Flying Kites Biodigester and Grease Trap

Need & Opportunity

For years, the Flying Kites School relied on a septic tank and multiple soak pits to manage its wastewater. While the system was functional, it was overwhelming during the rainy seasons — the septic tank would overflow due to the excess groundwater, and as it was close to the river, some of the contaminated water would be washed towards the river.

This led to growing concern among the surrounding community, who relied on the downstream Sasumua River — a tributary that feeds into the Sasumua Dam, which contributes to approximately 12% of Nairobi’s water supply. The recurring overflow not only posed an environmental risk but also created tension with local authorities and the community, as the school was reported to inadvertently contribute to water pollution.

The challenge, therefore, extended beyond infrastructure; there was a need to protect the health of the local ecosystem, maintain positive community relations, while ensuring the school met regulatory standards for waste management.

Solution & Value Add

Flying Kites sought to implement a modern and sustainable waste-disposal solution, which was the construction of a 9,000-litre (250PE) biodigester fitted with electromechanical SBR technology, to treat the sewage wastewater, which then comes out clean and odourless and can be recycled to the toilets flushing systems or landscaping sprinkler mechanisms.

While the Client undertook the actual construction of the biodigester, CfC served as the Client’s representative; they provided ongoing technical guidance and offered construction management throughout the project. Ensuring that the works were executed as per the drawings, delivering the project within the specified quality, budget and time. The construction of the biodigester resolved the overflow issue and removed the risk of contamination of the Sasamua River.