The threat of water contamination in Nakuru, Kenya is real, as human waste is often dumped in storm drains and rivers, or is buried in low-income areas. Faeces are also finding their way into nearby Lake Nakuru, polluting the ecosystem.

As there is a need for a better way to dispose of the large quantities of human waste generated each day, the Nakuru Water and Sanitation Services Company (NAWASSCO) collects the waste from pit latrines and septic tanks around Nakuru by truck and transported it to a waste water treatment plant. At the plant briquettes are manufactured from human poo and sawdust collected around the town, northwest of Nairobi, in the Great Rift Valley.

The sludge is discharged into drying beds in a greenhouse, and left to dry for two to three weeks. The dried-out sludge is then treated at high temperatures with accompanying sawdust. Next, the carbonised materials are ground into fine particles using a hammer mill, before being mixed together and transformed into small, round balls in a rotating drum.

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Photo credit: Sustainable sanitation via Foter.com / CC BY