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Methanogen

About: Methanogen is a research topic. Over the lifetime, 1146 publications have been published within this topic receiving 48254 citations.


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Patent
08 Jul 2015
TL;DR: In this paper, an anode electrode surface is attached with electroactive acetogen Geobacter metallireducens, and a cathode surface is either associated with a hybrid electroactive methanogen or with an electric battery.
Abstract: The invention provides a method and device for co-production of methane by electrically assisted conversion of ethanol into acetic acid. An anode electrode surface is attached with electroactive acetogen Geobacter metallireducens, a cathode electrode surface is attached with electroactive methanogen or hybrid electroactive methanogen. An oxygen removed ethanol-containing solution is injected into a microbial electrolytic tank to serve as the nutrient source of anode electricigen growth, the anode electroactive acetogen metabolizes ethanol and generates acetic acid, and simultaneously generates H and electrons, at the same time under electrical assistance and electroactive methanogen catalysis, carbon dioxide is reduced into methane by the produced H and electrons. The electrodes involves in the invention have no need of using expensive catalyst, the cost is low, the energy consumption is low, and methane can be produced while converting ethanol into acetic acid, thus providing a new way for acetic acid production and carbon dioxide resource utilization, and having important significance for energy saving and emission reduction, as well as environmental governance.

3 citations

Patent
24 Jan 2008
TL;DR: In this article, the authors proposed an anaerobic fermentation method capable of preventing the oxidation stress in particular from imparting while keeping an enough an-aerobic atmosphere and obtaining fermentation gas (bio-gas) of further higher calorie (high methane concentration) in a high yield by activating methanogen.
Abstract: PROBLEM TO BE SOLVED: To provide an anaerobic fermentation method capable of preventing the oxidation stress in particular from imparting while keeping an enough anaerobic atmosphere, and obtaining fermentation gas (bio-gas) of further higher calorie (high methane concentration) in a high yield by activating methanogen. SOLUTION: In this anaerobic fermentation method, when charging biomass raw material into an anaerobic fermentation tank, a radical collecting agent eliminating oxidation stress of the methanogen or hydrogen producing bacteria and/or a substance forming the radical collecting agent in the anaerobic fermentation tank, is added to the anaerobic fermentation tank or biomass raw material, to perform the anaerobic fermentation method. COPYRIGHT: (C)2008,JPO&INPIT

3 citations

Journal ArticleDOI
01 Jun 2022-Energy
TL;DR: In this paper , the potential to produce biomethane by means of an Anaerobic sequential batch Reactor used to process two types of slaughterhouse wastes: raw slaughterhouse wastewaters and a sludge obtained after a specific treatment.

3 citations

01 Jan 2004
TL;DR: In this article, a survey of the methanogen esis by endosymbiotic methanogens in four different Dutch freshwater sediments was conducted, where the abundance of anaerobic protozoa, in particular cili ates, the methane production rates by the ecosystem and by the protists, and other abiotic parameters were measured.
Abstract: Summary. Biogenic methane contributes substantially to the atmospheric methane concentration and thus to global warming. This trace gas is predominantly produced by strictly anaerobic methanogenic archaea, which thrive in the most divergent ecological niches, e. g. paddy fields, sediments, landfills, and the digestive tract of various animals. Methanogenic archaea also live as endosymbionts in th e cytoplasm of anaerobic protozoa. In marine sediments these endosymbionts can contribute up to 90% to the overall rate of methanogenesis, whereas their role of in freshwater sediments is largely unknown. Here we describe the results of a one year’s survey of the methanogen esis by endosymbiotic methanogens in four different Dutch freshwater sediments. The abundance of anaerobic protozoa, in particular cili ates, the methane production rates by the ecosystem and by the protists, and a number of abiotic parameters were measured. A novel method (heatshock for 5 min) for estimating the contribution by endosymbiotic methanogens was established. Our results reveal large fluctua tions of ciliate abundance throughout the year, but on average, only minor contributions by methanogenic endosymbionts to the total meth anogenesis in these environments.

3 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the effect of catalysts on the performance of anaerobic digestion (AD) by using wet air oxidation (WAO) with the addition of K2CO3 as a catalyst.
Abstract: Hydrothermal pretreatment (HTP) of sewage sludge (SS) has been shown to improve the subsequent biogas production by anaerobic digestion (AD), but the effect of catalysts on HTP performance was less explored. This study intended to investigate the SS pretreatment by wet air oxidation (WAO) with the addition of K2CO3 as a catalyst on the performance of methane production by AD. WAO was found to improve the solubilization of SS, the soluble chemical oxygen demand, dissolved organic carbon, and total dissolved nitrogen. The methane yield from WAO increased from 202 mL/gVSin with no catalyst added to 277 mL/gVSin with 10 wt% of K2CO3 added at 180 °C with 30 min of residence time. Under this pretreatment condition, the highest methane production rate could achieve 15.8 mL/gVSin day, and the percentage of methane reached 73%. The structure of the microbial community involved in the AD was affected by the residence time, working gas, and catalyst of the HTP process. The results showed that Bacteroidetes, Bacteroidia, and SC103 were the dominant phylum, class, and genus of bacteria, respectively, of almost all of the samples. In addition, the most abundant archaeal order was Methanosarcinales, while Methanosaeta was the dominant archaeal genus of most of the samples. However, Methanosarcina largely increased the relative abundance, corresponding to the amount of K2CO3 catalyst used. The findings in this study demonstrated the potential use of K2CO3 during WAO of SS and implied the link between shift of methanogen community and the enhanced methane yield in AD.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202379
2022139
202189
202067
201974
201863