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Cathodic selenium recovery in bioelectrochemical system: Regulatory influence on anodic electrogenic activity.
J Hazard Mater. 2020 11 15; 399:122843.JH

Abstract

Metal(loid)s are used in various industrial activities and widely spread across the environmental settings in various forms and concentrations. Extended releases of metal(loid)s above the regulatory levels cause environmental and health hazards disturbing the ecological balance. Innovative processes for treating the metal(loid)-contaminated sites and recovery of metal(loid)s from disposed waste streams employing biotechnological routes provide a sustainable way forward. Conventional metal recovery technologies demand high energy and/or resource inputs, which are either uneconomic or unsustainable. Microbial electrochemical systems are promising for removal and recovery of metal(loid)s from metal(loid)-laden wastewaters. In this communication, a bioelectrochemical system (BES) was designed and operated with selenium (Se) oxyanion at varied concentrations as terminal electron acceptor (TEA) for reduction of selenite (Se4+) to elemental selenium (Se0) in the abiotic cathode chamber. The influence of varied concentrations of Se4+ towards Se0 recovery at the cathode was also evaluated for its regulatory role on the electrometabolism of anode-respiring bacteria. This study observed 26.4% Se0 recovery (cathode; selenite removal efficiency: 73.6%) along with organic substrate degradation of 74% (anode). With increase in the initial selenite concentration, there was a proportional increase in the dehydrogenase activity. Bioelectrochemical characterization depicted increased anodic electrogenic performance with the influence of varied Se4+ concentrations as TEA and resulted in a maximum power density of 0.034 W/m2. The selenite reduction (cathode) was evaluated through spectroscopic, compositional and structural analysis. X-ray diffraction and Raman spectroscopy showed the amorphous nature, while Energy Dispersive X-ray spectroscopy confirmed precipitates of the deposited Se0 recovered from the cathode chamber. Scanning electron microscopic images clearly depicted the Se0 depositions (spherical shaped; sized approximately 200 nm in diameter) on the electrode and cathode chamber. This study showed the potential of BES in converting soluble Se4+ to insoluble Se0 at the abiotic cathode for metal recovery.

Authors+Show Affiliations

Bioengineering and Environmental Sciences Lab, Department of Energy and Environmental Engineering (DEEE), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) campus, Hyderabad 500007, India.Water and Steam Chemistry Division, Chemistry Group, Bhabha Atomic Research Centre, Kalpakkam 603102, Tamil Nadu, India; Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India.UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA Delft, the Netherlands.Bioengineering and Environmental Sciences Lab, Department of Energy and Environmental Engineering (DEEE), CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India; Academy of Scientific and Innovative Research (AcSIR), CSIR-Indian Institute of Chemical Technology (CSIR-IICT) campus, Hyderabad 500007, India. Electronic address: svmohan@iict.res.in.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

32937693

Citation

Sravan, J Shanthi, et al. "Cathodic Selenium Recovery in Bioelectrochemical System: Regulatory Influence On Anodic Electrogenic Activity." Journal of Hazardous Materials, vol. 399, 2020, p. 122843.
Sravan JS, Nancharaiah YV, Lens PNL, et al. Cathodic selenium recovery in bioelectrochemical system: Regulatory influence on anodic electrogenic activity. J Hazard Mater. 2020;399:122843.
Sravan, J. S., Nancharaiah, Y. V., Lens, P. N. L., & Mohan, S. V. (2020). Cathodic selenium recovery in bioelectrochemical system: Regulatory influence on anodic electrogenic activity. Journal of Hazardous Materials, 399, 122843. https://doi.org/10.1016/j.jhazmat.2020.122843
Sravan JS, et al. Cathodic Selenium Recovery in Bioelectrochemical System: Regulatory Influence On Anodic Electrogenic Activity. J Hazard Mater. 2020 11 15;399:122843. PubMed PMID: 32937693.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cathodic selenium recovery in bioelectrochemical system: Regulatory influence on anodic electrogenic activity. AU - Sravan,J Shanthi, AU - Nancharaiah,Y V, AU - Lens,P N L, AU - Mohan,S Venkata, Y1 - 2020/05/18/ PY - 2020/01/20/received PY - 2020/04/19/revised PY - 2020/04/30/accepted PY - 2020/9/17/entrez PY - 2020/9/18/pubmed PY - 2021/5/15/medline KW - Bio-mineralization KW - Bioelectro-reduction KW - Bioremediation KW - Electron acceptor KW - Microbial fuel cell (MFC) KW - Resource recovery SP - 122843 EP - 122843 JF - Journal of hazardous materials JO - J Hazard Mater VL - 399 N2 - Metal(loid)s are used in various industrial activities and widely spread across the environmental settings in various forms and concentrations. Extended releases of metal(loid)s above the regulatory levels cause environmental and health hazards disturbing the ecological balance. Innovative processes for treating the metal(loid)-contaminated sites and recovery of metal(loid)s from disposed waste streams employing biotechnological routes provide a sustainable way forward. Conventional metal recovery technologies demand high energy and/or resource inputs, which are either uneconomic or unsustainable. Microbial electrochemical systems are promising for removal and recovery of metal(loid)s from metal(loid)-laden wastewaters. In this communication, a bioelectrochemical system (BES) was designed and operated with selenium (Se) oxyanion at varied concentrations as terminal electron acceptor (TEA) for reduction of selenite (Se4+) to elemental selenium (Se0) in the abiotic cathode chamber. The influence of varied concentrations of Se4+ towards Se0 recovery at the cathode was also evaluated for its regulatory role on the electrometabolism of anode-respiring bacteria. This study observed 26.4% Se0 recovery (cathode; selenite removal efficiency: 73.6%) along with organic substrate degradation of 74% (anode). With increase in the initial selenite concentration, there was a proportional increase in the dehydrogenase activity. Bioelectrochemical characterization depicted increased anodic electrogenic performance with the influence of varied Se4+ concentrations as TEA and resulted in a maximum power density of 0.034 W/m2. The selenite reduction (cathode) was evaluated through spectroscopic, compositional and structural analysis. X-ray diffraction and Raman spectroscopy showed the amorphous nature, while Energy Dispersive X-ray spectroscopy confirmed precipitates of the deposited Se0 recovered from the cathode chamber. Scanning electron microscopic images clearly depicted the Se0 depositions (spherical shaped; sized approximately 200 nm in diameter) on the electrode and cathode chamber. This study showed the potential of BES in converting soluble Se4+ to insoluble Se0 at the abiotic cathode for metal recovery. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/32937693/Cathodic_selenium_recovery_in_bioelectrochemical_system:_Regulatory_influence_on_anodic_electrogenic_activity_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(20)30832-3 DB - PRIME DP - Unbound Medicine ER -
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