Nitrogenated Substrate Removal Modeling in Sequencing Batch Reactor Oxic-Anoxic Phases

In this paper, modified dynamic models of those used for traditional activated-sludge systems are proposed by adapting the oxic-anoxic phases to the sequencing batch reactor (SBR), where the nitrification-denitrification biochemical processes occur. The modification of Activated-Sludge Model 1 (ASM 1) to adapt to the operation performance of a sequencing batch reactor in the oxic-anoxic phases has yielded as results mathematical equations that allow estimation of the concentration of the removed nitrogenated forms such as ammonium and nitrate in the aeration and anoxic phases of the SBR. It is found that the determination coefficient ($R^2$) and $R^2$-adjusted trends vary from a qualified statistical adjustment ranging from good to excellent. It has been found that the estimated values of average saturation coefficients $K_{{\mathrm{NO}}_3}$, $K_{{\mathrm{O}}_{\text{2H}}}$, $K_{{\mathrm{NH}}_{\text{4AUT}}}$, and $K_{{\mathrm{O}}_{\text{2AUT}}}$ have the most influence in the estimation of the removed ${\mathrm{NO}}_3^{-}$ and ${\mathrm{NH}}_4^{+}$ concentrations in both oxic and anoxic phases of a SBR.