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Article ; Online: Novel electrochemical strategies for the microbial conversion of CO

Llorente, María / Tejedor-Sanz, Sara / Berná, Antonio / Manchón, Carlos / Esteve-Núñez, Abraham

2024 Volume 17, Issue 1, Page(s) e14383

Abstract: Microbial electrosynthesis (MES) constitutes a bioelectrochemical process where bacteria uptake electrons extracellularly from a polarized electrode to incorporate them into their anabolic metabolism. However, the efficiency of current MES reactor ... ...

Abstract	Microbial electrosynthesis (MES) constitutes a bioelectrochemical process where bacteria uptake electrons extracellularly from a polarized electrode to incorporate them into their anabolic metabolism. However, the efficiency of current MES reactor designs can be lower than expected due to limitations regarding electron transfer and mass transport. One of the most promising bioreactor configurations to overcome these bottlenecks is the Microbial Electrochemical Fluidized Bed Reactor (ME-FBR). In this study, microbial CO
MeSH term(s)	Carbon Dioxide/metabolism ; Biomass ; Fatty Acids, Volatile ; Acetates ; Electrodes
Chemical Substances	Carbon Dioxide (142M471B3J) ; Fatty Acids, Volatile ; Acetates
Language	English
Publishing date	2024-01-17
Publishing country	United States
Document type	Journal Article
ZDB-ID	2406063-X
ISSN	1751-7915 ; 1751-7915
ISSN (online)	1751-7915
ISSN	1751-7915
DOI	10.1111/1751-7915.14383
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Fluid-like cathode enhances valuable biomass production from brewery wastewater in purple phototrophic bacteria.

Manchon, Carlos / Asensio, Yeray / Muniesa-Merino, Fernando / Llorente, María / Pun, Álvaro / Esteve-Núñez, Abraham

Frontiers in microbiology

2023 Volume 14, Page(s) 1115956

Abstract: The climate crisis requires rethinking wastewater treatment to recover resources, such as nutrients and energy. In this scenario, purple phototrophic bacteria (PPB), the most versatile microorganisms on earth, are a promising alternative to transform the ...

Abstract	The climate crisis requires rethinking wastewater treatment to recover resources, such as nutrients and energy. In this scenario, purple phototrophic bacteria (PPB), the most versatile microorganisms on earth, are a promising alternative to transform the wastewater treatment plant concept into a biorefinery model by producing valuable protein-enriched biomass. PPB are capable of interacting with electrodes, exchanging electrons with electrically conductive materials. In this work, we have explored for mobile-bed (either stirred or fluidized) cathodes to maximize biomass production. For this purpose, stirred-electrode reactors were operated with low-reduced (3.5 e
Language	English
Publishing date	2023-03-13
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2587354-4
ISSN	1664-302X
ISSN	1664-302X
DOI	10.3389/fmicb.2023.1115956
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Article ; Online: Water treatment and reclamation by implementing electrochemical systems with constructed wetlands.

Mosquera-Romero, Suanny / Ntagia, Eleftheria / Rousseau, Diederik P L / Esteve-Núñez, Abraham / Prévoteau, Antonin

Environmental science and ecotechnology

2023 Volume 16, Page(s) 100265

Abstract: Seasonal or permanent water scarcity in off-grid communities can be alleviated by recycling water in decentralized wastewater treatment systems. Nature-based solutions, such as constructed wetlands (CWs), have become popular solutions for sanitation in ... ...

Abstract	Seasonal or permanent water scarcity in off-grid communities can be alleviated by recycling water in decentralized wastewater treatment systems. Nature-based solutions, such as constructed wetlands (CWs), have become popular solutions for sanitation in remote locations. Although typical CWs can efficiently remove solids and organics to meet water reuse standards, polishing remains necessary for other parameters, such as pathogens, nutrients, and recalcitrant pollutants. Different CW designs and CWs coupled with electrochemical technologies have been proposed to improve treatment efficiency. Electrochemical systems (ECs) have been either implemented within the CW bed (ECin-CW) or as a stage in a sequential treatment (CW + EC). A large body of literature has focused on ECin-CW, and multiple scaled-up systems have recently been successfully implemented, primarily to remove recalcitrant organics. Conversely, only a few reports have explored the opportunity to polish CW effluents in a downstream electrochemical module for the electro-oxidation of micropollutants or electro-disinfection of pathogens to meet more stringent water reuse standards. This paper aims to critically review the opportunities, challenges, and future research directions of the different couplings of CW with EC as a decentralized technology for water treatment and recovery.
Language	English
Publishing date	2023-03-21
Publishing country	Netherlands
Document type	Journal Article
ISSN	2666-4984
ISSN (online)	2666-4984
DOI	10.1016/j.ese.2023.100265
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Article ; Online: Microbial photoelectrosynthesis: Feeding purple phototrophic bacteria electricity to produce bacterial biomass.

