Treatment of waste gas contaminated with dichloromethane using photocatalytic oxidation, biodegradation and their combinations
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Treatment of waste gas contaminated with dichloromethane using photocatalytic oxidation, biodegradation and their combinationsDate
2020-08-22Citation
F. Almomani, E.R. Rene, M.C. Veiga, R.R. Bhosale, C. Kennes, Treatment of waste gas contaminated with dichloromethane using photocatalytic oxidation, biodegradation and their combinations, J. Hazard. Mater. 405 (2021) 123735. https://doi.org/10.1016/j.jhazmat.2020.123735.
Abstract
[Abstract] The treatment of waste gas (WG) containing dichloromethane (DCM) using advanced oxidation processes (AOPs) [UV and UV-TiO2], 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 (Qgas), inlet DCM concentration ([DCM]i), residence time (τ), photocatalyst loading (PH-CL) and % relative humidity (% RH) on the AOPs performance and the removal of DCM (%DCMr) were studied and optimized. The UV process exhibited %DCMr ≤ 12.5 % for tests conducted at a [DCM]i ≤ 0.45 g/m3, Qgas of 0.12 m3/h and τ of 27.6 s, respectively, and < 4 % when the [DCM]i ≥ 4.2 g/m3. The UV-TiO2 achieved a %DCMr ≥ 71 ± 1.5 % at Qgas of 0.06 m3/h, [DCM]i of 0.45 g/m3, τ of 55.2 s, PH-CL of 10 g/m2, and %RH of 50, respectively. The BT process removed ∼97.6 % of DCM with an elimination capacity (EC) of 234.0 g/m3·h. Besides, the high %DCMr of ∼98.5 % in the UV-BT and 99.7 % in the UV-TiO2-BT processes confirms AOPs-BT as a promising technology for the treatment of recalcitrant compounds present in WG.
Keywords
Dichloromethane
Air pollution
Hydroxyl radicals
Photo-degradation
Stirred tank bioreactor
Process optimization
Air pollution
Hydroxyl radicals
Photo-degradation
Stirred tank bioreactor
Process optimization
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Rights
Atribución 3.0 España
ISSN
0304-3894