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Article

Removal of Dissolved Oxygen from Water by Nitrogen Stripping Coupled with Vacuum Degassing in a Rotor–Stator Reactor

1
Clean Utilization Research Institute, China Coal Energy Research Institute Co., Ltd., Xi’an 710054, China
2
Research Center of the Ministry of Education for High Gravity Engineering and Technology, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
3
Department of Chemical & Process Engineering, Moi University, Eldoret 3900, Kenya
*
Author to whom correspondence should be addressed.
Academic Editors: Elio Santacesaria, Riccardo Tesser and Vincenzo Russo
Processes 2021, 9(8), 1354; https://doi.org/10.3390/pr9081354
Received: 8 June 2021 / Revised: 29 July 2021 / Accepted: 30 July 2021 / Published: 1 August 2021
Oxygen is a harmful substance in many processes because it can bring out corrosion and oxidation of food. This study aimed to enhance the removal of dissolved oxygen (DO) from water by employing a novel rotor–stator reactor (RSR). The effectiveness of the nitrogen stripping coupled with vacuum degassing technique for the removal of DO from water in the RSR was investigated. The deoxygenation efficiency (η) and the mass transfer coefficient (KLa) were determined under various operating conditions for the rotational speed, liquid volumetric flow rate, gas volumetric flow rate, and vacuum degree. The nitrogen stripping coupled with vacuum degassing technique achieved values for η and KLa of 97.34% and 0.0882 s−1, respectively, which are much higher than those achieved with the vacuum degassing technique alone (η = 89.95% and KLa = 0.0585 s−1). A correlation to predict the KLa was established and the predicted KLa values were in agreement with the experimental values, with deviations generally within 20%. The results indicate that RSR is a promising deaerator thanks to its intensification of gas–liquid contact. View Full-Text
Keywords: deoxygenation efficiency; vacuum–N2–H2O–O2 system; rotor–stator reactor; mass transfer; correlation deoxygenation efficiency; vacuum–N2–H2O–O2 system; rotor–stator reactor; mass transfer; correlation
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MDPI and ACS Style

Zhao, Z.; Liu, Z.; Xiang, Y.; Arowo, M.; Shao, L. Removal of Dissolved Oxygen from Water by Nitrogen Stripping Coupled with Vacuum Degassing in a Rotor–Stator Reactor. Processes 2021, 9, 1354. https://doi.org/10.3390/pr9081354

AMA Style

Zhao Z, Liu Z, Xiang Y, Arowo M, Shao L. Removal of Dissolved Oxygen from Water by Nitrogen Stripping Coupled with Vacuum Degassing in a Rotor–Stator Reactor. Processes. 2021; 9(8):1354. https://doi.org/10.3390/pr9081354

Chicago/Turabian Style

Zhao, Zemeng, Zhibang Liu, Yang Xiang, Moses Arowo, and Lei Shao. 2021. "Removal of Dissolved Oxygen from Water by Nitrogen Stripping Coupled with Vacuum Degassing in a Rotor–Stator Reactor" Processes 9, no. 8: 1354. https://doi.org/10.3390/pr9081354

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