Sade, a subsidiary of the NGE Group, wins a new contract in Senegal to complete the depollution of Hann Bay – the first large-scale industrial depollution project in West Africa
After being awarded the Lot 1 of the Hann Bay depollution project in 2023, Sade – NGE Group’s subsidiary dedicated to the water cycle – has once again been chosen by Senegal’s National Sanitation Utility ONAS (Office National de l’Assainissement du Sénégal) to carry out the Lot 7 of this flagship program aimed at combating environmental degradation and the depletion of natural resources.
Stretching over 20 kilometres from Dakar Port to the city of Rufisque, the Baie de Hann was once considered one of the most beautiful bays in the world. Over time, rapid industrial development and urban growth in the surrounding area have caused severe degradation. The level of marine and coastal pollution has led to environmental, health, and social consequences directly affecting more than 500,000 people.
In 2018, the Government of Senegal entrusted ONAS with the management of the Hann Bay depollution project, which involves the construction of collection, treatment, and marine outfall infrastructure for local industrial and domestic effluents. Sade began work on the project at the end of 2023 with Lot 1, focused on building the main interceptor, and now concludes it with Lot 7, dedicated to the final connection of the collection network at Dakar Port.
Financed by the Agence Française de Développement (AFD) and the China Development Bank (CDB), this lot marks the final stage of the overall programme.
Over a 20-month period, NGE’s teams will carry out:
• Laying 23 kilometres of wastewater pipelines in PVC and cast iron, with diameters ranging from 250 to 500 mm;
• Laying 8 kilometres of reinforced concrete stormwater collectors, including BONNA-type pipes (20%, Ø 800–1100 mm) and concrete box culverts (80%, from 1 x 1 m to 2 x 1.5 m);
• Building more than 1,000 reinforced concrete manholes
• Constructing and equipping six pumping and discharge stations, including all electromechanical systems.
To improve operational efficiency, part of the concrete structures will be prefabricated directly on site by NGE teams. Up to 80 employees will be mobilised at peak activity.
“Completing this project, which we began with Lot 1, illustrates the continuity of our partnership with ONAS and the complementary expertise of Sade and the NGE Group. Through this project, we reaffirm our determination to act concretely for territorial development and the preservation of water resources,” said Frédéric Bernadet, Managing Director of Sade.
NGE established its presence in Senegal in 2017 through its rail subsidiary TSO, contributing to one of the country’s landmark projects: the reconstruction of the Dakar “TER” regional railway line dedicated to freight and mining transport. Since then, local teams have created an NGE
subsidiary in Senegal and expanded their scope of activity. They now offer a multi-expertise approach, contributing to the development of essential public infrastructure and the preservation of natural environments – as shown by the ongoing coastal protection works on Goree Island, a UNESCO World Heritage Site.
In 2024, with the acquisition of Sade – established in Senegal since 1978 – NGE strengthened its presence and commitment in the water cycle and natural resource management sectors.
Today, NGE in Senegal employs nearly 200 people, promotes local employment, and invests in training for sustainable professions.