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Biogas |
Our resident Biogas aficionado...
Upflow Anaerobic Sludge Blanket
Small scale biogas systems start with your fuel needs, waste and odor mitigation are prime benefits. Here's the basis for our system it is out dated but considers efficiencies and what we might consume (Household Fuel Requirements).
If you would like to collaborate and get it done drop me a note - jeff@renaissancefarms.com
In the 80's I did
manage to get a digester running. Yes my
parents were supportive, how many let you fill giant tractor inner tubes with
flammable gas?
| Minimum Demand of Typical Gas Appliances in BTUs Per Hour Appliance Demand in BTU/hour | ||||
| Appliance | BTU/hr | BioGallons, 750 BTU/ft^3 | $Gasoline($3/gal) | $Electric ($0.0736/kWh) |
| Barbecue (residential) | 40,000 | 400 gallons | $1.05 | $0.82 |
| Domestic clothes dryer | 35,000 | 350 gallons | $0.92 | $0.75 |
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Domestic Gas Range (boil 30 gallons of 57 degF water @ 62% efficiency) |
65,000 | 650 gallons | $1.71 | $1.40 |
| Domestic Recessed Oven Section | 25,000 | 250 gallons | $0.66 | $0.54 |
| Fireplace Gas Log | 80,000 | ? | ? | ? |
| Gas Refrigerator | 3,000 | 30 gallons | $0.08 | $0.06 |
| Storage Water Heater, 30-40 gallon tank | 35,000 | 350 gallons | $0.92 | $0.75 |
| Storage Water Heater, 50 gallon tank | 50,000 | 500 gallons | $1.32 | $1.08 |
| 1150 gallons | $2.50 | |||
| A word on efficiency before we move on. The BTU values above include inefficiencies and 62% is typical for hot water heaters and bet it's similar to heat a pot of water on the stove. With that said here is a ROI thought experiment... | |||
| Capital Investment | ROI days | ROI years | |
| $1000 | $2.50/day | 400 | 1.1 |
| $5000 | $2.50/day | 2000 | 5.5 |
A horse makes how much poo?
jeff@renaissancefarms.com
