[Digestion] feedbag-type digester slopes

[Warren Weisman]

So, do we manually push/pull the effluent through the
digesters to get it from the inlet to the outlet?
Warren


--- Jaime Marti Herrero <tallerbiogas at hotmail.com>
wrote:

> Hi warren
> The slope is recomend to be 0. you can have as much
> 5-10% slope.
> The
> manure will be mixed wth water on 1:3 (if it is vcow
> manure, 1:4 if
> pig) so it is really flluid the mud inside the
> biodigester.
> if you have 10 m biodigester, yo have to know the
> diameter or radio of the system. You need to know
> the volume.
> once
> you know the volume, 1/4 of it will be for the
> biogas bell on the upper
> part of the biodigester, so ypou will have 3/4 of
> the total volumen for
> liquid part.
> This liquid volume you have to divide between the
> load
> of  manure plus water that you will put insedie the
> biodigester every
> day. So if you do this, you will get the retention
> time. If you add
> more load manure:water the retention time will
> reduce.
> You have to get a longitude:diameter rate of 1:5 -
> 1:10, and the best rate is 1:7.5.
> 
> The retention time (RT) depends on the ambient
> temperature of the place where the biodigester is
> gonna work. I recomend:
> Min ambient temp.        Mean ambient Temt       
> Retention time
>    -10ºC                                            
>    4-12ºC                        75 days
>    1ºC                                              
>    12-20ºC                    37 days
>     10ºC                                            
>    20-30ºC                    25 days
> 
> So
> once you know the RT, you need too know the manure
> that you want to
> introduce in the biodigester every day (every kg of
> cow manure will
> produce 35 liters of biogas). With the amount of
> manure yo plus the
> water need to mix it (1:3). this will bee your daily
> load. you have to
> multiplay the daily load with the RT, and you get
> the liquid volume of
> the biodigester.
> Know you have to add the biogas bell: this is 1/3
> of the liquid volume(the total volume is 1/4 of
> biogas bell and 3/4 of
> liquid volume) , so you will get the total volume of
> the biodigester.
> Now you know the  total volume, yo have to find the
> best relation between the diameter and longitude to
> get 1:7.5 rate.
> 
> You can send your design and i will help you if you
> want.
> Kind regards
> Keep in contact
> jaime
> 
> 
> 
> > Date: Sun, 25 May 2008 15:33:50 -0700
> > From: weiswar at yahoo.com
> > To: digestion at listserv.repp.org
> > Subject: [Digestion] feedbag-type digester slopes
> > 
> > 
> > Hey all, 
> > 
> > With feedbag-type digesters like the ones in the
> video
> > from Bolivia what slope is the trench cut at in
> order
> > to move the effluent through? Obviously we can
> control
> > the retention time with the angle, does anyone
> know
> > how long of a retention time would be for a 10
> meter
> > long feedbag digester? 
> > 
> > Thanks Warren 
> > 
> > 
> >       
> > 
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