<div>Dear Deepak,</div>
<div>If I have understood you correctly, what you are planning to do is to have a biphasic digestion system, in which the first tank would be for stirring the material with water in an open tank, exposed to air, and to allow the overflow from this tank to enter into the anaerobic digester. The quantity of biogas generated by anaerobic digestion is directly proportional to the digestibility of the feedstock. Human food consisting of sugar, starch, protein and fats has high digestibility, so that 1 kg (dry weight) of any of the above substances would yield about 1 kg biogas, if it is introduced directly into an anaerobic digester. In the case of green leaves, the midribs and veins, consisting of lignin, cannot be digested by the methanogens, so that the digestible matter constitutes only about half the dry weight. You would therefore have to introduce about 2 kg (dry weight) of leaves into the anaerobic digester to produce 1 kg biogas. In comparison to the anaerobic microbes, the aerobic micro-organisms are much more efficient in breaking down biomass. Therefore, stirring the biomass with water in an open tank would oxidise the easy-to-digest material into carbon dioxide and water. If you spent too much time on stirring, only the difficult-to-digest material would enter the anaerobic digester and your biogas yield would be rather low. My advice would be to introduce food waste and kitchen waste directly into the anaerobic digester and subject only the fecal matter to mixing under aerobic conditions. </div>
<div>Yours</div>
<div>A.D.Karve</div>
<div><br><br> </div>
<div class="gmail_quote">On Sun, May 20, 2012 at 7:59 PM, Deepak D. G. <span dir="ltr"><<a href="mailto:ghindwani@gmail.com" target="_blank">ghindwani@gmail.com</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT:#ccc 1px solid;MARGIN:0px 0px 0px 0.8ex;PADDING-LEFT:1ex" class="gmail_quote">Dear expert,<br><br>I am planning to build Floating AD (about 4 to 6 m3) using three inputs: Goat Waste, Human Waste and Kitchen Waste.<br>
<br>As far as I understand, because of the human toilet system - it makes the human waste has too much water. While, I think goat waste is very dry (little water) and kitchen waste is very easy to premix with water.<br><br>
With that understanding, can I just combine all wastes into one chamber and feed them directly to the digester.?<br><br>I have this idea is to combine all the waste into one small water tank (may be 100 liter or smaller ) and the overflow is fed into a brick well with floating plastic gas collector. Do you have any suggestion how to make the handling of the waste easier with minimum human interaction?<br>
<br>Does any body have done the same thing or similiar?<br><br>Regards,<br>Deepak<br><br>______________________________<u></u>_________________<br>Digestion mailing list<br><br>to Send a Message to the list, use the email address<br>
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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/<u></u>biogas/</a><br>and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
<br></blockquote></div><br><br clear="all"><br>-- <br>***<br>Dr. A.D. Karve<br>Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)<br><br><br>