[Digestion] feedbag-type digester slopes

[Jaime Marti Herrero]

no warren. you get an hydraulic equilibrium....The biodigester is full of mud (manure and water) and its maximum level corresponds with the outlet pipe. The inlet pipe could be longer, o simply more vertical so the mud will scape by the outlet and not by the inlet. If you add more liquid the liquid mud inside de biodigester will overcome by the outlet pipe automatically.  this means that every morning when you load the biodigester, the new load will overcome the overfull line of the biodigeter (marked by the outlet pipe), so you will be introducing new material on one side, and old material will scape by the other side.
Sorry, i feel my english is not good enough.
i send you figure which represent this issue.
Tell me if a have explain it or i just have said something confusing...
Sorry about my english
Keep in contact
jaime




> Date: Mon, 26 May 2008 08:55:19 -0700
> From: weiswar at yahoo.com
> Subject: Re: [Digestion] feedbag-type digester slopes
> To: tallerbiogas at hotmail.com; digestion at listserv.repp.org
> 
> 
> 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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> 
>       

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