The diploma thesis presents the design of an experimental system for the aeration of experimental waste sludge. It is hypothesised that the acoustic signal in the liquid carries information about the air flow with which the liquid is aerated. The system is designed to analyse the effects on the aeration quality, using different measurement methods, in order to select the type of compressor that will provide the most energy efficient process. The system was used to aerate water and to analyse the effect of different nozzles on bubble formation, which was observed with a hydrophone and a combination of a laser and a photodiode. As part of the thesis work, we performed a verification of the hydrophone signal measurement and analysed the influence of the nozzles and air flow on the hydrophone signal and the formed bubbles. The results confirmed the hypothesis.
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