Water Quality Modelling of the Sebou River Estuary (Morocco) before and after the Installation of the Kenitra City's Wastewater Treatment Plant

• Autorzy: Nizar Youness , Touazit Azzeddin , Igouzal Mohamed

Identyfikatory

DOI

10.12912/27197050/152956

• Języki publikacji: EN

Abstrakty

EN

Urban wastewaters from Kenitra had been discharged without prior treatment through six collectors into the Sebou estuary (60 km) causing in the process health and environmental problems up until WWTP was installed in 2020. The waste water treatment plant (WWTP) had to gather all urban wastewaters in order to go through treatment. Thus, the WWTP, situated 17 km from the mouth of the estuary, has become the only discharge point for treated domestic wastewater into the Sebou estuary. This study aims to model the Sebou estuary water quality and assessment of the impact of WWTP. Our study started with hydraulic modelling of the river using a 1D model (HECRAS 5.0.6), since water quality is strongly depending on hydraulic regime. HEC RAS has been calibrated and validated using hydraulic and morphological database of the years 2019 and 2021. The spatiotemporal evolution of hydraulic variables (water velocity, water level, etc.) was calculated by the hydraulic model and used in the water quality module to simulate the biochemical oxygen demand (BOD₅). Two scenarios were put under examination, one is a simulation of discharges of untreated wastewaters by six collectors (mean BOD₅ of 300 mg/L) and the second is a simulation of discharge after treatment at the WWTP (mean BOD₅ of 24 mg/L). The simulation showed an Impact of the tidal cycle and fresh water flows (coming from the upstream) on the urban wastewater discharges fate. Calculations of the BOD₅ provided by the model are in good agreement with field measurements. The first simulation results show that water quality of the Sebou River does not meet WHO standards (average quality about 7 mg/l of BOD₅). The second simulation shows that the treatment plant reduces the concentration of BOD₅ in the river to about 3 mg/l compared to the case before their installation, the quality of the water in the estuary is changing to become good after having been just average. In addition, the BOD₅ concentration downstream of the WWTP changes according to the tidal cycle. Finally, the results show the very positive impact of Kenitra’s WWTP on the water quality of the Sebou River estuary.

Słowa kluczowe

EN

Sebou estuary; water quality; modeling; HEC-RAS; BOD5; Kenitra

• Wydawca: Lubelski Oddział Polskiego Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology ; WNGB Wydawnictwo Naukowe
• Czasopismo: Ecological Engineering & Environmental Technology
• Rocznik: 2022
• Tom: Vol. 23, iss. 6
• Strony: 264--274
• Opis fizyczny: Bibliogr. 21 poz., rys.

Twórcy

autor

Nizar Youness

• Laboratory of Electronic Systems, Information Processing, Mechanics and Energy, Department of Physics, Faculty of Science, Ibn Tofail University, BP1246 Kenitra, Morocco

• https://orcid.org/0000-0002-4889-3392

autor

Touazit Azzeddin

• Laboratory of Electronic Systems, Information Processing, Mechanics and Energy, Department of Physics, Faculty of Science, Ibn Tofail University, BP1246 Kenitra, Morocco

• https://orcid.org/0000-0003-3926-0187

autor

Igouzal Mohamed

• Laboratory of Electronic Systems, Information Processing, Mechanics and Energy, Department of Physics, Faculty of Science, Ibn Tofail University, BP1246 Kenitra, Morocco

