Burger, R. (2000). Phenomenological foundation and mathematical theory of sedimentation-consolidation processes. Chemical Engineering Journal, volume 80, 177-188. Burger, R., Diehl, S., Farˆas, S., Nopens, I. and Torfs, E. (2013). A consistent modelling methodology for secondary settling tanks: a reliable numerical method. Water Science & Technology, Volume 68.1. Cadet, C., Dos Santos Martins, V., Dochain, D. (2015). Dynamic Modeling of Clarifier-Thickeners for the Control of Wastewater Treatment Plants: A Critical Analysis (I). 19th Int. Conference on System Theory, Control and Computing,Romania, October 14-16. Chauchat, J., Guillou, S., Pham van Bang, D., Dan Nguyen, K. (2013). Modeling sedimentationconsolidation in the framework of a one-dimensional two-phase flow model. Journal of Hydraulic Research, 51 (3), 293-305. David R., Saucez P., Vasel J.L., Vande Wouwer A. (2009). Modeling and numerical simulation of secondary settlers: A method of Lines strategy. Water Research, volume 25.43, 319 - 330. Diehl S. (2000). On boundary conditions and solutions for ideal clarifier - thickener units. Chemical Engineering Journal, 80, 119-133. Drew, D. A. (1982), Mathematical Modeling of two-phase flow, Technical Summary Report n° 2343, 51 pages, Mathematics Research Center, University of Wisconsin – Madison, USA. Duindam, V., Macchelli, A., Stramigioli, S., Bruyninckx, H. (2009), Modeling and Control of Complex Physical Systems: The Port-Hamiltonian Approach, Chapter 3, Springer Science & Business Media Garrido, P., Concha, F., Burger, R. (2003). Settling velocities of particulate systems: 14. Unified model of sedimentation, centrifugation and filtration of flocculated suspensions. Int. J. Mineral Processing, vol. 72, 57-74. Kynch, G.J. (1952). A Theory of Sedimentation. Trans.Faraday Society, volume 48, 166-176. Li, B., Stenstrom, M.K. (2014). Research advances and challenges in one-dimensional modeling of secondary settling Tanks - A critical review. Water Research, volume 65, 40-63. Martin, M., Hoyos, M. and Lhuillier D. (1994), Sedimentation equilibrium of suspensions of colloidal particles at finite concentrations, Colloid & Polymer Science, 272:1582-1589 Queinnec, I., Dochain, D. (2001). Modelling and simulation of the steady-state of secondary settlers in wastewater treatment plants. Water Sci. Technol., 43 (7), 39-46. Takacs, I., Party, G.G., Nolasco, D. (1991). A dynamic model of the clarification thickening process. Water Research, volume 25(10), 1263-1271. Toorman, E. A. (1996). Sedimentation and self-weight consolidation: general unifying theory. Geotechnique, 46, 103-113. Valentin, C., Magos. M., Maschke. B. (2007), A port- Hamiltonian formulation of physical switching systems with varying constraints. Automatica, vol. 43:7, 1125- 1133. Valentin, C., Dochain, D., Jallut, C., Dos Santos Martins, V. (2020), Representation of a Continuous Settling Tank by Hybrid Partial Differential Non Linear Equations for Control Design, World congress IFAC 2020, Berlin, Germany. July 12-17 (6 pages). Vesilind, P. A. (1968). Design of prototype thickeners from batch settling tests. Water Sewage Works, 115, 302-307.