[Digestion] Digester Selection

[Paul Harris]

G'day Again,

1. In my simple engineers approach "what goes in MUST come out 
(sometime!)" - this means that nearly all the inputs appear in the 
sludge, as only relatively small amounts of carbon, hydrogen and oxygen 
appear in the gas stream (with traces of nitrogen, sulphur etc.), but 
some grit may only be emptied in maintenance periods. You will only get 
H2S with high sulphur feeds (and possibly short retention times) and 
microbes can acclimate to ammonia given time (build up the feed rate 
slowly!) - pH is also important. As poultry do not have methanogens in 
their gut/crop/whatever you will have to start with cow manure or some 
other innoculum and change gradually to poultry manure - less problems 
if you can do co-feed other materials.

2. As mentioned in my other e-mail "high rate" digesters (tend to be 
more complex) require more monitoring (can be automatic, but you do 
still need a human or two!) and operator skill than simpler low rate 
digesters.

3. You would have to watch heavy metals when you spread sludge and make 
sure steroids don't yield "super-bugs". Heavy metals can cause 
inhibition and I am not sure about steroid effects (I was joking about 
superbugs!).

4. Yes, as mentioned above co-digestion may solve (or help with) some of 
the problems.

Hope this helps,
HOOROO

On 19/06/2013 3:12 PM, Prabhu Govindarajan wrote:
>
> Hi
>
>  Thanks for the pointers.The question i had in my mind when i asked 
> this was this
> 1.Does AD design affect the manure produced,H2S Content and ammonia 
> inhibition?
> 2.How does it affect the operational and process maintenance ?
> 3.As broiler manure supposed to have lot of heavy metals and steroids 
> should special care be taken .
> 4.Can some kind of co-digestion solve it ?
>
> Thanks
>
> Prabhu.G
>
>
> On Tue, Jun 18, 2013 at 11:30 PM, 
> <digestion-request at lists.bioenergylists.org 
> <mailto:digestion-request at lists.bioenergylists.org>> wrote:
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>        1. Digester Selection (Prabhu Govindarajan)
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>     ----------------------------------------------------------------------
>
>     Message: 1
>     Date: Tue, 18 Jun 2013 11:28:33 +0530
>     From: Prabhu Govindarajan <prabhu.govvindarajan at gmail.com
>     <mailto:prabhu.govvindarajan at gmail.com>>
>     To: digestion at lists.bioenergylists.org
>     <mailto:digestion at lists.bioenergylists.org>
>     Subject: [Digestion] Digester Selection
>     Message-ID:
>            
>     <CAGQutcAU2zjUdJSr09j=4itsRd6Pe-gxs17Du6m34xzdj5oePQ at mail.gmail.com <mailto:4itsRd6Pe-gxs17Du6m34xzdj5oePQ at mail.gmail.com>>
>     Content-Type: text/plain; charset="iso-8859-1"
>
>     Hi
>        I am from a south Indian State of India, TamilNadu.We want to
>     build a
>     Digester for poultry manure (2-5) tons/week What would be nice
>     approach for
>     the AD
>
>     1.CST  3 Stage Plug Flow  - CST IISC
>     2.Nisarguna - BARC Reactor -
>     http://www.barc.gov.in/akruti-tp/atp_nisar.html
>     3.CSTR
>     4.U Shaped mixed plug flow - Some US Dairy Farms
>
>     Can somebody help us with consultancy as well ?
>
>     Thanks
>
>     Prabhu.G
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