[Digestion] what is igh calorie for a biogas digester?

[Paul Harris]

G'day Arnand et al,

Since Biological Oxygen Demand (BOD) is often used as a measure of 
digestibility (carbohydrates and water? (H2O) can provide oxygen) oxygen 
content is probably not a crucial factor in digestion. Volatile Solids 
(VS) content is related to BOD (but quicker and easier to assess).

Biomethane potential is probably the best guide (as some VS may not be 
digestible or there may be inhibitory substances.

Hope this is some help,
Happy digesting,

HOOROO
Mr Paul Harris

On 20/04/2015 12:46 PM, Anand Karve wrote:
> Dear List
> calories are a measure of energy released in the process of oxidation.
> Dung has practically no nutritional value for the methanogens. Human
> food, on the other hand yields large quantity of biogas. So I used to
> advocate the use of high calorie food to be used as feedstock till I
> realised that the feedstock is not oxidised at all in a biogas plant.
> In fact, the biogas producing organisms reduce the feedstock by
> extracting oxygen from it. So how does one assess the quality of
> feedstock that is fed into the biogas plant. Digestibility is one
> criterion. Can the oxygen content of the feedstock be a crucial
> factor?
> Yours
> A.D.Karve
> ***
> Dr. A.D. Karve
>
> Chairman, Samuchit Enviro Tech Pvt Ltd (www.samuchit.com)
>
> Trustee & Founder President, Appropriate Rural Technology Institute (ARTI)
>
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