Manchon, Carlos / Muniesa-Merino, Fernando / Llorente, María / Esteve-Núñez, Abraham

Microbial biotechnology

2022 Volume 16, Issue 3, Page(s) 569–578

Abstract: Purple phototrophic bacteria are one of the main actors in chemolithotrophic carbon fixation and, therefore, fundamental in the biogeochemical cycle. These microbes are capable of using insoluble electron donors such as ferrous minerals or even carbon- ... ...

Abstract	Purple phototrophic bacteria are one of the main actors in chemolithotrophic carbon fixation and, therefore, fundamental in the biogeochemical cycle. These microbes are capable of using insoluble electron donors such as ferrous minerals or even carbon-based electrodes. Carbon fixation through extracellular electron uptake places purple phototrophic bacteria in the field of microbial electrosynthesis as key carbon capturing microorganisms. In this work we demonstrate biomass production dominated by purple phototrophic bacteria with a cathode (-0.6 V vs. Ag/AgCl) as electron donor. In addition, we compared the growth and microbial population structure with ferrous iron as the electron donor. We detect interaction between the cathode and the consortium showing a midpoint potential of 0.05 V (vs. Ag/AgCl). Microbial community analyses revealed different microbial communities depending on the electron donor, indicating different metabolic interactions. Electrochemical measurements together with population analyses point to Rhodopseudomonas genus as the key genus in the extracellular electron uptake. Furthermore, the genera Azospira and Azospirillum could play a role in the photoelectrotrophic consortium.
MeSH term(s)	Biomass ; Rhodopseudomonas ; Iron/metabolism ; Electricity ; Carbon/metabolism ; Electrodes
Chemical Substances	Iron (E1UOL152H7) ; Carbon (7440-44-0)
Language	English
Publishing date	2022-12-19
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2406063-X
ISSN	1751-7915 ; 1751-7915
ISSN (online)	1751-7915
ISSN	1751-7915
DOI	10.1111/1751-7915.14190
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Article ; Online: Multi-Criteria Evaluation and Sensitivity Analysis for the Optimal Location of Constructed Wetlands (METland) at Oceanic and Mediterranean Areas.

Peñacoba-Antona, Lorena / Gómez-Delgado, Montserrat / Esteve-Núñez, Abraham

International journal of environmental research and public health

2021 Volume 18, Issue 10

Abstract: METland is a new variety of Constructed Wetland (CW) for treating wastewater where gravel is replaced by a biocompatible electroconductive material to stimulate the metabolism of electroactive bacteria. The system requires a remarkably low land footprint ...

Abstract	METland is a new variety of Constructed Wetland (CW) for treating wastewater where gravel is replaced by a biocompatible electroconductive material to stimulate the metabolism of electroactive bacteria. The system requires a remarkably low land footprint (0.4 m
MeSH term(s)	Waste Disposal, Fluid ; Wastewater/analysis ; Wetlands
Chemical Substances	Waste Water
Language	English
Publishing date	2021-05-19
Publishing country	Switzerland
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	2175195-X
ISSN	1660-4601 ; 1661-7827
ISSN (online)	1660-4601
ISSN	1661-7827
DOI	10.3390/ijerph18105415
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Article: A review on antibiotics removal: Leveraging the combination of grey and green techniques

Fu, Jingmiao / Zhao, Yaqian / Yao, Qi / Addo-Bankas, Olivia / Ji, Bin / Yuan, Yujie / Wei, Ting / Esteve-Núñez, Abraham

Science of the total environment. 2022 Sept. 10, v. 838

2022

Abstract: Antibiotics are currently a major source of concern around the world due to the serious risks posed to human health and the environment. The performance of the secondary wastewater treatment processes/technologies (representing grey process) and ... ...

Abstract	Antibiotics are currently a major source of concern around the world due to the serious risks posed to human health and the environment. The performance of the secondary wastewater treatment processes/technologies (representing grey process) and constructed wetlands (CWs) (typical green process) in removing antibiotics and antibiotic resistance genes (ARG) was reviewed. The result showed that the grey process mainly removes antibiotics, but does not significantly remove ARG, and some processes may even cause ARG enrichment. The overall treatment in CWs is better than WWTPs, especially for ARG. Vertical subsurface flow CWs (VFCWs) are more conductive to antibiotics removal, while horizontal subsurface flow CWs (HFCWs) have a better ARG removal. More importantly, this review admits and suggests that the combination of grey process with green process is an effective strategy to remove antibiotics and ARG. The most advantage of the combination lies in realizing complementary advantages, i.e. the grey process as the primary treatment while CWs as the polishing stage. The efficiency of such the hybrid system is much higher than either single treatment process.
Keywords	antibiotic resistance ; environment ; human health ; subsurface flow ; wastewater treatment
Language	English
Dates of publication	2022-0910
Publishing place	Elsevier B.V.
Document type	Article
ZDB-ID	121506-1
ISSN	1879-1026 ; 0048-9697
ISSN (online)	1879-1026
ISSN	0048-9697
DOI	10.1016/j.scitotenv.2022.156427
Database	NAL-Catalogue (AGRICOLA)

