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Oxygen-transfer efficiency of fine-pore diffused aeration systems: energy intensity as a unifying evaluation parameter

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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 ยท 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.
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Keywords: ACTIVATED SLUDGE; AERATION; AERATOR TESTING; ENERGY INTENSITY; FINE-PORE DIFFUSERS; OXYGEN TRANSFER

Document Type: Research Article

Publication date: 1998-05-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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