Treatment of waste gas contaminated with dichloromethane using photocatalytic oxidation, biodegradation and their combinations
<p dir="ltr">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 c...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , , , |
| منشور في: |
2021
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| الموضوعات: | |
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| الملخص: | <p dir="ltr">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 (Q<sub>gas</sub>), inlet DCM concentration ([DCM]<sub>i</sub>), residence time (τ), photocatalyst loading (PH-C<sub>L</sub>) and % relative humidity (% RH) on the AOPs performance and the removal of DCM (�M<sub>r</sub>) were studied and optimized. The UV process exhibited �M<sub>r</sub> ≤ 12.5 % for tests conducted at a [DCM]<sub>i</sub> ≤ 0.45 g/m<sup>3</sup>, Q<sub>gas</sub> of 0.12 m<sup>3</sup>/h and τ of 27.6 s, respectively, and < 4 % when the [DCM]<sub>i</sub> ≥ 4.2 g/m<sup>3</sup>. The UV-TiO<sub>2</sub> achieved a �M<sub>r</sub> ≥ 71 ± 1.5 % at Q<sub>gas</sub> of 0.06 m<sup>3</sup>/h, [DCM]<sub>i</sub> of 0.45 g/m<sup>3</sup>, τ of 55.2 s, PH-C<sub>L</sub> of 10 g/m<sup>2</sup>, and %RH of 50, respectively. The BT process removed ∼97.6 % of DCM with an elimination capacity (EC) of 234.0 g/m<sup>3</sup>·h. Besides, the high �M<sub>r</sub> of ∼98.5 % in the UV-BT and 99.7 % in the UV-TiO<sub>2</sub>-BT processes confirms AOPs-BT as a promising technology for the treatment of recalcitrant compounds present in WG.</p><h2>Other Information</h2><p dir="ltr">Published in: Journal of Hazardous Materials<br>License: <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank">http://creativecommons.org/licenses/by/4.0/</a><br>See article on publisher's website: <a href="https://dx.doi.org/10.1016/j.jhazmat.2020.123735" target="_blank">https://dx.doi.org/10.1016/j.jhazmat.2020.123735</a></p> |
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