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Article: Electroactive biochar outperforms highly conductive carbon materials for biodegrading pollutants by enhancing microbial extracellular electron transfer

Prado, Amanda / Berenguer, Raúl / Esteve-Núñez, Abraham

Carbon. 2019 May, v. 146

2019

Abstract: The development and full-scale application of microbial electrochemical technologies (METs) for wastewater treatment demand massive amounts of electroconductive carbon materials to promote extracellular electron transfer (EET) and biodegradation. While ... ...

Abstract	The development and full-scale application of microbial electrochemical technologies (METs) for wastewater treatment demand massive amounts of electroconductive carbon materials to promote extracellular electron transfer (EET) and biodegradation. While the potential capability of these materials and their properties to design efficient systems is still in their infancy, the state-of-the-art METs are based on highly-conductive fossil-derived carbons. In this work we evaluate the performance of different electroconductive carbon materials (graphite, coke, biochar) for supporting microbial EET and treating urban wastewater. Our results reveal that the electroconductive biochar was the most efficient biofilter-material, enabling to stimulate bioremediation at anodic potential as high as 0.6 V (maximum removal efficiency (92%) and degradation rate (185 g-COD m−3d−1)), and to fulfill the discharge limits under conditions where the other materials failed. A deep materials characterization suggests that, despite electroconductivity is necessary, the optimal EET on biochar can be mainly assigned to its large number of electroactive surface oxygen functionalities, which can reversibly exchange electrons through the geobattery mechanism. We propose the modulation of quinone-like e-acceptors by anodic polarization to promote the biodegradation capability of carbon materials. Because of its great efficiency and sustainability, electroactive biochar will greatly expand the applicability of METs at large scale.
Keywords	biochar ; biodegradation ; bioremediation ; electrical conductivity ; electrochemistry ; electron transfer ; electrons ; graphene ; oxygen ; pollutants ; wastewater ; wastewater treatment
Language	English
Dates of publication	2019-05
Size	p. 597-609.
Publishing place	Elsevier Ltd
Document type	Article
ISSN	0008-6223
DOI	10.1016/j.carbon.2019.02.038
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: Fluidized bed cathodes as suitable electron donors for bacteria to remove nitrogen and produce biohydrogen

Tejedor-Sanz Sara / Fernández-Labrador Patricia / Manchón Carlos / Esteve-Núñez Abraham

Electrochemistry Communications, Vol 116, Iss , Pp 106759- (2020)

2020

Abstract: Microbial Electrochemical Fluidized Bed Reactors (ME-FBR) represent a new concept for promoting proper bacteria-electrode interaction and eventually efficient biocatalysis in Microbial Electrochemical Technologies (METs). In the current work we ... ...

Abstract	Microbial Electrochemical Fluidized Bed Reactors (ME-FBR) represent a new concept for promoting proper bacteria-electrode interaction and eventually efficient biocatalysis in Microbial Electrochemical Technologies (METs). In the current work we demonstrate how a fluidized cathode, a dynamic and discontinuous design of electrode, can be an effective electron donor for electroactive hydrogen-generating and nitrate reducing bacteria. Furthermore, the oxygen produced in the anodic reaction promoted ammonium oxidation to nitrate by nitrifying bacteria thus expanding the environmental applications of the system. By coupling both anodic and cathodic reactions, it was possible to simultaneously achieve nitrification–denitrification within one chamber and without external oxygen addition. Our proof-of-concept revealed the removal of 98% ammonium and ca. 29% of total nitrogen (31 g-N m−3reactor d−1) from an effluent with low organic matter under continuous mode. This study reveals for first time how fluidized beds can be integrated in METs not only as anodes but also as cathodes, broadening the opportunities and applications to bioremediation and bioelectrosynthesis processes.
Keywords	Fluidized bed electrodes ; Microbial electrochemistry ; Fluidized cathode ; Nitrogen removal ; METs ; Industrial electrochemistry ; TP250-261 ; Chemistry ; QD1-999
Subject code	660
Language	English
Publishing date	2020-07-01T00:00:00Z
Publisher	Elsevier
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article: Microbial Electrochemical Fluidized Bed Reactor: A Promising Solution for Removing Pollutants From Pharmaceutical Industrial Wastewater.

