Many clean water tests with the well known absorption method using sodium sulphite for deoxynation have shown that there are problems connected with solving these chemicals. Because of this, a new test method was developed at the Darmstadt University of Technology to determine oxygen transfer rates fine bubble aeration systems without sodium sulphite and a cobalt catalyst. The new method is called “Pure oxygen desorption method”. Contrary to the absorption method, the oxygen concentration in the test tank is increased well above the normal oxygen saturation concentration. This high excess concentration is obtained by feeding pure oxygen into the main pipe of the fine bubble aeration system. After starting normal aeration, the oxygen concentration in the clean water decreases towards the oxygen saturation concentration by stripping of the excess oxygen. The desorption curve is used to calculate the parameter aeration coefficient kLa and oxygen saturation concentration under process conditions c∞*. In comparison to the absorption method with sodium sulphite, the pure oxygen desorption method is a simple and cost-effective method for determining oxygen transfer rates.
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Research Article|
August 01 1998
Pure oxygen desorption method - a new and cost-effective method for the determination of oxygen transfer rates in clean water
Martin R. Wagner;
Martin R. Wagner
*Institut WAR, Water Supply, Wastewater Technology, Solid Waste Technology, Regional and Environmental Planning, Darmstadt University of Technology, Petersenstr. 13, D-64287 Darmstadt, Germany
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H. Johannes Poöpel;
H. Johannes Poöpel
*Institut WAR, Water Supply, Wastewater Technology, Solid Waste Technology, Regional and Environmental Planning, Darmstadt University of Technology, Petersenstr. 13, D-64287 Darmstadt, Germany
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Peter Kalte
Peter Kalte
**Dr Dahlem Consulting Engineers, Platz der deutschen Einheit, D-64293 Darmstadt, Germany
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Water Sci Technol (1998) 38 (3): 103–109.
Citation
Martin R. Wagner, H. Johannes Poöpel, Peter Kalte; Pure oxygen desorption method - a new and cost-effective method for the determination of oxygen transfer rates in clean water. Water Sci Technol 1 August 1998; 38 (3): 103–109. doi: https://doi.org/10.2166/wst.1998.0186
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