NDLI: Azo dye wastewater treatment in a bioelectrochemical-aerobic integrated system: effect of initial azo dye concentration and aerobic sludge concentration

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Azo dye wastewater treatment in a bioelectrochemical-aerobic integrated system: effect of initial azo dye concentration and aerobic sludge concentration

Content Provider	Semantic Scholar
Author	Cui, Minhua Gao, Jian Wang, Aijie Sangeetha, Thangavel
Copyright Year	2019
Abstract	An integrated system that consisted of a bioelectrochemical reactor (BER) and an aerobic completely stirred tank reactor (ACSTR) was constructed to treat simulated wastewater mixed with azo dye Acid Orange 7 (AO7) and real municipal wastewater. It was found that AO7 could be efficiently decolorized in BER within 6 h while initial concentration fluctuated from 25 to 100 mg/L. With an initial AO7 concentration of 75 mg/L, BER reached a decolorization efficiency of 93.65±2.45% at 6 h and contributed 26.56±8.91% of chemical oxygen demand (COD) removal. Coulombic efficiency (CE) of current generation varied from 23.19±6.96 to 37.23±3.48% and CE for AO7 decolorization decreased from 30.45±3.19 to 14.59±1.21% at the initial AO7 concentration of 50 mg/L, which illustrated the important contribution of electrochemical reduction on AO7 decolorization. The effluent of BERs can be subsequently refined by ACSTR, the residual COD was 72±10 mg/L after 6 h treatment with an activated sludge concentration of 6000 mg/L. Further increasing the sludge concentration to 9000 mg/L, final COD concentration decreased to 62±7 mg/L. Results showed that the bioelectrochemical-aerobic integrated system effectively treated the mixed azo dye containing wastewater.
Starting Page	314
Ending Page	320
Page Count	7
File Format	PDF HTM / HTML
DOI	10.5004/dwt.2019.24395
Volume Number	165
Alternate Webpage(s)	http://www.deswater.com/DWT_articles/vol_165_papers/165_2019_314.pdf
Alternate Webpage(s)	https://doi.org/10.5004/dwt.2019.24395
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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