Single-chamber microbial electrochemical cell for CH₄production from CO₂utilizing a microbial consortium

Abstract

Summary We report the first single‐chamber microbial electrochemical cell for conversion of CO2 to CH4, with an average CH4 production rate of 0.47 ± 0.05 mL day−1 cm−2 at an applied potential of 600 mV, utilizing a methanogenic microbial community collected from the formation water in the San Juan coal basin (Colorado, USA). CH4 production was only observed at the graphite rod cathode after an electrochemical pre‐treatment that facilitates biofilm formation. The carbon contained within the CH4 arose predominantly from the CO2 source, as verified by experiments during which the CO2 source was repeatedly turned off and on. Modest quantities of acetic acid and ethanol were also produced. DNA extraction and sequencing from the microbial community showed that from the Archaea kingdom, only 2 species survived prolonged exposure to CO2 and CH4 production, methanobacterium sp. (81.4%), and methanoculleus sp. (18.6%), while in the bacterial kingdom, anaerobaculum thermoterrnum (67.1%) was the predominant surviving species.

Energy harvesting from sediment microbial fuel cell to supply uninterruptible regulated power for small devices

“…SMFC worked batch‐wise in anaerobic mode, methane was also obtained either by direct reduction (utilized electron, proton, and CO 2 ) or by indirect reduction (utilized H 2 and CO 2 ) . The organic content in the sediment was measured before and after used in SMFC.…”

“…SMFC worked batch-wise in anaerobic mode, methane was also obtained either by direct reduction (utilized electron, proton, and CO 2 ) or by indirect reduction (utilized H 2 and CO 2 ). 10,24 The organic content in the sediment was measured before and after used in SMFC. Two hundred grams of both sediment samples were taken into two plastic cups and placed into the laboratory for drying.…”

Microbial Electrosynthesis Inoculated with Anaerobic Granular Sludge and Carbon Cloth Electrodes Functionalized with Copper Nanoparticles for Conversion of CO2 to CH4

“…In contrast, the anode chamber is either inoculated with unspecific exoelectrogens or maintained abiotic. The ion exchange membrane prevents oxygen produced at an aerobic anode from diffusing into an anaerobic cathode chamber and inhibits the anaerobic microorganisms in the cathode chamber [ 8 ].…”

Enhanced hydrogen production by mevastatin in microbial electrolysis cells

“…16 The recovery of various matters from wastewater such as phosphorus and ammonium has also been shown. 17,18 MEC technology can also be used to convert carbon dioxide to methane, 19,20 however hydrogen is more preferred because of its higher energy yield. There are several types of MECs mainly single chamber and double chamber MECs.…”