[Digestion] AD for cow manure

[Michael Köttner]

Hi Rex,

Greetings to South Africa, where I lived and worked for three years on an 
organic pioneering farm in the Cape in the late 80ies. 

What you need is a simple lagoon digester. The stirring and haeting is done by 
a punp and a heat exchanger. Here in germany and Brasil the first efficient 
lagoon digesters are built. We are helping out in South America at the moment, 
but would like to come to S.A. too if opportunity arrises. 

I would suggest one of our courses or study tours to get you in the picture. 
Please look at our home page www.biogas-zentrum.de. There is also an English 
button. 

Best regards

Michael Köttner


---


IBBK Fachgruppe Biogas GmbH
(International Biogas and Bioenergy Centre of Compentence)
Am Feuersee 6
74592 Kirchberg/Jagst
Germany

Fon: +49 (0)7954 926203
Fax: +49 (0)7954 926204

www.biogas-zentrum.de/ibbk/

Geschäftsführer: Dipl. Agr.biol. Michael Köttner
Steuernummer: 57073/21766
UmSt.ID: DE213140113



Am Samstag, 4. Juni 2011, 08:42:52 schrieb Rex Zietsman:
> Hi all,
> 
> I am going to do something I swore I would never do. Unfortunately, I just
> don't have the time and know that the folks on this list know far more than
> me and can point me in the right direction.
> I live in a rural area where we are subject to occasional power cuts (power
> lines down mostly due to weather) but, more importantly, our power bills
> are rocketing as South Africa races to catch up to the rest of the world
> in terms of cost of power. Historically we had paid off coal fired power
> plants that gave us the lowest cost of power in the world. Anyway, now
> that power costs are rising, own generation is becoming an economic
> necessity.
> 
> In my area we have a large number of dairy farms milking >500 cows. These
> are sizeable operations and the manure they produce is worth pursuing.
> Typically they all have slurry dams and they spread their manure from time
> to time (much to our temporary dismay while the odour kills us!). The
> question is: what is an economical way of producing gas? Bear in mind,
> efficiency is not an issue in this case. What we are talking about is
> getting gas that can be cleaned up and fed into motors to produce power. I
> am looking at using 3 litre petrol engines that will push out about 50kW
> tops. So, we are not looking for anything fancy. A plugflow system would
> make most sense as they can pump it into the one end while the processed
> material leaves the other. Heating suggestions? What about using the engine
> exhaust to heat water and circulate that around the reactor or use it to
> preheat the incoming feed? Here I was simply thinking of a double tank with
> hot water in the outer tank... any other suggestions?
> 
> The other thing these farmers use a lot of is sileage (chopped maize that
> is stored and allowed to ferment). Has anyone had experience adding some
> of this to the AD?
> 
> Looking forward to hearing from you all!
> Rex
> 
> 
> 
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