Application of Dynamic Simulations for Assessment of Urban Wastewater Systems Operation

I. Pijáková and J. Derco

Abstract
The paper presents the results of a study aimed at the use of simple mathematical models of a sewer network, wastewater treatment plant (WWTP) and receiving water to control the discharge of diluted wastewater from combined sewer overflow system in order to protect water resources. The greatest burden on the receiving water usually occurs at the time of combined sewer system overflow, when diluted municipal wastewater is also discharged into the receiving water. Literature usually presents impact assessment results of either wastewater treatment plants or sewer system on the receiving water. In our work, we assess the impact of the integrated municipal wastewater system on the receiving water. The models for the sewer system, wastewater treatment plant, and receiving water under consideration were developed. Mathematical modelling of the subsystems of urban wastewater system was carried out using simulator SIMBA 6. Simulations were performed using real experimental data. Information about the sewer system overflow during the year (total amount of overflow, pollutant load of COD during overflow) was obtained by using dynamic simulations. The simulation results aimed at the impact assessment of the sewer system overflow and WWTP on the receiving water quality showed that the values of the monitored parameters in the river could exceed several times the environmental quality standards for receiving water.

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Keywords
combined sewer overflows, impact on receiving water, modelling, receiving water, urban wastewater systems, wastewater treatment plant