Optimization of Submarine Outfalls with a Multiport Diffuser Design

  • Salvatore Sinopoli
  • Marco Amos Bonora
  • Gilda Capano
  • Manuela Carini
  • Daniela Pantusa
  • Mario MaioloEmail author
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 11973)


Immission of civil sewage into sea is realized to complete the onshore depurative process or to take out the already purified waste-water from the bathing area, ensuring a good perceived seawater quality. Anyhow the compliance of the pollutant concentrations limits is necessary to ensure safe bathing. The design of submarine pipes is usually completed contemplating a diffuser with a series of ports for the repartition of the wastewater discharge. The real process of pollutants diffusion into the sea, simulated with complex diffusion-dispersion models in a motion-field dependent from environmental conditions and drift speeds, affect the submarine pipe design. A design optimization procedure has been realized for the marine outfall pipe-diffuser system using a simplified zone model, subjected to a sensitivity analysis on the characteristic parameter. The method is shown using an example project for the submarine outfall at service for the sewage treatment plant of Belvedere Marittimo, on the southern Tyrrhenian Sea in Italy.


Sea water quality Submarine outfalls Optimization design Multiport diffuser 



Research supported by the Italian Regional Project (POR CALABRIA FESR 2014–2020): “TEMAR” [J68C17000150006].


