Results of the mathematical simulation of wastewater treatment processes in aeration tanks at the Samara Municipal Wastewater Treatment Facilities during the upgrade and commissioning

Summary

The results of mathematical simulation of the operation of the existing biological wastewater treatment facilities using POTENTIAL software that was used for 10 months to optimize the operation of aeration tanks during the upgrade and commissioning are presented. The data on the quantitative and qualitative composition of wastewater supplied to the aeration tanks adopted in the project are compared with the actual data for the period 2023–2024. Calculation of the actual values of the growth and aerobic age of the activated sludge using the formulas included into the POTENTIAL software showed that the sustained required quality of the effluent in relation to ammonium and nitrites was observed with an aerobic age of activated sludge of 24.1–27 days and a wastewater temperature of 19.1–24.8°C, provided the concentration of N–NH₄ was less than 1 mg/l, and N–NO2 was less than 0.1 mg/l. As a result of calibration and verification of the mathematical model embedded in POTENTIAL software, the values of kinetic constants and coefficients were selected for a separate process line «aeration tank No. 7 – secondary settling tank No. 5» resulting in predicting the operation of the aeration tanks with a high degree of accuracy (deviations between the calculated and actual data were less than 8%).

Key words

wastewater , kinetic constants , mathematic modelling , NII VODGEO/SamGTU methodology , calculation of aeration tanks , ASM2d model , formulas of enzymatic kinetics , biological removal of nitrogen and phosphorus from wastewater