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1. Radiotracer testsRadiotracer Br-82 as aqueous potassium bromide (K 82 Br) with an activity 2 GBq was used astracer for investigation of various units of WWTP. The radiotracer was injected instantaneously(Fig.39). Four signals (input, output and two signals from detectors immersed in water, located onbridge of scraper) for the clarifier and two in the aeration tank were registered by the multipointmeasuring system Minekin 9301. The step of time discretization was 1 min per channel.2. Results(a) Primary clarifierThe experimental RTD curve obtained at the output of the primary clarifier (probe D4) and itsmodel are shown in Fig. 40.The RTD software package (DTS PRO version 4.20) was used for treatment and modeling ofthe experimental data. Fig. 41 shows the selected model of primary clarifier, which fits better with theexperimental RTD curve (Fig. 40).FIG.38. Design of aeration tank, D1-D2 – radiation detectors.FIG.39. Radiotracer injection in the primary clarifier.45