• https://orcid.org/0000-0002-9659-3503

Bibliografia

• 1. Brunner, G. 2016. River Analysis System Hydraulic Reference Manual (HEC-RAS 5.0 Reference Manual). Davis California, USA: U.S. Army Corps of Engineers, Hydrologic Engineering Center (HEC).
• 2. Combe, M. 1996. Etude des marées dans l’oued Sebou et des pollutions qu’elles provoquent à l’étiage (Study of Tidal Cycle in the Sebou Estuary During Low Water). Rapport inédit, Rabat, MTPC/DH DRE, 108.
• 3. El-Blidi, S., Fekhaoui, M. 2003. Hydrology and tidal dynamic in the Sebou estuary (Gharb, Morocco). Bull. Inst. Sci. Rabat, Sect. Life Sci, 25, 57–65.
• 4. Fennell, J., Soulsby, C., Wilkinson, M., Daalmans, R., Geris, J. 2022. Assessing the role of location and scale of Nature Based Solutions for the enhancement of low flows. International Journal of River Basin Management, 1–16.
• 5. Fischer, H., List, E., Koh, R., Imberger, J., Brooks, N. 1979. Mixing in Inland and Coastal Waters. New York: Academic Press, 483.
• 6. Haddout, S., Baimik, I., Maslouhi, A., Igouzal, M., Bouchaib Magrane, B., Marah, H. 2019. The influence of spring and neap tide on salt intrusion and stratification in Sebou estuary (Morocco). International Journal of River Basin Management, 17(1), 131–142. https://doi.org/10.1080/15715124.2018.1476365
• 7. Haddout, S., Igouzal, M., Maslouhi, A. 2017b. Seawater intrusion in semi-closed convergent estuaries (case study of Moroccan Atlantic Estuaries): Application of salinity analytical models. Journal of Marine Geodesy, 40, 275–296.
• 8. Haddout, S., Maslouhi, A., Igouzal, M. 2017a. Predicting of salt water intrusion in the Sebou river estuary (Morocco). Journal of Applied Water Engineering and Research, 5, 40–50.
• 9. Haddout, S., Maslouhi, A., Magrane, B., Igouzal, M. 2016. Study of salinity variation in the Sebou River Estuary (Morocco). Desal. Water Treat, 57, 17075–17086.
• 10.Ji, Z.G. 2008. Hydrodynamics and Water Quality: Modeling Rivers, Lakes, and Estuaries. John Wiley & Sons Inc., Hoboken, New Jersey.
• 11. Kettab, A. 2014. Water for all with quality and quantity: it is the concern of all!. Desal. Water Treat, 52, 1965–1966.
• 12. Mergaoui, L., Fekhaoui, M., Bouya, D., Gheı¨t, A., Stambouli, A. 2003. Water quality and benthic macrofauna the estuarine environment of Morocco: The case of the Sebou estuary. Bull. Sci. Inst. Sect. Life Sci, 25, 67–75.
• 13. Nizar, Y., Igouzal, M. 2022a. Assessment of urban wastewater pollution discharged by the Moroccan city of Kenitra at the Sebou river estuary. Poll Res,, 41 (2), 153–162.
• 14. Nizar, Y., Touazit, A., Igouzal, M. 2022c. Predicting the thermal regime of the Sebou river estuary (morocco) using a one-dimensional model (HEC-RAS 5.0). Nature Environment and Pollution Technology, 21(2), 883–890.
• 15. Nizar, Y., Touazit, A., Igouzal, M. 2022b. Water quality modelling of Sebou River estuary (Morocco) after the installation of the Kenitra town’s WWTP. Desal. Water Treat, 1–8.
• 16. Rahmati, M., Tishehzan, P., Moazed, H. 2021. Determining the best and simple intelligent models for evaluating BOD5 of Ahvaz wastewater treatment plant. Desal. Water Treat, 209, 242–253.
• 17. Haddout, S.A.M. 2016. Study of salinity variation in the Sebou River Estuary (Morocco). Desal. Water Treat, 57, 17075–17086.
• 18. Sathya, A., Thampi, S., Chithra, N. 2021. Development of a framework for sand auditing of the Chaliyar River basin, Kerala, India using HEC-HMS and HEC-RAS model coupling. International Journal of River Basin Management, 1–14. https://doi.org/10.1080/15715124.2021.1909604
• 19. Shehata, D., Abdelmonem, Y., Soussa, H., Abdel-fattah, S., Moussa, A. 2019. Assessment of Longitudinal Dispersion Coefficient Using One-dimensional Numerical Modeling Equation. IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE), 16(4), 57–66.
• 20. Thatcher, M., Harleman, D. 1981. Long-term salinity calculation in Delaware estuary, 107(11–27).
• 21. Wahaba, N., Kamarudina, M., Torimanb, M., Juahira, H., Saada, M., Ataa, F., Harithe, H. 2019. Sedimentation and water quality deterioration problems at Terengganu River Basin, Terengganu, Malaysia. Desal. Water Treat, 149, 228–241.

Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).