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FACTORS AFFECTING OXYGEN TRANSFER RATES IN HEADSPACE-GAS RESPIROMETERS

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Satisfactory measures of the biological oxygen uptake rate in headspace gas respirometers can only be achieved if the rate of oxygen transfer from the headspace gas to the liquid is greater than the rate of oxygen uptake by the microorganisms. In the authors' study, the potential factors affecting oxygen transfer limitations in headspace gas respirometers were evaluated quantitatively. Tests were conducted to measure the maximum oxygen uptake rates using a respirometer under various test combinations. Analysis of respirometric data indicated that limiting oxygen transfer rates were related to stirring rate, length of stirring bar, volume of sample, and oxygen content in the headspace gas. A multi-variable model was developed to describe the overall contribution of these factors to the limiting oxygen transfer rate using statistical procedures. This model can be used to estimate maximum oxygen transfer rates for essentially all headspace-gas respirometers.
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Document Type: Research Article

Publication date: 2002-01-01

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