Microbial electrochemical separation of CO2 for biogas upgrading

Kokkoli, Argyro; Zhang, Yifeng; Angelidaki, Irini

doi:10.1016/j.biortech.2017.09.097

Cited by 46 publications

(28 citation statements)

References 26 publications

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“…Biogas upgrading is one of the most efficient technologies that receives great interest in bioenergy industry (Kokkoli et al, 2018). It aims to concentrate the methane in biogas by removal or transformation of CO 2 and other impurities (Kougias et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Biogas upgrading and biochemical production from gas fermentation: Impact of microbial community and gas composition

Omar

El-Gammal

Abou-Shanab

et al. 2019

Bioresource Technology

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The present study proposes a novel alternative method of the current biogas upgrading techniques by converting CO 2 (in the biogas) into valuable chemicals (e.g., volatile fatty acids) using H 2 as energy source and acetogenic mixed culture as biocatalyst. The influence of thermal treatment (90°C) on the inhibition of the methanogenic archaea and enriching the acetogenic bacteria in different inocula (mesophilic and thermophilic) was initially tested.The most efficient inoculum that achieved the highest performance through the fermentation process was further used to define the optimum H 2 /CO 2 gas ratio that secures maximum production yield of chemicals and maximum biogas upgrading efficiency. In addition, 16S rRNA analysis of the microbial community was conducted at the end of the experimental period to target functional microbes. The maximum biogas content (77% (v/v)) and acetate yield (72%) were achieved for 2H 2 :1CO 2 ratio (v/v), with Moorella sp. 4 as the most dominant thermophilic acetogenic bacterium.

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Section: Introductionmentioning

confidence: 99%

Biogas upgrading and biochemical production from gas fermentation: Impact of microbial community and gas composition

Omar

El-Gammal

Abou-Shanab

et al. 2019

Bioresource Technology

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“…Kokkoli et al [32] performed a similar experiment for a shorter period (5 days), lower current density (0.32 -0.39 A m -2 ) and lower volume of biogas injected (0.36 L in total), reaching a removal efficiency of 99 % of CO2 from a synthetic biogas stream. Another study found a CO2 removal efficiency close to 100 % during the first days of operation when the injected concentration of CO2 was kept below % from the total gas composition until the end of the experiment.…”

Section: Electrochemical Biogas Upgrading Enables Effective Separation Of Ch4 and Co2mentioning

confidence: 99%

Microbial protein production from methane via electrochemical biogas upgrading

Acosta

Sakarika

Kerckhof

et al. 2020

Chemical Engineering Journal

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Microbial protein (MP) can alleviate the increasing pressure of food demand on agriculture and our environment. For its sustainable production, feedstocks such as biomethane or (bio)hydrogen are needed. Here, we coupled biogas produced from agricultural waste directly with electrochemical biogas upgrading to subsequently produce MP from methane, hydrogen or a mixture thereof. Biogas was produced from co-digestion of pumpkin and pig manure at production rates of 0.73 ± 0.24 Lbiogas L -1 reactor day -1 (59 % CH4) and 0.59 ± 0.29 Lbiogas L -1 reactor day -1 (50% CH4). The biogas was directed to the cathode of an electrochemical cell. At current densities of 20 and 40 A m −2 , CO2 removal efficiencies of 88 ± 14 % and 99 ± 1 % were achieved. Enrichments of MP (hydrogen-and methane oxidizing bacterial cultures)were cultivated on either raw biogas or gases obtained from the cathode (CH4, CO2, H2) and anode (CO2, O2) in batch mode with external supplementation of O2 and H2 when required.The best performance was obtained when the cathode off-gas was used in terms of biomass concentration (0.585 g CDW L -1 ), yield (0.150 g CDW g -1 COD), efficiency of COD conversion to protein (17%) volumetric biomass productivity (0.226 g CDW L -1 day -1 ) and volumetric protein productivity (0.181 g protein L -1 day -1 ). The protein content was similar when using anode and cathode off-gases (66.3 ± 7.3 % of CDW) with raw biogas resulting in a 6 % lower protein content. This proof of concept demonstrated that electrochemical biogas upgrading enables steering MP production.

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“…The MEC configuration directly affects its functions . Kokkoli et al . used an innovative microbial electrochemical separation cell to in situ separate and regenerate CO 2 via alkali and acid regeneration.…”

Section: Research Advancesmentioning

confidence: 99%

“…140 The MEC configuration directly affects its functions. 141 Kokkoli et al 142 used an innovative microbial electrochemical separation cell to in situ separate and regenerate CO 2 via alkali and acid regeneration. This reactor consisted of four successive chambers: the anode, regeneration chamber, absorption chamber and cathode.…”

Section: Optimization For Mec Configurationmentioning

confidence: 99%

Microbial electrolysis cell as an emerging versatile technology: a review on its potential application, advance and challenge

Hua

et al. 2019

J of Chemical Tech & Biotech

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Microbial electrolysis cells (MECs) have been studied in a wide range of potential applications such as recalcitrant pollutants removal, chemicals synthesis, resources recovery and biosensors. However, MEC technology is still in its infancy and poses serious challenges for practical large‐scale applications. To understand the diversified applications of MEC, this review aims to explore MEC applications in the following contexts: an overview of MEC for energy generation and recycling such as hydrogen, methane, formic acid and hydrogen peroxide; contaminant removal, specifically complex organic pollutants and inorganic pollutants; as a sensor; as well as resource recovery. New concepts of MEC technology; configuration optimization; electron transfer pathways in biocathodes, and coupling with other technologies for value‐added applications such as MEC‐anaerobic digestion, MEC‐MFC, MEC‐MDC and bio‐E‐Fenton system are discussed. Finally, challenges and outlooks are suggested. The review aims to assist researchers and engineers to understand the latest trends in MEC technologies and applications. © 2018 Society of Chemical Industry

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Microbial electrochemical separation of CO2 for biogas upgrading

Cited by 46 publications

References 26 publications

Biogas upgrading and biochemical production from gas fermentation: Impact of microbial community and gas composition

Biogas upgrading and biochemical production from gas fermentation: Impact of microbial community and gas composition

Microbial protein production from methane via electrochemical biogas upgrading

Microbial electrolysis cell as an emerging versatile technology: a review on its potential application, advance and challenge

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