Dakar's urban markets generate large volumes of organic residual matter (ORM) every day, much of which is sent to the Mbeubeuss landfill or abandoned in the environment. In addition to posing sanitary and logistical problems, this management represents a lost opportunity in a context of vulnerability of peri-urban agricultural systems. On the outskirts of the capital, the Grande Niaye area is home to a strategic market-gardening activity but is facing soil impoverishment and increasing dependence on chemical inputs. This situation highlights the need to evaluate localized solutions for closing organic waste cycles.
The aim of this dissertation is to assess the potential for agricultural recovery ORM from Dakar markets, with a view to the circular economy and local resilience. Using a mixed-method approach combining field surveys, semi-structured interviews, quantitative surveys and participatory mapping, the study identifies the specific needs of producers, the composition and seasonality of available organic waste, as well as the territorial configurations favorable to their routing.
The results show that the markets studied generate around 1,250 tonnes of dry ORM per month, which, combined with agricultural residues, would enable the production of up to 18,000 tonnes of compost per year. Recycling just 18% of this waste stream would be enough to meet the organic matter needs of the 60.7 hectares of soil in Grande Niaye, representing a monthly collection of 289 tonnes of dry organic waste. However, the efficient use of these resources depends on two key factors: firstly, the need for rigorous pre-sorting at source to remove nonorganic waste and contaminants; and secondly, technical control of the composting process, which is essential to ensure that the final product meets the expectations of market gardeners. With a view to using ORM as a soil amendment for market gardening in the Grande Niaye area, there is still a potassium deficit, requiring additional mineral inputs. The study also highlights the logistical, social and institutional challenges associated with implementing such a system. The cross-referencing of territorial and technical data makes it possible to formulate concrete proposals for integrated waste management, with scenarios for structuring a resilient and inclusive sector. This work underlines the role of local authorities, waste management stakeholders and producer organizations in implementing solutions adapted to the Senegalese context.
| Date | 28 Jul 2025 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Mathias Glaus (Supervisor) & Malick Diouara (Co-supervisor) |
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Charles, L. (Author),
Glaus (Supervisor) & Diouara (Co-supervisor),
28 Jul 2025Student thesis: Master's thesis › Master in Engineering: Environmental Engineering