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Integrated bio-electrogenic process for bioelectricity production and cathodic nutrient recovery from azo dye wastewater

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  • Nagendranatha Reddy, C.
  • Venkata Mohan, S.

Abstract

Microbial electrochemical treatment (MET) process was designed to evaluate complete mineralization of partially treated dye effluent obtained from anoxically operated Periodic discontinuous batch reactor (PDBR) for simultaneous bioelectricity generation and recovery of nutrients. In MET bioreactor, anode and cathode chambers were fed with designed synthetic wastewater (DSW) and PDBR dye effluents. The dye metabolite (NH4+) will be converted to nitrates by the activity of aerobic biocatalyst present in cathode chamber to be used as biofertilizer. Dye removal of 90.2% was observed with good electrogenic activity (voltage (OCV)/current; 395 mV/1.77 mA). The mineralization of dye and its intermediates were assessed by reduction in overall toxicity from 23% to 4%. Chemical oxygen demand (COD) removal efficiency of 75% (anode) and 88% (cathode) were observed in correspondence to higher azoreductase (18.7 U; 48 h) and dehydrogenase (1.66 μg/ml of toluene; 24 h) enzyme activities which correlated well with metabolic activities of biocatalyst. Bioelectrocatalytic behavior of mixed biocatalyst on the basis of redox catalytic currents and prevalence of redox mediators signified the specific function of electron transfer toward dye mineralization. The results obtained suggest that the use of MET can considerably degrade toxic pollutants and provides nitrate rich solution (biofertilizer). Utilization of recovered nutrients directly to farms without any energy intensive methods is reported in this communication.

Suggested Citation

  • Nagendranatha Reddy, C. & Venkata Mohan, S., 2016. "Integrated bio-electrogenic process for bioelectricity production and cathodic nutrient recovery from azo dye wastewater," Renewable Energy, Elsevier, vol. 98(C), pages 188-196.
    • Handle: RePEc:eee:renene:v:98:y:2016:i:c:p:188-196
    DOI: 10.1016/j.renene.2016.03.047
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    1. Khandaker, Shahjalal & Bashar, M Mahbubul & Islam, Aminul & Hossain, Md. Tofazzal & Teo, Siow Hwa & Awual, Md. Rabiul, 2022. "Sustainable energy generation from textile biowaste and its challenges: A comprehensive review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).
    2. Yeruva, Dileep Kumar & Velvizhi, G. & Mohan, S. Venkata, 2016. "Coupling of aerobic/anoxic and bioelectrogenic processes for treatment of pharmaceutical wastewater associated with bioelectricity generation," Renewable Energy, Elsevier, vol. 98(C), pages 171-177.
    3. Hu, Jianjun & Zhang, Quanguo & Lee, Duu-Jong & Ngo, Huu Hao, 2018. "Feasible use of microbial fuel cells for pollution treatment," Renewable Energy, Elsevier, vol. 129(PB), pages 824-829.
    4. Modestra, J. Annie & Reddy, C. Nagendranatha & Krishna, K. Vamshi & Min, Booki & Mohan, S. Venkata, 2020. "Regulated surface potential impacts bioelectrogenic activity, interfacial electron transfer and microbial dynamics in microbial fuel cell," Renewable Energy, Elsevier, vol. 149(C), pages 424-434.
    5. Divya Priya, A. & Deva, Sharon & Shalini, P. & Pydi Setty, Y., 2020. "Antimony-tin based intermetallics supported on reduced graphene oxide as anode and MnO2@rGO as cathode electrode for the study of microbial fuel cell performance," Renewable Energy, Elsevier, vol. 150(C), pages 156-166.

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