<span style="color:rgb(0,0,153)"><font size="4"><span style="font-family:times new roman,serif">Good day All,<br><br>If ideal conditions are maintained in a biogas digester the biogas yield will increase by 20 to 25% than the conventional digesters. When the percentage of TS of a substrate is less th<font size="4">an </font> 3 to 4%, the tendency is that a fair amount of microorganisms flush out through outlet along with digestate. The growth rate of methanogenesis fermentative bacteria is slow unlike acidogenic bacteria. If a bio media is provided in the digester bacteria<font size="4"> they cl<font size="4">ing on to media and</font></font> develop colonies<font size="4">. As there is optimum load is maintained in the digester,<font size="4"> </font></font>effective fermentation takes place. Hence, the overall efficiency of fermentation and biodegradation impvoes, so is biogas yield.<br>
<br>Depending upon the substrate, the digesters are designed and the design should ensure best ideal conditions, such as temperature, microbial load and pressure. For certain substrates with high SRT/HRT and especiaqlly when the TS percentage is on higher side, you may not require these bio media rings. <br>
<br>If there is a flood, water flows at a faster rate and carrys with it a fairly large amount of branches, and other matter and sometimes even people. When it happens, we disperately look for something to hang on and survive and work again. For tiny microorganims even your one inch flow is also a flood. So you need to ensure sufficient workers to cook the food in the digester. <br>
<br>A good number of bio media chips, rings and tubes (in different shapes) are available on the market. You need to choose the right ones keeping in mind your needs (if at all you need them). To conclude, Yes, if the bio media is rightly selected and placed, it will certainly help in enhancing the overall performance of the digester and yields.<br>
</span></font><br>Krishna.</span><br><br><br><div class="gmail_quote">On T thehu, Nov 1, 2012 at 10:26 PM, David <span dir="ltr"><<a href="mailto:david@h4c.org" target="_blank">david@h4c.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<br>
<br>
Paul,e<div class="im"><br>
<br>
<div>On 11/1/2012 1:32 AM, Paul Muthui
wrote:<br>
</div>
<blockquote type="cite">
<div>Good Day All,</div>
<div><br>
</div>
I read in an article that increasing the surface area inside the
biogas digester (e.g. by introducing vertical structures),
increases the population bacteria population and consequently more
gas production. By what percentage does this increase gas
production? And what's the most effective way to do it?</blockquote>
<br></div>
Methanogens are part of a complex ecology that likes to sustain
itself by forming biofilms on any available surface. However, for
most kinds of digestion-- that is, at any percentage of solids that
one might "choose," rather than having it <i>imposed</i> by the
high water content of the substrate-- there is plenty of surface for
the biofilms to form.<br>
<br>
Adding surface to the inside of a digester, then, is almost
exclusively done where the dilution of the incoming substrate is
considerable (1%-2% or less). What happens where such substrates are
digested with sufficient HRT is that floating consortia of microbes
develop. These a bit like sponges, and are often referred to as
"flocs".<br>
<br>
You may be able to learn more by searching for [biogas dilute flocs]
and adding any reference to the substrate you have in mind.<span class="HOEnZb"><font color="#888888"><br>
<br>
<br>
<br>
d.<br>
<div>-- <br>
<div style="font:Georgia"><span style="font-size:110%">David
William House<br>
</span>
<div style="padding-left:3em;font-size:80%">"The Complete
Biogas Handbook" <code><a href="http://www.completebiogas.com" target="_blank">www.completebiogas.com</a></code><br>
<i>Vahid Biogas</i>, an alternative energy consultancy <code><a href="http://www.vahidbiogas.com" target="_blank">www.vahidbiogas.com</a><br>
<br>
</code></div>
<code>
<div style="padding-left:2em">"Make no search for water.
But find thirst,<br>
And water from the very ground will burst."
<div style="padding-left:2em;font-size:80%">(Rumi, a
Persian mystic poet, quoted in <i>Delight of Hearts</i>,
p. 77) <br>
<br>
<a href="http://bahai.us/" target="_blank">http://bahai.us/</a></div>
</div>
</code></div>
</div>
</font></span></div>
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for more information about digestion, see<br>
Beginner's Guide to Biogas<br>
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and the Biogas Wiki <a href="http://biogas.wikispaces.com/" target="_blank">http://biogas.wikispaces.com/</a><br>
<br>
<br></blockquote></div><br><br clear="all"><br>-- <br><span style="color:rgb(0,0,102);font-family:comic sans ms,sans-serif">Regards.<br><br>Murali Krishna<br>Chairman<br>Hyderabad, Andhra Pradesh, India.</span><br style="color:rgb(0,0,102);font-family:comic sans ms,sans-serif">
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</span></b><h1 style="color:rgb(0,204,204);font-weight:normal"><b><font style="font-family:comic sans ms,sans-serif;color:rgb(255,0,0)">Never put water down the drain when there may be another use for it</font></b><br></h1>
<h1 style="color:rgb(255,0,0);font-weight:normal"><font><b>Save the Environment</b></font></h1>
<h1 style="font-family:comic sans ms,sans-serif;color:rgb(153,0,0)"><br></h1></div><br></div></div><b><br></b><br>