The General Director of ONAS visits the Cambérène WWTP (Senegal) and congratulates Incatema for its good work

1 December, 2023

The Director General of ONAS (National Office of Sanitation of Senegal) Mamadou Mamour Diallo visited the site last Thursday, November 30, 2023, to see in person and in detail the state of completion of the works. After the tour of the facilities, he congratulated the entire Incatema team for the excellent work they are doing at the Cambérène Wastewater Treatment Plant, located north of Dakar, Senegal, and expressed his appreciation for the great effort that has been made.

"Currently," says Fernando Diaz, Incatema's Infrastructure Director, "we are concluding the last activities for the commissioning of the Cambérène Wastewater Treatment Plant in Senegal, with the aim of delivering it to the client (the National Sanitation Office of Senegal -ONAS-), before the end of this year".

The first process of the purification system to be implemented consists of pretreatment and primary treatment by physical methods, in order to eliminate the inert materials contained in the wastewater (coarse and fine solids, as well as fats in suspension), and where, in addition, a first clarification by sludge settling is carried out. This is followed by secondary wastewater treatment, which consists of a series of biological processes in the presence of oxygen (aerobic treatment) that use microorganisms to remove biodegradable organic matter.

Finally, the tertiary treatment process begins, which, through microfiltration and the use of ultraviolet rays, serves to eliminate pathogens that can compromise the health of the population. From this point on, the water can be safely and environmentally friendly reused for agricultural or recreational purposes (irrigation of parks and gardens) or returned to the natural environment.

The sludge generated at the WWTP, duly pre-treated, may be used in agriculture or as fuel.

"What we are culminating these days corresponds to the biogas tests that are being generated in the plant, for its energy use (electric cogeneration by combustion of the same), as well as the dehydration of sludge generated in both the primary and secondary treatment. These sludges, once dewatered by mechanical processes, can be used in agriculture after final drying treatment and conversion into compost, or also as solid fuel once transformed into pellets", adds Díaz.

Once these final processes have been completed, the plant can be delivered to the customer before the end of the year.

The WWTP start-up tests represent the last step before delivery to the customer, and their purpose is to verify the optimum operation of all the elements of the WWTP, as we have already reported here.

With the expansion and upgrading of the facilities that we are now completing, the Cambérène wastewater treatment plant, which treats the wastewater produced by a population of more than 1.6 million inhabitants, will acquire an average treatment capacity of 92,000 cubic meters per day, and will be able to handle treatment peaks of up to 101,000 cubic meters per day.

The project has a cost of 32 million euros, financed by the Islamic Development Bank. It is part of Senegal's environmental plan to improve air quality in North Dakar.