Bed electrodes in microbial electrochemistry: setup, operation and characterization

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

doi:10.1007/s40828-019-0078-3

Cited by 16 publications

(8 citation statements)

References 101 publications

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“…Cyclic voltammetry (CV) analysis (Figure 4A) showed an undefined CV shape in BES E2 (Figure 4A D−F) and BES E3 (Figure 4 a) G−I) before and after inoculation that is impeding analysis on the underlying extracellular electron (EET) mechanisms, [44] as it was already shown for different 3‐dimensional electrodes used for EAM cultivation like bed‐electrodes [45] or carbon nanotubes [46] sponges. Only for early stages in BES E1 , the first derivative of the CV reveals the oxidative and reductive potential as two maxima.…”

Section: Resultsmentioning

confidence: 90%

Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

et al. 2021

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Porous SiOC tapes were studied as anodes for bioelectrochemical system (BES) using Geobacter spp. as an electroactive microorganism (EAM). The ceramic anodes were produced by tape‐casting of poly(silsesquioxanes), tailoring the surface properties by incorporating graphite and carbon black, and changing the pyrolysis temperature. By varying these parameters, the specific surface area, the hydrophilicity, and the roughness were adjusted, with the pyrolysis temperature playing a major role. When used as anodes at 0.2 V vs. Ag/AgCl sat. KCl in the BES, maximum current densities relative to the geometric surface area (jGSA) up to 5.8 A m−2 were achieved. Microbial community analysis of the biofilm shows the dominant presence of Geobacter spp. as the EAM. Benchmarking the performance of the anodes of this study with anodes using the same EAM demonstrates that porous SiOC anodes are a promising class of materials, as they show jGSA comparable to carbon‐based anodes.

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Section: Resultsmentioning

confidence: 90%

Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

et al. 2021

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“…Fluidized granular bed systems improve mass transport of both solids and ions and are thus attractive for MET applications. 20,31 The fluidized capacitive bioanode reactor of Deeke et al 20 showed that charging and discharging could be separated by transporting the charged granules from a charging reactor to an external discharge cell. Other studies used fluidization of a granular bed to make contact between capacitive granules and an anode.…”

Section: Granular Capacitive Bioanodesmentioning

confidence: 99%

“…Fluidized granular bed systems improve mass transport of both solids and ions and are thus attractive for MET applications . The fluidized capacitive bioanode reactor of Deeke et al .…”

Section: Introductionmentioning

confidence: 99%

The granular capacitive moving bed reactor for the scale up of bioanodes

Borsje

Sleutels²,

Saakes³

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Scaling up bioelectrochemical systems for the treatment of wastewater faces challenges. Material costs, low conductivity of wastewater and clogging are issues that need a novel approach. The granular capacitive moving bed reactor can potentially solve these challenges. In this reactor, capacitive activated carbon granules are used as bioanode material. The charge storage capabilities of these capacitive granules allow for the physical separation of the charging and the discharging process and therefore a separation of the wastewater treatment and energy recovery process. RESULTS:This study investigates the performance of the granular capacitive moving bed reactor. In this reactor, activated granules were transported from the bottom to the top of the reactor using a gas lift and settled on top of the granular bed, which moved downwards through the internal discharge cell. This moving granular bed was applied to increase the contact time with the discharge anode to increase the current density. The capacitive moving bed reactor (total volume 7.7 L) produced a maximum current of 23 A m −2 normalized to membrane area (257 A m −3 granules ). Without granules, the current was only 1.4 A m −2 membrane . The activity of the biofilm on the granules increased over time, from 436 up to 1259 A m −3 granules . A second experiment produced similar areal current density and increase in activity over time.CONCLUSION: Whereas the produced current density is promising for further scaling up of bioanodes, the main challenges are to improve the discharge of the charged granules and growth of biofilm on the granules under shear stress.

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“…The fluidization results in a convective contact between particles and current collector. The fluidized nature allows for improved diffusion of substrate and reaction products [96,106,110]. Fluidized bed reactors were originally studied for copper plating on non-capacitive spheres, but the voltage losses were too great for the improved diffusion rates [111] to be beneficial for the electroplating process [112,113].…”

Section: Intermittent Charging and Discharging In Fluidized Bed Bioanodesmentioning

confidence: 99%

“…Fluidized granular bed systems improve mass transport, of both solids and ions, and are thus attractive for MET applications [96,110]. The fluidized capacitive bioanode reactor by Deeke et al (2015) showed that charging and discharging could be separated by transporting the charged granules from a charging reactor to an external discharge cell.…”

Section: Granular Capacitive Bioanodesmentioning

confidence: 99%

Moving bed capacitive bioanodes

Borsje¹

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Chapter 1 1.1. Wastewater treatment technology for removal of organic material Environmental challengeIn modern society, municipalities and industry produce significant volumes of wastewater. Globally, on average 95 m 3 wastewater is produced per capita per year, with in Europe 124 m 3 /capita/year and North America at 231 m 3 /capita/year: a global total of 380×10 9 m 3 per year (2015 data) [1]. Wastewater contains a mixture of several pollutants, such as dissolved organics, and nitrogen and phosphorus compounds, with differing effects on the environment and ecosystems. In nature, the dissolved organics are degraded by aerobic bacteria, resulting in the deoxygenation of the water. This is especially problematic for wastewater discharged into surface waters, which host important ecosystems that rely on oxygen in the water. Nitrogen and phosphorus discharge can result in eutrophication, which in turn leads to reduced biodiversity and possible toxicity due to proliferation of certain algae species [2,3]. At the end of the 19 th century, wastewater treatment -rather than disposal -became more important as these consequences became clear [4]. Wastewater treatment plants (WWTPs) were constructed, connecting in 78% of the population in the EU to primary and secondary treatment (EU-28, status in 2017) [5]. The wastewater treatment process consists of several steps, including but not limited to: primary treatment for the removal of (suspended) solids, secondary for removal of organics, and tertiary for removal of nutrients, minerals, metals, inorganics, taste, color, odor and pathogens [6]. Traditionally, aerobic treatment has been used to remove these organics, but the recovery of energy contained in the organics, has become a goal in itself: firstly, to make the WWTPs less energy intensive and more self-sustainable and secondly to export the energy for use in society. Aerobic treatment and recovery of the energy from organics in wastewater using anaerobic digestion processes and bioelectrochemical systems will be discussed in the following paragraphs [7,8]. Aerobic treatmentAerobic treatment utilizes oxygen for the oxidation of dissolved organics by aerobic bacteria in the controlled environment of WWTPs. Traditional treatment uses large ponds to flow the wastewater through. Oxygen is forced into the water stream at various points in the pools, and the required oxygen is consumed by the growing bacteria while degrading the organic material. The aerobic biomass is collectively called activated sludge. The aeration requires significant amounts of energy. In the last decade, the aeration step consumed between 0.1 and 0.6 kWh/m 3 wastewater in various WWTPs around the world, depending, among others, on climate, size, technology, and chemical oxygen demand (COD) and total nitrogen requirements of influent and effluent [7]. For typical wastewater, 0.5 kgCOD/m 3 [9], the aerobic energy costs are 0.2 to 1.2 kWh/kg COD. The growth of aerobic microorganisms results in a large volume of sludge in suspension in the wastewater stre...

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Bed electrodes in microbial electrochemistry: setup, operation and characterization

Cited by 16 publications

References 101 publications

Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

Impact of Surface Properties of Porous SiOC‐Based Materials on the Performance of Geobacter Biofilm Anodes

The granular capacitive moving bed reactor for the scale up of bioanodes

Moving bed capacitive bioanodes

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