hi,
good looking site...
Im interested in a small scale digester for 'food waste' only
kitchen slops etc
i have played with your calculator... great!
this would suggest that some paper or sawdust/leaves would also help..
very small scale to test first 10 gallons or so. a reasonable demo model
1. say there is 1lb per day of food & .2 lb per day sawdust/leaves.
we get a 3 feet of gas per day. with about .5 gallons water added
2. how long would this take to digest... perhaps 60 or 70% of the food converted to gas?
3. how much gas is used in a burner to cook?
mmmmm... thats not very specific...
how many feet of gas does it take to boil a pint of water?
cook a meal?
fry an egg?
but any help would be great
i guess i should be looking up the definition of BTU...
i have a 10 gallon sealed lid container
just looking at a batch feet at first.... so i load it up
i seed it with some poo ive had in a bottle for 2 weeks...i guess!
leave it a few days... and out the tube comes some gas...
how much gas does a camping gas burner use per minute?...on medium flame?
thanks
what to do with the gas?
Moderator:Bob
Hi Ian,
If batch feed, including startup if all goes well, maybe 30 days. But the 2-stage digester in continuous feed mode is designed for about 12 days.
Typical medium/small stovetop gas burners are rated at 6,500 Btu per hour at full open. The heat value of a cu ft of methane is about 900 Btu.
(Sorry for the delay in responding. I just returned from a trip out of the country -- no access to the internet...)
Yes. Often, the C/N ratio is quite low, and adding these carbon sources improves it.this would suggest that some paper or sawdust/leaves would also help..
how long would this take to digest... perhaps 60 or 70% of the food converted to gas?
If batch feed, including startup if all goes well, maybe 30 days. But the 2-stage digester in continuous feed mode is designed for about 12 days.
A Btu is the amount of heat required to raise the temperature of one pound of water one degree F. So, if you are starting with water at room temperature (~70F) and want to raise it to 212F, that would require 212-70=142 Btu at 100% efficiency. (But you probably can't get anywhere close to that. Guessing maybe 30-40%? Dunno.)how much gas is used in a burner to cook?
Typical medium/small stovetop gas burners are rated at 6,500 Btu per hour at full open. The heat value of a cu ft of methane is about 900 Btu.
(Sorry for the delay in responding. I just returned from a trip out of the country -- no access to the internet...)