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Dry Toilets
Why Use Dry Toilets ?

Our Relation to our Dejecta

Three Generations of Dry Toilets

The BLT Instruction Manual
Chemical Composition of Human Dejecta
Composting Human Dejecta
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The text within this page was first published in French on www.eautarcie.com : in 2003

The original text has since been adapted and first published in English on this page at www.eautarcie.org : 2009-06-15

Last update : 2009-10-29

Chemical Composition of Human Dejecta

Source: Composting: Sanitary Disposal and Reclamation of Organic Wastes, by Harold B. Gotaas, monograph under WHO auspices, 1956, p. 35

Human faeces material without urine
Approximate quantity : 150 to 270 g (0.3 - 0.6 lb.) per capita per day moist weight
Approximate composition : Moisture content 66 - 80 %
  Organic matter (dry basis) 88 - 97 %
  Nitrogen (dry basis) 5.0 - 7.0 %
  Phosphorus (P2O5) (dry basis) 3.0 - 5.4 %
  Potassium (K2O) (dry basis) 1.0 - 2.5 %
  Carbon (dry basis) 40 - 55 %
  Calcium (CaO) (dry basis) 4.0 - 5.0 %
  C/N Ratio 5.0 - 10.0
Human urine
Approximate quantity : Volume: 1.0 to 1.3 litres (1¾ - 2¼ pints) per capita per day
  Dry solids: 50 to 70 g (0.12 – 0.16 lb.) per capita per day
Approximate composition : Moisture content 93 - 96 %
  Organic matter (dry basis) 65 - 85 %
  Nitrogen (dry basis) 15 - 19 %
  Phosphorus (P2O5) (dry basis) 2.5 - 5.0 %
  Potassium (K2O) (dry basis) 3.0 - 4.5 %
  Carbon (dry basis) 11 - 17 %
  Calcium (CaO) (dry basis) 4.5 - 6.0 %
Nitrogen content

Faecal matter :

5. 4 g (35%)
Urine : 10.2 g (65%)

To continue reading, go to chapter on Composting human dejecta.

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