[Digestion] feedbag-type digester slopes

[Warren Weisman]

Makes perfect sense. No worries about your English,
Jaime. Your English is much better than my Spanish. I
will be lost when we get to Mexico. 

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

> 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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