Asensio, Yeray / Llorente, María / Sánchez-Gómez, Alejandro / Manchon, Carlos / Boltes, Karina / Esteve-Núñez, Abraham

Frontiers in microbiology

2021 Volume 12, Page(s) 737112

Abstract: The capacity of electroactive bacteria to exchange electrons with electroconductive materials has been explored during the last two decades as part of a new field called electromicrobiology. Such microbial metabolism has been validated to enhance the ... ...

Abstract	The capacity of electroactive bacteria to exchange electrons with electroconductive materials has been explored during the last two decades as part of a new field called electromicrobiology. Such microbial metabolism has been validated to enhance the bioremediation of wastewater pollutants. In contrast with standard materials like rods, plates, or felts made of graphite, we have explored the use of an alternative strategy using a fluid-like electrode as part of a microbial electrochemical fluidized bed reactor (ME-FBR). After verifying the low adsorption capacity of the pharmaceutical pollutants on the fluid-bed electrode [7.92 ± 0.05% carbamazepine (CBZ) and 9.42 ± 0.09% sulfamethoxazole (SMX)], our system showed a remarkable capacity to outperform classical solutions for removing pollutants (more than 80%) from the pharmaceutical industry like CBZ and SMX. Moreover, the ME-FBR performance revealed the impact of selecting an anode potential by efficiently removing both pollutants at + 200 mV. The high TOC removal efficiency also demonstrated that electrostimulation of electroactive bacteria in ME-FBR could overcome the expected microbial inhibition due to the presence of CBZ and SMX. Cyclic voltammograms revealed the successful electron transfer between microbial biofilm and the fluid-like electrode bed throughout the polarization tests. Finally,
Language	English
Publishing date	2021-11-26
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2587354-4
ISSN	1664-302X
ISSN	1664-302X
DOI	10.3389/fmicb.2021.737112
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Article ; Online: Designing strategies for operating Microbial Electrochemical Systems to clean up polluted soils under non-flooded conditions.

Domínguez-Garay, Ainara / Esteve-Núñez, Abraham

Bioelectrochemistry (Amsterdam, Netherlands)

2018 Volume 124, Page(s) 142–148

Abstract: Microbial Electrochemical Systems can be setup in soil either for the harvesting of energy from microbial metabolism (sediment microbial fuel cell, SMFC) or for the bioremediation of polluted environments (Microbial Electroremediating Cell, MERC). ... ...

Abstract	Microbial Electrochemical Systems can be setup in soil either for the harvesting of energy from microbial metabolism (sediment microbial fuel cell, SMFC) or for the bioremediation of polluted environments (Microbial Electroremediating Cell, MERC). However, the precieved need for this technology to be located in flooded environments, to assure the ionic contact between anode and cathode, has limited its implementation in standard soils. This work describes a new configuration that overcomes this limitation by integrating an out-of-soil cathodic chamber with a ceramic barrier so a closed circuit system can be achieved without flooding the soil. On top of harvesting energy under this new configuration we have outperformed natural bioremediation by restoring an atrazine polluted soil as proof of concept. Our results showed that >98% of the initially available atrazine was efficiency removed after 2 weeks with this new MERC configuration, in contrast with a mere 58% removal obtained under natural attenuation. Moreover, a set of toxicological tests using green algae, Salmonella typhimurium and Sorghum saccharatum strongly confirmed a marked lack of toxicity in the soil after the bioelectrochemical treatment in contrast with the natural attenuation that was unable to fulfill the non-toxic level.
MeSH term(s)	Atrazine/isolation & purification ; Atrazine/toxicity ; Bioelectric Energy Sources ; Ceramics ; Chlorophyta/drug effects ; Chlorophyta/genetics ; Electrodes ; Environmental Restoration and Remediation/methods ; Floods ; Herbicides/isolation & purification ; Herbicides/toxicity ; Mutagenicity Tests ; Reproducibility of Results ; Salmonella typhimurium/drug effects ; Salmonella typhimurium/genetics ; Soil Pollutants/isolation & purification ; Soil Pollutants/toxicity ; Sorghum/drug effects ; Sorghum/genetics
Chemical Substances	Herbicides ; Soil Pollutants ; Atrazine (QJA9M5H4IM)
Language	English
Publishing date	2018-03-17
Publishing country	Netherlands
Document type	Journal Article
ZDB-ID	2010650-6
ISSN	1878-562X ; 0302-4598 ; 1567-5394
ISSN (online)	1878-562X
ISSN	0302-4598 ; 1567-5394
DOI	10.1016/j.bioelechem.2018.03.006
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