Backyard Aquaponics
A place to discuss aquaponics

Hi all,

i have a few docs relating to bio-gas production from very old research. not until i stumbled across a wiki article did i realise how many developing nations were using biogas!!!

the resultant co2 is 20x less of a greenhouse gas than the methane in the bio gas!

india has 2+ MILLION household biogas setups

http://en.wikipedia.org/wiki/Landfill_gas

and did you know that victoria has 9 landfill gas power "stations" (one is around the corner from me) totalling 48MW

i feel better about going to the dunny now, Werribee creates 3.76MW from our crap

No shit eh!

lol

Lots of shit, LOL!

I have a colleague who is building a system on his fish farm in a remote rural area which works as follows;

Pigs and goats are kept in a spacious, cement-floored pen for 18 hours of their day (they graze in a field for the remainder)
The pen has drains on all four sides of the cement slab.
While the animals are out, workers hose down the pen and the water and poop go down the drains into a bio-digester.
Methane is collected from the bio-digeter using a simple water collection process and piped to the workers cottages where it is used for heating and cooking.
Water overflows into an algae pond.
This algae is harvested weekly and mixed into the fish food.
The algae pond overflows into a Tilapia pond.
The Tilapia pond overflows onto aquaponic grow beds.
Water flows to a sump and is then pumped back to the top of the hill and used to hose down the animal pens.
And it all starts over again !!

Thats neat.

I have a report from a guy i met who was building some biodigesters in Tanzania.
I'll get back to it and post if you're interested in the building plans.

This fella, Jean Pain (http://journeytoforever.org/biofuel_lib ... _pain.html), built a HUGE compost pile from shredded wood. The composting heat provides hot water and keeps the methan digester in the center of the pile hot, producing enough methan to turn a 100W generator.



He is currently my hero.

See compost water heater here:
http://www.backyardaquaponics.com/forum ... at+compost

oh, you posted on that thread... no doubt you already knew about it...

hehe yeah thanks kudapucat, I started that thread. You should see the huge pile of big brown paper yard bags filled with leaves I have in my backyard to build a HUGE compost pile/water heater. I'm going to try and make biogas with it as well.

Here is everything I have collected about methane production. Its a 5.75 MB PDF file. Its a good read. In 2000 it was the best info I could find. Perhaps there better info now, still rotting crap never really changes.

Download methane.PDF

I think one of those continuous tubes with baffles in it would work better than any tank. A piston moves the fluid back and forth, the baffles stir the mixture, when more fluid is injected fluid is ejected. Simple cheap and a bit more like a real gut. Just make it long enough, that for the amount you can feed it, that all the waste is processed completely. Much much better than a tank. No crust would form as long as you can keep the $#!T flowing; that is adding more every day.

I have one like that goes off about every hr i think its funny the misses doesent