[Digestion] Large scale Biodigestion plants - Dry vs Wet

[Murali Krishna]

Good day Mr. Paul,

Yes, we can hitherto adopt terminology "solid fermenter" and "wet
fermenter" and "solid digestion".  You are absolutely right that without
moisture no fermentation process takes place.

Krishna

On Tue, Oct 30, 2012 at 11:52 AM, Paul Harris
<paul.harris at adelaide.edu.au>wrote:

>  G'day All,
>
> May I suggest we adopt the terms "solid digestion" (for substrates that
> won't flow, moved by front end loader) and "liquid digestion" for the more
> conventional pumpable substrates - all anaerobic digestion needs moisture,
> only the amount varies! There is no such thing as "dry" digestion as drying
> is a method of stopping degradation. If we can't get reasonable terminology
> ourselves how is the general public going to understand what we are up to?
>
> Happy digesting,
> HOOROO
>
> Mr Paul Harris BEng (Ag) (Melbourne)
> Visitor at The University of Adelaide
>
> On 30/10/2012 6:32 AM, Terrence Sauve wrote:
>
> Hi Robin,
> The dry vs wet debate may re-ignite!
>
> What I would assert for your planned AD system is a fairly wet mixture
> from the start. Generally cheaper to keep it the way it comes out of the
> digestate pipe. Dry would be nice, but who would come to build your plant
> and at what cost?
>
> If you could find resellers of Kompogaz, BECON or Dranco, it would be good
> for you. I'm only aware of CEM Engineering that did some AD work in S.
> Africa, but its a liquid system.
>
> Have you considered a solid-liquid digestate seperator combined with UF
> and flocculation system?
> Give us more info on size or scale and amounts of feedstock coming in. If
> its still the case for grid connection deadlines in Germany, engineering
> firms may be looking for work past that deadline and most of them have an
> internationnal portfolio. Foremost, they are always interested to work in
> countries where the waste stream is full somewhat free organic waste to
> digest - why send to a landfill!
>
> Good luck
> Terrence
>
>
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