Critical Biofilm Growth throughout Unmodified Carbon Felts Allows Continuous Bioelectrochemical Chain Elongation from CO2 up to Caproate at High Current Density

Jourdin, Ludovic; Raes, Sanne M. T.; Buisman, Cees J.N.; Strik, D.P.B.T.B.

doi:10.3389/fenrg.2018.00007

Cited by 167 publications

(134 citation statements)

References 59 publications

Supporting

Mentioning

127

Contrasting

Order By: Relevance

“…Reductive bioelectrochemical processes rely on the transfer of electrons from a cathode to a microbial catalyst for the reduction of a substrate with protons coming from an anodic reaction [1,2]. The substrate can be inorganic carbon molecules like CO 2 that will be reduced to multicarbon compounds or CH 4 via microbial electrosynthesis (MES) [3][4][5][6][7][8][9][10]. Organic carbon compounds can also be converted into commodity chemicals via electrofermentation [11,12] or electrorespiration [13].…”

Section: Introductionmentioning

confidence: 99%

Accelerated H2 Evolution during Microbial Electrosynthesis with Sporomusa ovata

2019

View full text Add to dashboard Cite

Microbial electrosynthesis (MES) is a process where bacteria acquire electrons from a cathode to convert CO2 into multicarbon compounds or methane. In MES with Sporomusa ovata as the microbial catalyst, cathode potential has often been used as a benchmark to determine whether electron uptake is hydrogen-dependent. In this study, H2 was detected by a microsensor in proximity to the cathode. With a sterile fresh medium, H2 was produced at a potential of −700 mV versus Ag/AgCl, whereas H2 was detected at −500 mV versus Ag/AgCl with cell-free spent medium from a S. ovata culture. Furthermore, H2 evolution rates were increased with potentials lower than −500 mV in the presence of cell-free spent medium in the cathode chamber. Nickel and cobalt were detected at the cathode surface after exposure to the spent medium, suggesting a possible participation of these catalytic metals in the observed faster hydrogen evolution. The results presented here show that S. ovata-induced alterations of the cathodic electrolytes of a MES reactor reduced the electrical energy required for hydrogen evolution. These observations also indicated that, even at higher cathode potentials, at least a part of the electrons coming from the electrode are transferred to S. ovata via H2 during MES.

show abstract

Section: Introductionmentioning

confidence: 99%

Accelerated H2 Evolution during Microbial Electrosynthesis with Sporomusa ovata

2019

View full text Add to dashboard Cite

show abstract

“…The pH and conductivity were directly measured after sampling by using a HACH HQ440d multi pH/LDO/conductivity meter (Hach Company, Loveland Colorado, CO, USA). Samples for acetate analysis were kept in a fridge at −20 • C to be measured later using gas chromatography as described earlier [45,54].…”

Section: Ph Conductivity and Acetate Analysismentioning

confidence: 99%

Activated Carbon Mixed with Marine Sediment is Suitable as Bioanode Material for Spartina anglica Sediment/Plant Microbial Fuel Cell: Plant Growth, Electricity Generation, and Spatial Microbial Community Diversity

Sudirjo

Buisman

Strik

2019

Water

View full text Add to dashboard Cite

Wetlands cover a significant part of the world's land surface area. Wetlands are permanently or temporarily inundated with water and rich in nutrients. Therefore, wetlands equipped with Plant-Microbial Fuel Cells (Plant-MFC) can provide a new source of electricity by converting organic matter with the help of electrochemically active bacteria. In addition, sediments provide a source of electron donors to generate electricity from available (organic) matters. Eight lab-wetlands systems in the shape of flat-plate Plant-MFC were constructed. Here, four wetland compositions with activated carbon and/or marine sediment functioning as anodes were investigated for their suitability as a bioanode in a Plant-MFC system. Results show that Spartina anglica grew in all of the Plant-MFCs, although the growth was less fertile in the 100% activated carbon (AC100) Plant-MFC. Based on long-term performance (2 weeks) under 1000 ohm external load, the 33% activated carbon (AC33) Plant-MFC outperformed the other Plant-MFCs in terms of current density (16.1 mA/m 2 plant growth area) and power density (1.04 mW/m 2 plant growth area). Results also show a high diversity of microbial communities dominated by Proteobacteria with 42.5-69.7% relative abundance. Principal Coordinates Analysis shows clear different bacterial communities between 100% marine sediment (MS100) Plant-MFC and AC33 Plant-MFC. This result indicates that the bacterial communities were affected by the anode composition. In addition, small worms (Annelida phylum) were found to live around the plant roots within the anode of the wetland with MS100. These findings show that the mixture of activated carbon and marine sediment are suitable material for bioanodes and could be useful for the application of Plant-MFC in a real wetland. Moreover, the usage of activated carbon could provide an additional function like wetland remediation or restoration, and even coastal protection. 2 of 23 production; carbon fixation and storage; flood mitigation and water storage; water treatment and purification; and habitats for biodiversity. About 5-10% of the world's land surface is covered by wetlands [2]. A recent study reported that the global wetland area is between 15 and 16 million km 2 , in which about 8.9-9.5% is coastal wetlands [3]. Unfortunately, despite their critical role wetlands are facing a serious problem of losses caused by human activities. A study has shown that at least 33% of global wetlands had been lost as of 2009 due to human activities [1]. This loss was comparable to a previous study reporting that between 1970 and 2008, natural wetland declined globally by about 30% [4].Sediment pollution by human activities is a major problem for wetland ecosystems [5]. By nature, wetland sediments are able to remedy themselves from pollutants, such as petroleum hydrocarbon pollutants, due to the presence of diverse microbial communities [6]. However, in some cases such as to control hydrophobic organic compounds (HOCs), an in-situ amendment by human interference is applied for ...

show abstract

“…The reported production of caproate was 2.187 and 2.66 mmol L −1 during the batch and continuous modes, respectively, after 120 h. The continuous mode of fermentation is industrially beneficial compared to batch mode, in terms of a higher amount of substrate and short production time. Moreover, the continuous microbial production of caproate using CO 2 substrate, was further investigated using carbon felt electrodes . The development of thick biofilm was observed on the electrode resulting in a current density of 14 kA m −3 with a caproate production rate that reached 0.95 g L −1 day.…”

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

View full text Add to dashboard Cite

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

show abstract

Critical Biofilm Growth throughout Unmodified Carbon Felts Allows Continuous Bioelectrochemical Chain Elongation from CO2 up to Caproate at High Current Density

Cited by 167 publications

References 59 publications

Accelerated H2 Evolution during Microbial Electrosynthesis with Sporomusa ovata

Accelerated H2 Evolution during Microbial Electrosynthesis with Sporomusa ovata

Activated Carbon Mixed with Marine Sediment is Suitable as Bioanode Material for Spartina anglica Sediment/Plant Microbial Fuel Cell: Plant Growth, Electricity Generation, and Spatial Microbial Community Diversity

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

Contact Info

Product

Resources

About