Degradation of recalcitrant textile azo-dyes by fenton-based process followed by biochar polishing - Archive ouverte HAL Access content directly
Journal Articles Journal of Environmental Science and Health, Part A Year : 2021

Degradation of recalcitrant textile azo-dyes by fenton-based process followed by biochar polishing

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Abstract

The use of advanced oxidative processes (AOPs) is an efficient alternative for the treatment of textile wastewaters. The aim of this study was to assess the dye removal efficiency of a Fenton-based degradation process followed by a polishing step using biochar prepared from rice husk. Six recalcitrant textile dyes - Reactive Red 195 (D1), Synolon Brown S2 (D2), Orange Remazol RGB (D3), Yellow Synozol K3 (D4), Reactive Orange (D5), and Reactive Black 5 (D6) – were treated with Fenton and photo-Fenton processes (with and without biochar polishing) under optimized conditions. The results showed a general efficiency ranking: photo-Fentonþbiochar Fentonþ biochar>photo-Fenton Fenton. The Fenton process was also efficient for the regeneration of the dye-saturated biochar. The photo-Fentonþbiochar process achieved the following color removal percentages: D1 (98.8%), D2 (99.7%), D3 (98.9%), D4 (96.3%), D5 (94.2%) and D6 (94.8%). This process was applied to a real conventionally-treated textile wastewater and analysis showed a reduction in BOD (87.5% degradation), COD (62.5% degradation) and color (93.5% mean removal). These results reveal the possibility for the reuse of the treated water for non-potable industrial uses, for example, floor washing or the cleaning of machines and toilet areas.
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Dates and versions

hal-03456552 , version 1 (30-11-2021)

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Ana Júlia Feuzer-Matos, Renan Testolin, Sylvie Cotelle, Eric Sanches-Simões, Wendell Pimentel-Almeida, et al.. Degradation of recalcitrant textile azo-dyes by fenton-based process followed by biochar polishing. Journal of Environmental Science and Health, Part A, 2021, 56 (9), pp.1019-1029. ⟨10.1080/10934529.2021.1959774⟩. ⟨hal-03456552⟩
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