Implementación del modelo de lodos activados NO1 usando diagramas de bloques y validación con un reactor biológico de lodos activos mezcla completa a escala piloto

Abstract

WWTP (wastewater plant) simulation programs are a very important tool for evaluating their behavior and effectiveness. For this work, the MatLab software and its Simulink tool were used, which allows solving differential equations using block diagrams. A system of 13 differential equations corresponding to Activated Sludge Model No. 1 (ASM1) was solved, which represents the dynamics of the activated sludge process within a reactor, this model needs some variables that were determined by sampling and analysis tests in a pilot scale reactor, which are: Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Suspended Volatile Solids (SSV), Total Suspended Solids (TSS), Kjeldahl nitrogen, nitrites and nitrates. To validate the model developed in Simulink, a discontinuous stirred tank reactor was built where the activated sludge process will be carried out for the treatment of residual water. When taking samples, first the pH was stabilized, then daily samples were taken to measure the variables of the ASM1 model; With these results, the data generated in the simulations were compared using the coefficient of determination R2. In most of the variables analyzed there was a favorable relationship between the simulated data and the data obtained by samples, the COD had a relation of 97%, the soluble COD 99%, Ammonia nitrogen 89%, the Kjeldahl nitrogen 44%, this shows the high degree of similarity in these variables, except in volatile suspended solids where the degree of relationship was only 4% and a relationship was found between some default values and this error.