A Standard for the Measurement of Oxygen Transfer in Clean Water
byOxygen Transfer Standards Committee of ASCE
American Society of Civil Engineers, New York, NY
978-0-87262-430-6 (ISBN-13) | 0-87262-430-7 (ISBN-10), 1984, Soft Cover, Pg. 46
Standard No.: ASCE 2-84
Out of Print: Not available at ASCE Bookstore.
Document Type: Book - Standard
Abstract:
This standard was developed to measure the rate of oxygen transfer from diffused gas and mechanical oxygenation devices to water. The standard is applicable to laboratory scale oxygenation devices with water volumes of a few gallons as well as to full scale systems with water volumes typical of those found in the activated sludge wastewater treatment process. It is intended that this standard be used in the preparation of specifications for compliance testing and in the development of performance information. This test method is based upon removal of dissolved oxygen (DO) from the water volume 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 measuring DO concentrations at several points selected so that each point senses an equal tank volume. The method specifies a minimum number, distribution and range of DO measurements at each point. 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. Nonlinear regression is employed to fit the model to the DO profile measured at each point during reoxygenation. Estimates are adjusted to standard conditions and the standard oxygen transfer rate is obtained. A procedure based on the clean water test results is recommended for estimation of oxygen transfer rates under process conditions. Various components of power consumption are defined 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.
Subject Headings: Oxygen transfer | Energy consumption | Water treatment | Water quality | Mass transfer | Dissolved oxygen | Water tanks
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