Roman, Marius-DanielMarius-DanielRomanMare, RoxanaRoxanaMareHadarean, AdrianaAdrianaHadarean2018-10-222018-10-222018L:1843-5831 (online); 2457-837110.21698/simi.2018.fp42http://hdl.handle.net/123456789/1275International Symposium "The Environment and the Industry", 20-21 September, 2018, Bucharest, Romania, pp. 354-361Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) are the most commonly used parameters for the characterization of the organic pollution of wastewaters. Both of these parameters have advantages and disadvantages and the choice usually depends on many factors such as the time period required to determine each one of them. It is essential to obtain a control between BOD and COD for various wastewater treatment plants, to help in the design and operation of these plants. In this paper the modelling results of BOD and COD for an aeration tank from Dej wastewater treatment plant by Matlab/Simulink software program has no significant difference, because the results are close enough to the real ones that allow the user to make a good prediction regarding this parameters. A true validation of these results, including experimental validation of simulations of the entire collecting data was realistic.Biochemical oxygen demandChemical oxygen demandWastewaterSimulationParametersSymposium Proceedings