM<br><b>To:</b> For Discussion of Anaerobic Digestion <<a href="mailto:digestion@lists.bioenergylists.org" target="_blank" rel="noreferrer">digestion@lists.bioenergylists.org</a>>; <a href="mailto:tmiles@trmiles.com" target="_blank" rel="noreferrer">tmiles@trmiles.com</a><br><b>Subject:</b> Re: [Digestion] Test Message<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">yep, works perfect Tom.<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">================================<u></u><u></u></p></div><div><p class="MsoNormal">Op 6-11-2021 om 21:02 schreef <a href="mailto:tmiles@trmiles.com" target="_blank" rel="noreferrer">tmiles@trmiles.com</a>:<u></u><u></u></p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><p class="MsoNormal">This is a test to see if the list is still available<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Tom Miles<u></u><u></u></p><p class="MsoNormal">Digestion list Owner<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal"><br><br><u></u><u></u></p><pre>_______________________________________________<u></u><u></u></pre><pre>Digestion mailing list<u></u><u></u></pre><pre><u></u> <u></u></pre></blockquote><p class="MsoNormal"><u></u> <u></u></p></div></div>_______________________________________________<br>
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