Journal
DESALINATION AND WATER TREATMENT
Volume 153, Issue -, Pages 112-120Publisher
DESALINATION PUBL
DOI: 10.5004/dwt.2019.24003
Keywords
Azo dye wastewater; Microbial fuel cell; Model; Sulfate
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Funding
- Provincial Natural Science Foundation of Jiangsu, China [BK20171351]
- National Natural Science Foundation of China [21277024]
- Fundamental Research Funds for the Central Universities [2242016K41042]
- Scientific Research Foundation of Graduate School of Southeast University
- JSPS KAKENHI [JP16H02747]
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This study investigated the effects of a microbial fuel cell (MFC) on the simultaneous decolorization and desulfurization of azo dye wastewater. It showed that the conversion of sulfur at the anode had a significant effect on electricity generation and decolorization. After adding 800 mg/L sulfate, the active brilliant red X-3B (ABRX3) concentration in the effluent decreased from 208 to 67 mg/L and the maximum power density output increased by 20%. To quantify the reaction processes, a kinetics model based on a one-dimensional biofilm was developed. It showed that sulfur ions had a direct decolorization effect on ABRX3. The reaction of sulfide and ABRX3 at the anode was a first-order reaction. The decolorization and desulfurization mechanisms were validated by analyzing the microbial community at the anode. Sulfate-reducing bacteria (SRB) on the anode fermented the lactate to acetate. Then, electrogenic Geobacter used the acetate produced as a carbon source for electricity generation. The sulfide produced by SRB acted as additional fuel and a reductant and promoted the current generation and the reduction of azo bonds in the azo dye. Hence, the MFC showed potential for treating industrial textile wastewater.
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