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- In relation to this article, we declare that there is no conflict of interest.
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Received April 12, 2023
Accepted July 18, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Azo Dye Decolorization in Sole Biocatalyzed Electrolysis System (BES) and Coupled with Anaerobic Sequencing Batch Reactor (ASBR-BES) in Operation with Ideal Synthetic Wastewater and Domestic Wastewater
Abstract
In practice, various waste streams may be available to drive biocatalyzed electrolysis systems (BESs) for azo dyes decolorization,
which can aff ect how BES is employed to achieve superior performance. This work examined the performance of BES
and coupling it with an anaerobic sequencing batch reactor (ASBR-BES) in operation with ideal synthetic wastewater (SW)
and domestic wastewater (DW) to remove acid orange 7 (AO7). Within 10 h, ASBR-BES-SW showed an acceptable AO7
removal effi ciency (94% ± 0.6%) higher than BES-SW. However, in applying DW, BES achieved 5.3% higher decolorization
effi ciency compared to ASBR-BES (79.3% ± 0.7%) in 26 h, which was enhanced to 95.5% ± 0.4% by reducing the electrode
spacing to 1 cm. Higher reductant usage ratio and more residual chemical oxygen demand were achieved in SW than DW.
Coulombic effi ciencies on AO7 reduction and COD oxidation were evaluated to investigate the contribution of removal
processes. Also, variations of electrical conductivity, temperature, pH, and current density during a cycle were examined.