  1. 1.
    Agg, A.R., White, W.R.: Devices for the pre-dilution of sewage at submerged outfalls. In: Proceedings of the Institution of Civil Engineers, vol. 57, no. 1, part 2, pp. 1–20 (1974)CrossRefGoogle Scholar
  2. 2.
    Abraham, G.: Jet diffusion in stagnant ambient fluid. Delft Hydraulics Laboratory 29 (1963)Google Scholar
  3. 3.
    Abraham, G.: Horizontal jets in stagnant fluid of other density. J. Hyrdraulics Div. 91(4), 139–154 (1965)Google Scholar
  4. 4.
    Benfratello, G.: Scarichi sottomarini: aspetti idraulici e fenomeni di diffusione. In: Proceedings Immissione di acque reflue in mare. A.I.I., Ischia, Italy (1989)Google Scholar
  5. 5.
    Botelho, D.A., et al.: Marine Outfall Systems: Current Trends. Research and Challenges. IWA Specialist Group (2016)Google Scholar
  6. 6.
    Brooks, N.H.: Diffusion of sewage effluent in ocean current. In: Proceedings of the First International Conference on Waste Disposal in the Marine Environment. Pergamon Press (1959)Google Scholar
  7. 7.
    Brooks, N.H.: Conceptual design of submarine outfalls - jet diffusion. In: Water Resources Engineering Educational Series, Program VII, Pollution of Coastal and Estuarine Waters (1970)Google Scholar
  8. 8.
    Cederwall, K.: Gross parameter solution of jets and plumes. J. Hydraulics Div. 101(HY5), 489–509 (1975)Google Scholar
  9. 9.
    Charlton, J.A.: Developments in Hydraulic Engineerings. Sea Outfalls 3(3), 73–128 (1985)Google Scholar
  10. 10.
    Fisher, H.B., Imberger, J., List, E.J., Koh, R.C.Y., Brooks, N.H.: Mixing in Inland and Coastal Waters. Academic Press, New York (1979)Google Scholar
  11. 11.
    Forrest, S., Rustum, R.: Design optimisation of marine wastewater outfalls. Int. J. Sustainable Water Environ. Syst. 8(1), 7–12 (2016)Google Scholar
  12. 12.
    Hernández-Sancho, F., Lamizana-Diallo, B., Mateo-Sagasta, J., Qadir, M.: Economic valuation of wastewater - the cost of action and the cost of no action-United Nations Environment Programme (2015). ISBN: 978-92-807-3474-4Google Scholar
  13. 13.
    Holly, F.M.: Sea outfalls. In: Development in Hydraulic Engineering, vol. 3, no. 1, pp. 1–37. Elsevier Applied Science Publisher, London (1985)Google Scholar
  14. 14.
    Maiolo, M., Pantusa, D.: A proposal for multiple reuse of urban wastewater. J. Water Reuse Desalination 8(4), 468–478 (2017)Google Scholar
  15. 15.
    Maiolo, M., Pantusa, D.: Combined reuse of wastewater and desalination for the management of water systems in conditions of scarcity. Water Ecol. 4(72), 116–126 (2017)Google Scholar
  16. 16.
    Mc Cuen, R.H.: The role of sensitivity analisys in hydrologic modeling. J. Hidrology 18, 37–53 (1973)CrossRefGoogle Scholar
  17. 17.
    Occhipinti, A.G.: Bacterial disappearance experiments in Brazilian coastal waters. In: Proceedings of Immissione di acque reflue in mare. A.I.I., Ischia, Italy (1989)Google Scholar
  18. 18.
    Rahm, S.L., Cederwall, K.: Submarine disposal of sewage. In Proceedings on the XI Congress IAHR, Leningrad (1965)Google Scholar
  19. 19.
    Rodriguez-Garcia, G., Molinos-Senante, M., Hospido, A., Hernandey-Sancho, F., Moreira, M.T., Feijoo, G.: Environmental and economic profile of six typologies of wastewater treatment plants. Water Res. 45, 5997–6010 (2011)CrossRefGoogle Scholar
  20. 20.
    Shannon, N.R., Mackinnon, P.A., Hamill, G.: Modelling of saline intrusion in marine outfalls. In: Proceedings of the Institution of Civil Engineers. Maritime Engineering, vol. 158, no. MA2, pp. 47–58 (2005)CrossRefGoogle Scholar
  21. 21.
    Veltri, P., Maiolo, M.: Un modello di zona per il trattamento marino dei liquami. In: Proceedings on the XXII Corso di Aggiornamento in Tecniche per la Difesa dall’Inquinamento, pp. 417–451. Bios, Cosenza (1991)Google Scholar
  22. 22.
    Veltri, P., Maiolo, M.: Un criterio ambientale per il calcolo degli scarichi dei liquami in mare. In: Proceedings on the XXIII Hydraulics and Hydraulic infrastructures, Firenze (1992)Google Scholar
  23. 23.
    Veltri, P., Maiolo, M.: Environmental aspects in the use of sea outfalls: a sensitivity analysis. In: Marina Technology. Computational Mechanics Publications (1992)Google Scholar
  24. 24.
    Veltri, P., Maiolo, M.: Modelli Matematici di dispersione dei liquami in Mare e Indagini su campo. Ingegneria Sanitaria Ambientale (1993)Google Scholar
  25. 25.
    Veltri, P., Morosini, A.F., Maiolo, M., Carratelli, E.P.: Analysis of Sea Current and Diffusion Data at a Submarine Sewage Outfall, pp. 169–179. Computational Mechanics Publications, Southampton (1997)Google Scholar
  26. 26.
    Vigliani, P.G., Sclavi, B., Olivotti, R., Visconti, A., Tartaglia, G.F.: Indagine sperimentale sulla diluizione iniziale dei liquami versati a mare da un diffusore, vol. 3, pp. 129–140. Ingegneria Sanitaria (1980)Google Scholar
  27. 27.
    Viviani, G.: Il progetto delle condotte sottomarine: una semplificazione nell’uso dei modelli complete, vol. 18, pp. 327–339. Ingegneria Ambientale (1989)Google Scholar
  28. 28.
    Wei, W., Zhong-min, Y.: Evaluation of three-dimensional numerical model for saline intrusion and purging in sewage outfalls. J. Hydrodynamics Ser. B 19(1), 48–53 (2007)CrossRefGoogle Scholar
  29. 29.
    Wilkinson, D.L.: Avoidance of seawater intrusion into ports of ocean outfalls. J. Hydraulic Eng. 114(2), 218–228 (1988)CrossRefGoogle Scholar

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Authors and Affiliations

  1. 1.Department of Environmental and Chemical Engineering (DIATIC)Università della CalabriaArcavacata di RendeItaly

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