Biogas from Vegetarian Food Waste – UF BioEnergy Summer School 07
June 23, 2010 by admin
Filed under Gardening Videos
The 2007 Bioenergy Summer Interns conducted a waste audit at the University of Floirda. They collected the biodegradable plates, cups, and forks as well as the thrown-away food from the ‘Krishna Lunch’ served at the University of Florida to study the suitability of the plates for composting and the food scraps for anaerobic digestion into biogas. This video describes the anaerobic digestion of the waste. Bioenergy School Website: biogas.ifas.ufl.edu UF Biogas Website: biogas.ifas.ufl.edu
Stupid
Hi, I have installed many large and small scale food waste based biogas plants in India. I would like to help you guys in designing a much more efficient, simpler and effective biogas plant. Please contact me on sumedh@srel.in
@FutureNews2point0 I was wondering why everyone gave you a hard time until I found your initial comment. dick.
@FutureNews2point0
How can anyone be so stupid with only 1 head!!!!
@FutureNews2point0 Well, Ive been a soldier, a trawlerman, trucker and I can also swear in half a dozen different languages, but simply CAN NOT express adequately how THICK, DUMB AND STUPID you are.
There are cities powered by methane!!!!!
I will refrain from swearing.
Then again, as John Wayne said, “The hell I will”
DUMB CUNT!
Hi
Was it a better idea to turn the food waste into methane or mulch? How did it work with the plates cups and forks?
Thanks
@BadassCeino I didn’t make the dog doo doo comment but I have 5 dogs and my shovel is very busy. I think most of the methane is made in the dog. You could get lots of dog doo doo from the dog park every day.
will someone answer my question please! the water displacer is it closed pressurized or do you have a spring valve holding the water inside the middle tank?
how do you measure the displacement in detail please. back prssure holding the water above the last tank or a spring valve of some sort?
@FutureNews2point0 thats when we fight to the death for our freedom
@FutureNews2point0
Yeah! but dogs dont shit that much, you gotta have a lot of dogs for that.
What are the sizes of your barrels (the non 55 gallon ones) and where do you get them? Is it just a 40 gallon barrel in a 55? Thanks for your help; we are all learning together.
Thanks so much for the reply! We will be building water displacement systems in Alaska over the next few weeks because we have to have a well insulated digestor. We are trying to decide, however, if we can find the materials to build telescoping (floating barrel) gas collection systems — in Egypt we built one, but it is easy to find 1000 liter and 750 liter water tanks for only about 60 dollars each. In Alaska this will be tough. What are you using, a 55 gallon drum with a smaller drum in it?
Is it any more dangerous than a can of gas in a garage?
We had to manually replace the water. We have since replaced the gas collector with a floating barrel design.
Doggie doo doo can certainly be used in an anaerobic digester to produce biogas.
Methane is flamable and explosive. I’m sure it will soon be a Federal offense to build one of these. It will be considered a “threat to national security”.
Any sugars(pressant in most food)introduced into the fermeting gloop will cause carbon dioxide build up in the head space of the first tank as long as there is some other resistance to hold it back. Carbon Dioxide needs nearly no resistance to build up its own PSI like your water pressure down the line will. It is going to build up CO2 right there in the first tank more than the methane can as methane needs a lot more PSI where CO2 needs little. So maybe try taking the methane away before PSI?
Watch your pressures as this I guess may halt gas leaving the first chamber because they are all connected.
Very inspirational you guys! Quick and maybe stupid question (since I currently use a telescoping drum digester but would like to adopt your model): Once you’ve displaced the water, given that it is now in the lower tank, how do you get it back into the gas holding tank? Does burning the gas itself create enough negative pressure in the gas holding tank to siphon it back in from the measuring tank, or are you manually replacing it? Sorry to sound so obtuse!
That is a good idea. Many digesters use heat from the biogas to amp up their gas production. We wanted to keep the design simple though, and fortunately in Florida we have enough warm weather that the digester stays fairly warm passively.
Does that include doggie doo doo?
How about using the waste gas which you are burning to boil water in a heat exchanger which could be used to heat the digester and speed up the process?
One simple way to pressurize gas we’ve used is to use a floating barrel in water and adding weights to pressurize the gas when its burned.
pressurising it, any information on how to do so? thanks
Actually, we just collected it for one summer as an experiment. The Krishnas, however, are still toying with the idea of composting it themselves.