[Digestion] Sizing a flexible balloon digester

Vianney Tumwesige trustvianney at gmail.com
Mon Apr 30 13:54:50 CDT 2012


Guess all is well.

*Sizing a biogas unit*

The size of the digester, i.e. the digester volume *Vd*, is determined on
the basis of the chosen retention time *RT* and the daily substrate input
quantity *Sd*. For a simple digester design, the retention time should
amount to at least 40 days


   - RT = retention time = 40 days
   - Sd = daily substrate quantity = manure plus water
   - Volume of digester, Vd = Sd × RT

The ratio *Vd *÷ *Vg *(digester volume ÷ gasholder volume) is a major
factor when designing a biogas digester. For a typical agricultural biogas
plant, the *Vd/Vg*-ratio amounts to somewhere between 3:1 and 10:1, with
5:1 - 6:1 occurring most frequently.


   -  Volume of gas (Vg) = 1/3Vd
   - Total volume required = Vd + Vg

*
I need to estimate the volume of the flexible balloon digester (using the
above equations) which would be installed in different households. The
 daily feedstock, volume of biogas storage and retention time being the
determinant factors. Retention time was however fixed at 40 days.

I will be glad to get guided.

Thanks in advance
.

Best regards,
*

-- 
Vianney Tumwesige
Director - Green Heat (U) Ltd  [image: Picture]
P.O. Box 10235
Kampala-Uganda
256 (0) 71 237 9889

"The more people are self sufficient in cooking fuel, the more personal and
financial freedom they have." - Emma Casson


 <http://trustvianney.wordpress.com/>
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