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solving this problem would get you the Nobel prize and make you a billionaire
but I think some are over-thinking this
no mention of what one would cost

http://www.sciencealert.com/bill-gates-is-backing-a-revolutionary-waterless-toilet-here-s-how-it-works

Bill Gates is backing a revolutionary waterless toilet - here's how it works

Their mission is an important one: Estimates suggest more than 2.4 billion people around the world still live in unsanitary conditions. Without access to clean running water, these at-risk communities face life-threatening sanitation-related diseases.

The waterless and easy-to-use Nano Membrane is meant to offset this scarcity.



Alison Parker, a lecturer in International Water and Sanitation at Cranfield Water Science Institute, says her team’s new design is meant to serve poor urban areas, as those will be easiest to accommodate.



Residents can then use the water for tending to their plants, cleaning their homes, cooking, and bathing. The solid waste ends up at a thermo-processing plant to be turned into energy for the community.



According to Parker, one toilet can accommodate up to 10 people for no more than $0.05 per day, per user - in line with the Bill and Melinda Gates Foundation’s original criteria for the prize. Field testing will begin later this year, Parker says.



One challenge moving forward, which other designs have run into, is scalability.

While many designs work in theory, actually getting the toilets to the countries that need them isn’t easy.



Parker admits the problem of toilet paper is still one the Nano Membrane Toilet has yet to resolve, as users have no choice but to toss the paper into a nearby waste bin.




so one of these can handle ten people

2,400,000,000/10 = 240,000,000 units with batteries

given the these people are poor, I suspect they wouldn't have enough money to buy one of these
so would this be a "rental"?
and to whom? the local government?
 
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