Suppression of methanogenesis for hydrogen production in single-chamber microbial electrolysis cells using various antibiotics

Recovery of biohydrogen in a single-chamber microbial electrohydrogenesis cell using liquid fraction of pressed municipal solid waste (LPW) as substrate

“…These observations point to a need for more efficient strategies over pH adjustment to prevent methanogenesis from the perspective of maximizing biohydrogen production from the LPW. So as to suppress methanogenesis, Catal et al [10] have employed various inhibitors such as neomycin (NS), bromoethanesulfonate (BES), chloroethanesulfonate (CES) and hypoxanthine (AHX). It also should be stressed that besides the cathodic electroactive cells, another responsible factor limiting cathodic hydrogen efficiencies might be the deposition of various inorganic salts (e.g.…”

“…Microbial electrolysis cell (MEC) is a lately designed biotechnological device that can reduce carbon dioxide for the generation of multi-carbon biofuels such as methane, acetate, etc. (called electromethangenesis) [8,9], or utilize organic matters in wastewater to form hydrogen (referred to as electrohydrogenesis) [10]. In an electrohydrogenesis MEC process, anode respiring bacteria (ARB, or exoelectrogens) populated at the anodic biofilms decompose organic substances into bicarbonate, protons and electrons [11]; the electrons by means of a small energy input, in addition to that (-0.3 V) produced by ARB, are transferred to the cathode and react with protons, generating H 2 via the hydrogen evolution reaction (HER): 2H + + 2e -→ H 2 (g) (-0.42 V at pH 7) [3,12].…”

Hydrogen Production from Makgeolli Wastewater Using a Single‐Chamber Microbial Electrolysis Cell

“…Since the main goal of MECs is hydrogen, the methane production needs to be suppressed. Several approaches have been proposed for enhancing hydrogen portion in a produced gas mixture by inhibiting methanogens which include exposure to air, heat shock, using antibiotics, ultraviolet irradiation, and treating with acetylene gas …”

A Solar‐driven Microbial Electrolysis Cell for Hydrogen Production from Acetate with Minimal CO2 and CH4 Emission Using p‐Type Cu2O Nanoparticles

“…The initial high rate of H 2 production is soon taken over by CH 4 production. Although several different methods to suppress methanogenesis have been developed, they are not properly suited to the practical application …”

“…It is therefore mandatory to solve this problem in order that MECs find an application in a real world. Several methods suppressing methanogens have been suggested which include chemical treatment or heat shocking . Our solar‐driven MEC system, however, does not require those treatments.…”