The Planktonic Relationship Between Fluid‐Like Electrodes and Bacteria: Wiring in Motion

Tejedor-Sanz, Sara; Quejigo, Jose Rodrigo; Berná, Antonio; Esteve‐Núñez, Abraham

doi:10.1002/cssc.201601329

Cited by 32 publications

(19 citation statements)

References 54 publications

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“…The ME-FBR was designed as previously described ( Tejedor-Sanz et al, 2017b ). A schematic of the system is shown in Supplementary Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

“…This fact suggests a new paradigm in bioelectrochemical systems in which direct extracellular electron transfer (EET) does not proceed through biofilm formation. In contrast to this planktonic interaction, by using porous particles in motion and with a more hydrophilic and irregular surface than glassy carbon beads (i.e., activated carbon), a biofilm architecture of a mixed culture can also be achieved ( Kong et al, 2011 ; Deeke et al, 2015 ; Tejedor-Sanz et al, 2017b ).…”

Section: Introductionmentioning

confidence: 99%

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Geobacter Dominates the Inner Layers of a Stratified Biofilm on a Fluidized Anode During Brewery Wastewater Treatment

et al. 2018

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In this study, we designed a microbial electrochemical fluidized bed reactor (ME-FBR), with an electroconductive anodic bed made of activated carbon particles for treating a brewery wastewater. Under a batch operating mode, acetate and propionate consumption rates were 13-fold and 2.4-fold higher, respectively, when the fluidized anode was polarized (0.2 V) with respect to open circuit conditions. Operating in a continuous mode, this system could effectively treat the brewery effluent at organic loading rates (OLR) over 1.7 kg m-3NRV d-1 and with removal efficiencies of 95 ± 1.4% (hydraulic retention time of 1 day and an influent of 1.7 g-COD L-1). The coulombic efficiency values highly depended upon the OLR applied, and varied from a 56 ± 15% to 10 ± 1%. Fluorescence in situ hybridization (FISH) analysis revealed a relative high abundance of Geobacter species (ca. 20%), and clearly showed a natural microbial stratification. Interestingly, the Geobacter cluster was highly enriched in the innermost layers of the biofilm (thickness of 10 μm), which were in contact with the electroconductive particles of bed, whereas the rest of bacteria were located in the outermost layers. To our knowledge, this is the first time that such a clear microbial stratification has been observed on an anode-respiring biofilm. Our results revealed the relevant role of Geobacter in switching between the electrode and other microbial communities performing metabolic reactions in the outermost environment of the biofilm.

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“…The ME-FBR was designed as previously described ( Tejedor-Sanz et al, 2017b ). A schematic of the system is shown in Supplementary Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geobacter Dominates the Inner Layers of a Stratified Biofilm on a Fluidized Anode During Brewery Wastewater Treatment

et al. 2018

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“…In previous studies focusing on MET performance, the interaction of a wide variety of microbial communities has been identified, which through DEET processes leads to energy generation [4]. Is understood that as long as there are available substrates in a MET, methanogenic, fermentative and electroactive communities can interact and develop biomass in suspension in the aqueous environment [62] as well as biofilms attached to an electrode [63].…”

Section: Electroactive Bacteria and Mixed Biofilms Formationmentioning

confidence: 99%

“…Other systems based on non-spontaneous reactions rely on merging a classical fluidized reactor with a MET, like the so-called microbial electrochemical fluidized bed reactor (ME-FBR) [62]. The ME-FBR has been developed to maximize the superficial area of the anode being available for electroactive microorganisms, and improving the kinetics of the catalysis by employing an environment with favorable mixing properties.…”

Section: Non-spontaneous Reaction Systemsmentioning

confidence: 99%

Microbial Electrochemical Technologies for Wastewater Treatment: Principles and Evolution from Microbial Fuel Cells to Bioelectrochemical-Based Constructed Wetlands

Ramírez-Vargas

Prado

Arias

et al. 2018

Water

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108

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Microbial electrochemical technologies (MET) rely on the presence of the metabolic activity of electroactive bacteria for the use of solid-state electrodes for oxidizing different kinds of compound that can lead to the synthesis of chemicals, bioremediation of polluted matrices, the treatment of contaminants of interest, as well as the recovery of energy. Keeping these possibilities in mind, there has been growing interest in the use of electrochemical technologies for wastewater treatment, if possible with simultaneous power generation, since the beginning of the present century. In the last few years, there has been growing interest in exploring the possibility of merging MET with constructed wetlands offering a new option of an intensified wetland system that could maintain a high performance with a lower footprint. Based on that interest, this paper explains the general principles of MET, and the different known extracellular electron transfer mechanisms ruling the interaction between electroactive bacteria and potential solid-state electron acceptors. It also looks at the adoption of those principles for the development of MET set-ups for simultaneous wastewater treatment and power generation, and the challenges that the technology faces. Ultimately, the most recent developments in setups that merge MET with constructed wetlands are presented and discussed.

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“…). Shuttling electrons through an electrode is not limited only to biofilm, but could also happen via the growth of free electroactive bacterial cells assisted by a fluid‐like anode and with electron shuttling rates similar to those described for electroactive biofilms . BESs technology can substitute energy intensive wastewater treatment processes and generate chemical products …”

Section: Caproate Production By Bessmentioning

confidence: 99%

Bioelectrochemical synthesis of caproate through chain elongation as a complementary technology to anaerobic digestion

Reddy

ElMekawy

Pant

2018

Biofuels Bioprod Bioref

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Chain elongation is one of the common anaerobic fermentation processes in which bacteria convert ethanol and short chain fatty acids (SCFA) into medium chain fatty acids (MCFA). These are single carboxylic acids having six to twelve carbon atoms, with several applications, such as biofuels. Caproate is a promising MCFA, and several technologies were proposed for the valorization of waste to obtain it. Bioelectrochemical systems (BESs) are technologies that are capable of converting the chemical energy of organic/inorganic wastes into value‐added products, using in situ generated H2 or electricity as energy sources. To convert waste biomass into caproate, an electron donor in the form of hydrogen or ethanol should be supplemented within the anaerobic fermentation, which can be used as the electron donor in the cathodic compartment for the conversion of acetate into caproate. This review highlights recent anaerobic and bioelectrochemical processes for the production of caproate. The discussion will also cover the potential applications of this technology, together with obstacles to its use, compared with the conventional anaerobic digestion (AD) process, and considers whether it could be a standalone technology or a complementary one for AD. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd

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The Planktonic Relationship Between Fluid‐Like Electrodes and Bacteria: Wiring in Motion

Cited by 32 publications

References 54 publications

Geobacter Dominates the Inner Layers of a Stratified Biofilm on a Fluidized Anode During Brewery Wastewater Treatment

Geobacter Dominates the Inner Layers of a Stratified Biofilm on a Fluidized Anode During Brewery Wastewater Treatment

Microbial Electrochemical Technologies for Wastewater Treatment: Principles and Evolution from Microbial Fuel Cells to Bioelectrochemical-Based Constructed Wetlands

Bioelectrochemical synthesis of caproate through chain elongation as a complementary technology to anaerobic digestion

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