Biodigester Sizing
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300 People
- About 7 cubic meters for 300 people boarding school in the tropics - [1]
24 People
- For toilet water - we have 4 gallon max per person per day - at 0.5 gpf for liquids.
- Shower water goes directly to septic fertigation
- Biodigester waste is held for 30 days. 24 people *4 gal = about 100 gpd. The actual solids, if they settle, they stay as long as they like - there is only under a liter of feces per day [2].
- It seems that septic tank calculations allow for no retention time, just one day's hold. This makes sense if solids settle on a daily basis, so that discharge water is not too loaded. [3]
- Design: send shower and wash sink water directly to septic fertigation. Toilet water goes into digester.