Abstract
The treatment of single and binary azo dyes, as well as the effect of the circuit connection, aeration, and plant on the performance of UFCW-MFC, were explored in this study. The decolorization efficiency of Remazol Yellow FG (RY) (single dye: 98.2 %; binary dye: 92.3 %) was higher than Reactive Black 5 (RB5) (single: 92.3 %; binary: 86.7 %), which could be due to monoazo dye (RY) requiring fewer electrons to break the azo bond compared to the diazo dye (RB5). In contrast, the higher decolorization rate of RB5 in binary dye indicated the removal rate was affected by the electron-withdrawing groups in the dye structure. The closed circuit enhanced about 2% of color and 4% of COD removal. Aeration improved the COD removal by 6%, which could be contributed by the mineralization of intermediates. The toxicity of azo dyes was reduced by 11–26% and the degradation pathways were proposed. The dye removal by the plants was increased with a higher contact time. RB5 was more favorable to be uptook by the plant as RB5 holds a higher partial positive charge. 127.39 (RY), 125.82 (RB5), and 58.66 mW/m3 (binary) of maximum power density were generated. The lower power production in treating the binary dye could be due to more electrons being utilized for the degradation of higher dye concentration. Overall, the UFCW-MFC operated in a closed circuit, aerated, and planted conditions achieved the optimum performance in treating binary azo dyes containing wastewater (dye: 87–92%; COD: 91%) compared to the other conditions (dye: 83–92%; COD: 78–87%).
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This research was supported by the Fundamental Research Grant Scheme (FRGS/1/2019/TK10/UNIMAP/02/14) provided by the Ministry of Higher Education, Malaysia.
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Tean-Peng Teoh: conceptualization, methodology, formal analysis, investigation, writing—original draft preparation; Soon-An Ong: supervision, conceptualization, writing—review and editing, funding acquisition; Li-Ngee Ho: resources; Yee-Shian Wong: resources; Nabilah Aminah Lutpi: resources; Yoong-Ling Oon: methodology, visualization; Sing-Mei Tan: conceptualization, methodology; Yong-Por Ong: validation, visualization; Kea-Lee Yap: validation.
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Teoh, TP., Ong, SA., Ho, LN. et al. Insights into the decolorization of mono and diazo dyes in single and binary dyes containing wastewater and electricity generation in up-flow constructed wetland coupled microbial fuel cell. Environ Sci Pollut Res 30, 17546–17563 (2023). https://doi.org/10.1007/s11356-022-23101-w
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DOI: https://doi.org/10.1007/s11356-022-23101-w