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New Toilets

Science vol 337:673 10 Aug 2012

Gerty Ward

on 23 September 2013

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Transcript of New Toilets

The World Needs New Toilets
The Flush Toilet...
Clean water is scarce in many parts of the world.
Strict clean water regulations.
Sanitation critical for public health.
Building new sewer lines prohibitively expensive in many parts of the world.
Sewage treatment expensive and consumes energy.
More people are going!
Sanitation engineering
urine high in phosphorous (fertilizer)
dry poop does not smell, is less toxic and easier to process into fuel or compost.
Separating Toilets
...uses drinkable water.
...requires transport and
treatment of waste.
Bill & Melinda Gates Foundation
"Reinvent the Toilet Challenge"

Bacteria decomposes waste.
Generates heat to kill pathogens.
Heat can be used for cooking or to generate electricity
Does not smell or attract insects.
Psychological barriers to use.
Compost must periodically be removed.
Separation Toilets
Toilet 2.0
Toilet challenge winner!
Recovers and cleans the water
Composte or Digester toilets
Full transcript