Open Source Biodigester Calculations: Difference between revisions
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(Added some more links under the “External Links” section) |
(Added some more links under the “External Links” section) |
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*** developed by the [[International Water Association]] ( [[IWA]] ) | *** developed by the [[International Water Association]] ( [[IWA]] ) | ||
*[https://pmc.ncbi.nlm.nih.gov/articles/PMC11895414/ A 2024 [[Open Access Paper]] Titled “ Open‐Source Anaerobic Digestion Modeling Platform, Anaerobic Digestion Model No. 1 Fast (ADM1F)” ] | *[https://pmc.ncbi.nlm.nih.gov/articles/PMC11895414/ A 2024 [[Open Access Paper]] Titled “ Open‐Source Anaerobic Digestion Modeling Platform, Anaerobic Digestion Model No. 1 Fast (ADM1F)” ] | ||
*[https://greene-tec.com/wp-content/uploads/2024/12/PlanET-Webinar-on-CSTR.pdf A 2024 Slide Deck from a PlanET Biogas Webinar Titled “Design Considerations for | |||
Anaerobic [[CSTR]] Digesters” ] | |||
Revision as of 20:15, 17 January 2026
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 1 gpf. - with most flushes at half - so an average 6 toilet flushes per day [6]. That is 4 gpd assuming 4 ppd and 2 spd.
- Thus, we must design for 5 gpd for toilet and kitchen sink loading per person.
- For 25 day retention time and 80% load derating - 32 biodigester totes serve 50 people in temperate climate zones. [7]
Cost
At the cost of insulated space and $1600 in totes assuming $50 per tote in surplus, the cost is attractive.
Septic tanks are $1/gal for comparison, while totes are 1/2-1/4 of this, minus the digging.
If gas and nutrient are a byproduct for a biodigester, that is where the win comes in. [8]
Internal Links
External Links
- A 2025 Paper Titled “ Dynamic Simulations of Anaerobic Digestion Plant” using Open Modelica.
- Anaerobic Digestion Model No.1 (Aka ADM1 )
- developed by the International Water Association ( IWA )
- Anaerobic Digestion Model No.1 (Aka ADM1 )
- A 2024 Open Access Paper Titled “ Open‐Source Anaerobic Digestion Modeling Platform, Anaerobic Digestion Model No. 1 Fast (ADM1F)”
- [https://greene-tec.com/wp-content/uploads/2024/12/PlanET-Webinar-on-CSTR.pdf A 2024 Slide Deck from a PlanET Biogas Webinar Titled “Design Considerations for
Anaerobic CSTR Digesters” ]