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Ratio of wastewater treatment

Year: 2010 Author: UNEP/GRID-Arendal, Hugo Ahlenius
Description:
The ratio of treated to untreated wastewater reaching water bodies for 10 regions. An estimated 90 per cent of all wastewa- ter in developing countries is discharged untreated directly into rivers, lakes or the oceans (UN Water, 2008).
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