Dissolved oxygen transfer using flat and curves paddle-wheel on a mechanical aerator
DOI:
https://doi.org/10.15665/rp.v19i1.2527Keywords:
Mechanical aerator, dissolved oxygen (DO), oxygen transfer coefficient, standard aeration efficiency, Paddle-wheel geometryAbstract
In this work, the implementation of two types of blades in a prototype of horizontal axis mechanical aeration was analyzed, starting from the dissolved oxygen (DO) transfer analysis. Measurements were made in anoxic water samples, using two types of paddle-wheels with the same area and impact angle, but with a different curvature. The data obtained show that the two types of paddle-wheels have the same standard aeration efficiency (SAE) in both devices, obtaining a value of 0.50 kgO2/kWh. However, the standard oxygen transfer rate (SOTR) for the flat paddle-wheel aerator was 34.9% higher than that obtained with curved paddle-wheels. The KLa values presented values of 2.61 h-1 for the flat paddle-wheels aerator and 1.94 h-1 for the curved paddle-wheel, reflecting a lower oxygen transfer rate for the latter. However, the energy consumption is lower when curved paddle-wheels are implemented, demonstrating the importance of these parameters during the design of aerator systems. The results of this study contribute to the improvement of mechanical aerators, reducing the energy consumption associated with oxygenation processes.
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