Oxygen-transfer efficiency of fine-pore diffused aeration systems: energy intensity as a unifying evaluation parameter
Abstract:Assessing the clean-water oxygen-transfer characteristics of aeration devices is a critical step in the design and operation of aeration systems for activated-sludge processes. A fundamental model has been developed for assessing the clean-water oxygen-transfer characteristics of fine-bubble (fine-pore) aeration devices. This model is based on a proposed fundamental parameter, energy intensity (EI ; kW/m3), which is the energy required to deliver air to the aerated volume per unit of aerated volume. The standard oxygen transfer rate (SOTR, g/m3 · s) is shown to be related to EI through a second-degree equation: SOTR = −11.5 EI 2 + 2.27 EI (r2 = 0.951). The model applies over a wide range of diffuser types, diffuser densities, tank dimensions, and specific air flows. The results suggest that opportunities for increasing oxygen-transfer efficiencies of fine-bubble aeration systems remain, particularly by reducing mean bubble sizes and reducing EI requirements.
Document Type: Research Article
Publication date: May 1, 1998
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