A Standard for the Measurement of Oxygen Transfer in Clean Water
This standard was developed to measure the rate of oxygen tranfer from diffused gas and mechanical oxygenation devices to water. This test method is bsed upon removal of dissolved oxygen (DO) from the water folume by sodium sulfite followed by reoxygenation to near the saturation level. The DO inventory of the water volume is monitored during the reaeration period by measured DO concentrations at seveal points selected so that each point senses an equal tank volume. The data obtained at each determination point are analyzed by a simplified mass transfer model to estimate the apparent volumetric mass transfer coefficient and the saturation concentration. Various components and methods for measurement of gas rate and power consumption by the oxygenation device are given. Energy efficiency of the oxygenation device is evaluated as the mass rate of oxygen transferred per unit power consumed.
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