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An experimental study of oily wastewater treatment in a humidification–dehumidification system with bubble column humidifier

  • Vast amounts of oily wastewater are byproducts of the petrochemical and the shipping industry and to this day frequently discharged into water bodies either without or after insufficient treatment. To alleviate the resulting pollution, water treatment processes are in great demand. Bubble column humidifiers (BCHs) as part of humidification–dehumidification systems are predestined for such a task, since they are insensitive to different feed liquids, simple in design and have low maintenance requirements. While humidification in a bubble column has been investigated plentiful for desalination, a systematic investigation of oily wastewater treatment is missing in literature. We filled this gap by analyzing the treatment of an oil–water emulsion experimentally to derive recommendations for future design and operation of BCHs. Our humidity measurements indicate that the air stream is always saturated after humidification for a liquid height of only 10 cm. A residual water mass fraction of 3.5 wt% is measured after a batch run of six hours. Furthermore, continuous measurements show that an increase in oil mass fraction leads to a decrease in system productivity especially for high oil mass fractions. This decrease is caused by the heterogeneity of the liquid temperature profile. A lower liquid height mitigates this heterogeneity, therefore decreasing the heat demand and improving the overall efficiency. The oil content of the produced condensate is below 15 ppm, allowing discharge into various water bodies. The results of our systematic investigation prove suitability and indicate a strong future potential for the use of BCHs in oily wastewater treatment.

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Metadaten
Author:Elias Eder, Michael Cordin, Tung Pham, Dieter Brüggemann, Markus PreißingerORCiD
DOI:https://doi.org/10.1016/j.tsep.2022.101578
ISSN:2451-9049
Parent Title (English):Thermal Science and Engineering Progress
Document Type:Article
Language:English
Year of publication:2023
Release Date:2022/12/16
Tag:Bubble Column Humidifier; Humidification–dehumidification; Open-Air Open-Water
Volume:37
Article Number:101578
Number of pages:9
First Page:1
Last Page:9
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