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TitleMagnetite nanoparticles enhance the bioelectrochemical treatment of municipal sewage by facilitating the syntrophic oxidation of volatile fatty acids
AbstractBACKGROUND: Microbial electrochemical technologies (METs) represent a novel platform to harvest the energy trapped in municipal wastewater. At the anode of METs, electro-active bacteria (EAB) anaerobically oxidize wastewater constituents using the electrode as the terminal electron acceptor and, by so doing, generate an electric current. To convert complex wastewater constituents into electricity, EAB must not only establish syntrophic relationships with other members of the microbial community, but also compete with methanogens for consumption of hydrogen and acetate. Here, we examined the addition of magnetite nanoparticles (NPs) (250 mg Fe L) as a novel strategy to manipulate such metabolic interactions and in turn maximize the efficiency of wastewater treatment and the yield of electric current generation. RESULTS: Batch experiments carried out either in the presence of a mixture of volatile fatty acids or of a synthetic sewage demonstrated that magnetite addition accelerate the rate of electrogenic oxidation of specific compounds, particularly propionate (up to 120%), an intermediate which frequently accumulates during anaerobic treatment processes, while correspondingly enhancing electric current generation (up to 90%), and diminishing the rate of competing methane generation (up to 50%). Notably, the composition of the microbial community was not substantially affected by the presence of magnetite nanoparticles, possibly suggesting that these latter facilitated extracellular electron transfer mechanisms (among microbes and with the electrode), rather than enriching conditions for specific microorganisms. CONCLUSION: The addition of magnetite NPs may represent a practical strategy to kick-start a bioelectrochemical system designed for wastewater treatment and improve the effectiveness of electrogenic substrate oxidation processes. © 2019 Society of Chemical Industry.
SourceJournal of chemical technology and biotechnology (1986) 94 (10), pp. 3134–3146
Keywordsbioanodesmagnetite nanoparticlespropionatesynthetic sewagesyntrophic oxidation
JournalJournal of chemical technology and biotechnology (1986)
EditorPublished for the Society of Chemical Industry by Blackwell Scientific Publications,, Oxford [Oxfordshire], Regno Unito
Year2019
TypeArticolo in rivista
DOI10.1002/jctb.6120
AuthorsCruz Viggi, Carolina; Casale, Stefania; Chouchane, Habib; Askri, Refka; Fazi, Stefano; Cherif, Ameur; Zeppilli, Marco; Aulenta, Federico
Text407386 2019 10.1002/jctb.6120 Scopus 2 s2.0 85068704746 bioanodes magnetite nanoparticles propionate synthetic sewage syntrophic oxidation Magnetite nanoparticles enhance the bioelectrochemical treatment of municipal sewage by facilitating the syntrophic oxidation of volatile fatty acids Cruz Viggi, Carolina; Casale, Stefania; Chouchane, Habib; Askri, Refka; Fazi, Stefano; Cherif, Ameur; Zeppilli, Marco; Aulenta, Federico Istituto di Ricerca sulle Acque, Italy; Universite de la Manouba; Universita degli Studi di Roma La Sapienza BACKGROUND Microbial electrochemical technologies METs represent a novel platform to harvest the energy trapped in municipal wastewater. At the anode of METs, electro active bacteria EAB anaerobically oxidize wastewater constituents using the electrode as the terminal electron acceptor and, by so doing, generate an electric current. To convert complex wastewater constituents into electricity, EAB must not only establish syntrophic relationships with other members of the microbial community, but also compete with methanogens for consumption of hydrogen and acetate. Here, we examined the addition of magnetite nanoparticles NPs 250 mg Fe L as a novel strategy to manipulate such metabolic interactions and in turn maximize the efficiency of wastewater treatment and the yield of electric current generation. RESULTS Batch experiments carried out either in the presence of a mixture of volatile fatty acids or of a synthetic sewage demonstrated that magnetite addition accelerate the rate of electrogenic oxidation of specific compounds, particularly propionate up to 120% , an intermediate which frequently accumulates during anaerobic treatment processes, while correspondingly enhancing electric current generation up to 90% , and diminishing the rate of competing methane generation up to 50% . Notably, the composition of the microbial community was not substantially affected by the presence of magnetite nanoparticles, possibly suggesting that these latter facilitated extracellular electron transfer mechanisms among microbes and with the electrode , rather than enriching conditions for specific microorganisms. CONCLUSION The addition of magnetite NPs may represent a practical strategy to kick start a bioelectrochemical system designed for wastewater treatment and improve the effectiveness of electrogenic substrate oxidation processes. © 2019 Society of Chemical Industry. 94 Published version http //www.scopus.com/record/display.url eid=2 s2.0 85068704746 origin=inward Articolo in rivista Published for the Society of Chemical Industry by Blackwell Scientific Publications, 0268 2575 Journal of chemical technology and biotechnology 1986 Journal of chemical technology and biotechnology 1986 J. chem. technol. biotechnol. 1986 Journal of chemical technology and biotechnology. 1986 stefano.fazi FAZI STEFANO federico.aulenta AULENTA FEDERICO carolina.cruzviggi CRUZ VIGGI CAROLINA