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An experimental investigation of oily wastewater treatment in a bubble column humidifier using an improved method for measuring humidity

  • Bubble column humidifiers (BCHs) are frequently used for the humidification of air in various water treatment applications. A potential but not yet profoundly investigated application of such devices is the treatment of oily wastewater. To evaluate this application, the accumulation of an oil-water emulsion using a BCH is experimentally analyzed. The amount of evaporating water vapor can be evaluated by measuring the humidity ratio of the outlet air. However, humidity measurements are difficult in close to saturated conditions, as the formation of liquid droplets on the sensor impacts the measurement accuracy. We use a heating section after the humidifier, such that no liquid droplets are formed on the sensor. This enables us a more accurate humidity measurement. Two batch measurement runs are conducted with (1) tap water and (2) an oil-water emulsion as the respective liquid phase. The humidity measurement in high humidity conditions is highly accurate with an error margin of below 3 % and can be used to predict the oil concentration of the remaining liquid during operation. The measured humidity ratio corresponds with the removed amount of water vapor for both tap water and the accumulation of an oil-water emulsion. Our measurements show that the residual water content in the oil-water emulsion is below 4 %.

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Author:Elias Eder, Florian Stemer, Dieter Brüggemann, Markus PreißingerORCiD
Parent Title (English):Heat Powered Cycles Conference. University of the Basque Country, Bilbao, Spain. 10th-13th April 2022. Conference Proceedings
Publisher:Heat Powered Cycles
Place of publication:o.O.
Editor:Roger Riehl
Document Type:Conference Proceeding
Year of publication:2022
Release Date:2022/07/26
First Page:37
Last Page:45
Organisationseinheit:Forschung / Forschungszentrum Energie
DDC classes:600 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften und Maschinenbau / 624 Ingenieurbau und Umwelttechnik
Open Access?:ja
Peer review:wiss. Beitrag, peer-reviewed
Publicationlist:Preißinger, Markus
Eder, Elias
Licence (German):License LogoCreative Commons - CC BY - International - Attribution- Namensnennung 4.0