This first project will focus on the execution of the new wastewater treatment plant in the North of Greater Tunis (also called El Hessiane WWTP) located in the North of Greater Tunis to meet the required capacity needs for the next 20 years. As per ONAS masterplan study, it is required to increase the hydraulic capacity by an additional 60,000 m3/d to meet the planned demand in line with the forecasts for the year 2035.
Based on the studies, it has been decided to establish the new North WWTP in El Hessiane area, as there is a land available for building the new station away from the urban areas. Constraints were found in relation to soil characteristics and the need for deep foundations during construction works.
There are opportunities for reuse of treated wastewater from the North wastewater plant in the existing Cebela-Borj Touil perimeter, which is the largest irrigated perimeter from treated wastewater in Tunisia. This perimeter, created in 1989, covers a total gross area of 3200 ha and is fed from treated wastewater produced by the three wastewater treatment plants of Cherguia,Choutrana (I and II) and Coastal North.
As per the updated studies, there is a planned extension for the irrigated perimeter of Borj Touil, and therefore, there is a potential for the use of wastewater processed from the new North WWTP.
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Project stage info
Stage 1: Initial Government Announcement
Government of Tunisia
Form of project announcement
The main objective is to improve the operation of the existing WWTPs and to provide sufficient capacity to meet future needs.
ONAS has embarked on a capacity expansion program in Greater Tunis from 276,250 m3/d to 336,250 m3/d, by adding an additional 60,000 m3/d.
This extension will be planned considering the following elements:
. The short-term abandonment of the treatment plant in the northern coastal zone, which serves the northern suburbs of Tunis;
. The development in the North water basins of Greater Tunis, notably Raoued and La Soukra;
. The abandonment of the treatment plant Kalâat El Andalous and its connection to the future WWTP of North Tunis.
This project is in response to current environmental requirements, consisting of the selection of a site as well as the establishment of a new WWTP of 60,000 m3/d, sewage and water transfer pipelines and the identification of recipients irrigated by treated wastewater.
Indicative timetable of project development
Tender procedure to begin in Q2 2018
Duration of work estimated to be 24 month
Operational stage to be reached in Q2 2021
There are no Project documents available at this time
Project looking for additional PPF assistance
Project looking for additional MDB assistance
Is project multi jurisdictional?
Stage 2: Project Investigation
89.9 M USD 257 M TND
Indicative Funding Source
Have any external advisors been appointed yet
Details of Advisors appointed
Is the project contained in national/sub national infrastructure plan or strategy
Plan/Strategy Document URL:
Please outline any studies (for example environmental, engineering etc.) that will be completed prior to a full business case development
Technical, Economical and Social Study