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Senegal’s ONAS awards Tedagua the construction of the Disez WWTP

Senegal’s ONAS awards Tedagua the construction of the Disez WWTP

The Government of Senegal, through its National Sanitation Office (ONAS), has awarded the Tedagua/SVTP-GC Consortium the contract for the design and construction of the new wastewater treatment plant of the Dakar Integrated Special Economic Zone (Disez). The € 9.6 m contract is expected to be completed in 16 months.


In accordance with its economic policy – aimed at building investment-promoting infrastructures – the Government of Senegal together with various partners, has launched several programmes aimed at setting up a business park and industrial estate. The purpose of this area, known as the Dakar Integrated Special Economic Zone (Disez), is to attract industrial and trade companies to conduct their activities in Senegal. According to forecasts, this zone will become the country’s most important economic centre, overtaking current industrial areas. The first phase of the project envisages the construction of roads, housing developments and utility networks, of which the treatment of rainwater and wastewater is a major part.


The contract awarded to Tedagua includes building the wastewater treatment plant to be located in the rural community of Diass and will service the entire Disez. The first stage of the plant will treat an average flow rate of 4,200 m3/d and ensure treatment of effluents generated during the first phase of the Disez, thus paving the way for future expansion of the plant in stages 2, 3 and 4.


The planned water treatment process will be carried out on a single pipeline except for the screening of fine and coarse materials, for which two lines have been provided, and filtering, which requires four lines. In general, the planned water treatment system consists of a biological process of activated sludge and medium load and is divided into three main stages: a first stage corresponding to pre-treatment and de-sanding and degreasing, a second stage of primary treatment and a third stage of biological treatment and medium load in biological reactors and decanters. Finally, the system will also include a tertiary treatment consisting of pressure filtering and the application of UV-rays before the final discharge of the effluent.


With this new contract, Tedagua strengthens its position in Africa, after having won two other contracts in the last year: one in Tunis for the Nabeul water treatment plant and the other in Cameroon for the refurbishment, upgrading and extension of the drinking water supply systems of Bangangté and five other nearby towns.

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