Treatment of waste gas contaminated with dichloromethane using photocatalytic oxidation, biodegradation and their combinations.

Autor: Almomani F; Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar. Electronic address: falmomani@qu.edu.qa., Rene ER; Chemical Engineering Laboratory, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of La Coruña (UDC), E-15008, La Coruña, Spain; IHE Delft Institute for Water Education, Department of Water Supply, Sanitation and Environmental Engineering, P. O. Box 3015, 2601 DA, Delft, the Netherlands., Veiga MC; Chemical Engineering Laboratory, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of La Coruña (UDC), E-15008, La Coruña, Spain., Bhosale RR; Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar., Kennes C; Chemical Engineering Laboratory, Faculty of Sciences and Center for Advanced Scientific Research (CICA), University of La Coruña (UDC), E-15008, La Coruña, Spain.
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2021 Mar 05; Vol. 405, pp. 123735. Date of Electronic Publication: 2020 Aug 22.
DOI: 10.1016/j.jhazmat.2020.123735
Abstrakt: The treatment of waste gas (WG) containing dichloromethane (DCM) using advanced oxidation processes (AOPs) [UV and UV-TiO 2 ], biological treatment (BT), and their combination (AOPs-BT) was tested. AOP tests were performed in an annular photo-reactor (APHR), while BT was conducted in a continuous stirred tank bioreactor (CSTBR). The effects of gas flow rate (Q gas ), inlet DCM concentration ([DCM] i ), residence time (τ), photocatalyst loading (PH-C L ) and % relative humidity (% RH) on the AOPs performance and the removal of DCM (%DCM r ) were studied and optimized. The UV process exhibited %DCM r ≤ 12.5 % for tests conducted at a [DCM] i ≤ 0.45 g/m 3 , Q gas of 0.12 m 3 /h and τ of 27.6 s, respectively, and < 4 % when the [DCM] i ≥ 4.2 g/m 3 . The UV-TiO 2 achieved a %DCM r ≥ 71 ± 1.5 % at Q gas of 0.06 m 3 /h, [DCM] i of 0.45 g/m 3 , τ of 55.2 s, PH-C L of 10 g/m 2 , and %RH of 50, respectively. The BT process removed ∼97.6 % of DCM with an elimination capacity (EC) of 234.0 g/m 3 ·h. Besides, the high %DCM r of ∼98.5 % in the UV-BT and 99.7 % in the UV-TiO 2 -BT processes confirms AOPs-BT as a promising technology for the treatment of recalcitrant compounds present in WG.
(Copyright © 2020 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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