Open Source Biodigester Calculations

Number of People Served

Design goal for scalable systems is for a 16x16 foot room to handle the waste of 100 people [1], 100 chickens [2], or 25 pigs [3]. This is a design that can handle pigs if humans chose pork and beans as their protein staple.

With biodigester totes (1 cubic meter) stacked 2 high - a 16x16 foot room can accommodate 32 of such totes.

Chat says 1 cubic meter serves 4 people.

First Principle Calculation

• Limit is water volume handling from appliances, assuming that this water dilutes organic waste sufficiently
• Thus, must essentially design for toilet flow, as a dishwasher uses about 1 gallon per person per day [4] and average toilet flow is 12 gpppd (gallons per person per day) [5] and 8 gpppd for efficient toilets.
• In the Supertoilet case, we have a figure of 0.5 gpf or 0.8 gpf.