Bioelectrochemical methane (CH4) production in anaerobic digestion at different supplemental voltages

Choi, Kwang-Soon; Kondaveeti, Sanath; Min, Booki

doi:10.1016/j.biortech.2017.09.057

Cited by 130 publications

(28 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Bioelectrochemical systems (BES) were first proposed in 2009 as an alternative way to drive the reduction of CO 2 (dissolved into an aqueous medium) into biomethane [8]. Since then, several electromethanogenesis (EMG) studies were published [6,9,10]. Generally speaking, BES uses electro-active microorganisms for the treatment of wastewater, with production of electricity (microbial fuel cells, MFCs), hydrogen (microbial electrolysis cells, MECs), or other chemicals (microbial electrosynthesis cells, MES) [11].…”

Section: Introductionmentioning

confidence: 99%

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

et al. 2019

View full text Add to dashboard Cite

Anaerobic digestion of sewage sludge produces large amounts of CO2 which contribute to global CO2 emissions. Capture and conversion of CO2 into valuable products is a novel way to reduce CO2 emissions and valorize it. Membrane contactors can be used for CO2 capture in liquid media, while bioelectrochemical systems (BES) can valorize dissolved CO2 converting it to CH4, through electromethanogenesis (EMG). At the same time, EMG process, which requires electricity to drive the conversion, can be utilized to store electrical energy (eventually coming from renewables surplus) as methane. The study aims integrating the two technologies at a laboratory scale, using for the first time real wastewater as CO2 capture medium. Five replicate EMG-BES cells were built and operated individually at 0.7 V. They were fed with both synthetic and real wastewater, saturated with CO2 by membrane contactors. In a subsequent experimental step, four EMG-BES cells were electrical stacked in series while one was kept as reference. CH4 production reached 4.6 L CH4 m−2 d−1, in line with available literature data, at a specific energy consumption of 16–18 kWh m−3 CH4 (65% energy efficiency). Organic matter was removed from wastewater at approximately 80% efficiency. CO2 conversion efficiency was limited (0.3–3.7%), depending on the amount of CO2 injected in wastewater. Even though achieved performances are not yet competitive with other mature methanation technologies, key knowledge was gained on the integrated operation of membrane contactors and EMG-BES cells, setting the base for upscaling and future implementation of the technology.

show abstract

Section: Introductionmentioning

confidence: 99%

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Organic loading, long reaction time, ammonia levels and higher substrate concentrations are the key to enhanced methane production. Up to 40% enrichment of acetoclastic methanogen population was observed during an anaerobic digestion-MEC, which was proposed to efficiently degrade the organic material and convert VFA to CH 4 [85,94]. Methanobacterium palustre was among the first few organisms studied for the CH 4 generation with an abiotic anode and biocathode [47].…”

Section: Biogasmentioning

confidence: 99%

Electro-Fermentation in Aid of Bioenergy and Biopolymers

et al. 2018

View full text Add to dashboard Cite

Abstract:The soaring levels of industrialization and rapid progress towards urbanization across the world have elevated the demand for energy besides generating a massive amount of waste. The latter is responsible for poisoning the ecosystem in an exponential manner, owing to the hazardous and toxic chemicals released by them. In the past few decades, there has been a paradigm shift from "waste to wealth", keeping the value of high organic content available in the wastes of biological origin. The most practiced processes are that of anaerobic digestion, leading to the production of methane. However; such bioconversion has limited net energy yields. Industrial fermentation targeting value-added bioproducts such as-H 2 , butanediols; polyhydroxyalkanoates, citric acid, vitamins, enzymes, etc. from biowastes/lignocellulosic substrates have been planned to flourish in a multi-step process or as a "Biorefinery". Electro-fermentation (EF) is one such technology that has attracted much interest due to its ability to boost the microbial metabolism through extracellular electron transfer during fermentation. It has been studied on various acetogens and methanogens, where the enhancement in the biogas yield reached up to 2-fold. EF holds the potential to be used with complex organic materials, leading to the biosynthesis of value-added products at an industrial scale.

show abstract

“…The variation of the external cell voltage can affect indirectly pH and alkalinity of the solution in MECs due to abiotic reactions at the electrode surface of the MEC, and thus could seriously affect performance of the biocatalyst . The external energy optimization (current or voltage) can play a key and very important role in CH 4 product generation . Many studies indicated that combining AD with MEC could accelerate the conversion of organics into biogas .…”

Section: Applications Of the Microbial Electrolysis Cellmentioning

confidence: 99%

“…73 The external energy optimization (current or voltage) can play a key and very important role in CH 4 product generation. 74 Many studies indicated that combining AD with MEC could accelerate the conversion of organics into biogas. [75][76][77] For instance, Liu et al 75 compared single-and two-chamber MECs at thermophilic conditions and found that the two-chamber configuration could enable CH 4 enrichment (98% CH 4 v/v) in biogas.…”

Section: Production Of Chmentioning

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

View full text Add to dashboard Cite

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

show abstract

Bioelectrochemical methane (CH4) production in anaerobic digestion at different supplemental voltages

Cited by 130 publications

References 36 publications

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

Integration of Membrane Contactors and Bioelectrochemical Systems for CO2 Conversion to CH4

Electro-Fermentation in Aid of Bioenergy and Biopolymers

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

Contact Info

Product

Resources

About