THE JANICKI OMNI PROCESSOR, a $2m machine paid for by the Bill & Melinda Gates Foundation, turns human waste into water and electricity. In poor cities such as Dakar in Senegal, where it has been piloted, the hope is that people will send sewage to sanitation plants to be processed, rather than chucking it into the streets.
This article appeared in the International section of the print edition under the headline “Shifting foundations”
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