In-situ Measured Velocity In the Secodary Settling Tank and Its Application for the Flow Simulation

Wastewater treatment process consists of several steps. Separation of sludge from water is one of the essential. Correct design of the settling tanks is therefore crucial for its operation. In case that these objects don’t work properly, they cause problems in the whole ecosystem as they lead to the increased load to the recipients. In this paper proper data collecting method is investigated and data collection is described. Actual point velocity of flow in the secondary settling tank was measured in several points throughout the tank. Measurement was carried out in WWTP Dolný Kubín and WWTP Nižná nad Oravou in Slovakia and these data are used for model calibration and verification. Consequently, simulation of the flow in the tank will be provided. Modelling of the flow in this type of conditions is difficult therefore it is necessary to find right tool to perform precise work. Data that were obtained by measurement have been supplemented by the data provided by the operation of the WWTP.