Fig. 5. Model results for steady-state concentration of dissolved reactive phosphorus c(DRP), particulate phosphorus c(PP), and retention efficiency of bioavailable phosphorus as a function of the water residence time . Chosen model parameters were: V = 900 m³, A₀ = 1800 m², c_in(DRP) = 100 mg m^–3, µ_max = 1.3 mg P mg^–1 PP d^–1, K_S = 20 mg m^–3, k_set = 0.2 m d^–1, k_rel = 1 mg m^–2 d^–1.