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

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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.

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

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/106143098X124957

Publication date: May 1, 1998

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  • 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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