An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
methane; methane production, etc ; Fourier transform infrared spectroscopy; Methanobacterium; Methanosarcina; anaerobic digestion; community structure; methanogens; microalgae; microbial communities; sewage sludge; thermogravimetry; China; Show all 13 Subjects
Abstract:
... To improve methane production from sewage sludge (SS), co-digestion of SS and microalgae (MA) was studied and the application of thermo-alkaline pretreatment to MA was evaluated. The results showed that thermo-alkaline pretreatment at 90°C for 120 min on MA was the optimum pretreatment condition. Furthermore, when the volatile solids (VS) ratio of SS and MA was 1:2, the methane yield reached maxim ...
methane production, etc ; Euryarchaeota; ammonia; anaerobic digestion; biogas; economic performance; energy balance; energy efficiency; pig manure; thermal hydrolysis; China; Show all 11 Subjects
Abstract:
... Anaerobic digestion (AD) of swine manure (SM) commonly shows low biogas output and unsatisfactory economic performance. In this study, thermophilic AD (TAD, 50 ± 1 °C) was combined with thermal hydrolysis pretreatment (THP, 170 °C/10 bar), to investigate its potential for maximizing biogas yield, securing successful digestion and microbial diversity, as well as improving energy balance. Four lab-s ...
methane; methane production, etc ; air; models; population density; wastewater treatment; Show all 6 Subjects
Abstract:
... The methane (CH₄) emissions from urban sources are increasing, and they depend on the processes and technologies applied in each one. Thus, studying them individually to quantify their emissions and understand their behavior to design CH₄ mitigation strategies is meaningful. Although many studies have been carried out in different cities worldwide, the complex methodologies and technologies applie ...
methane; methane production, etc ; Holstein; dairy cattle; milk; models; prediction; Show all 7 Subjects
Abstract:
... Methane emission is not included in the current breeding goals for dairy cattle mainly due to the expense and difficulty in obtaining sufficient data to generate accurate estimates of the relevant traits. While several models have been developed to predict methane emission from milk spectra using reference methane data obtained by the respiration chamber, SF6 and sniffer methods, the prediction of ...
methane; methane production, etc ; catalytic activity; enzymatic reactions; nickel; oxidation; oxidoreductases; Show all 7 Subjects
Abstract:
... Methyl-coenzyme M reductase (MCR) containing a nickel hydrocorphinoid cofactor, F430, is an essential enzyme that catalyzes anaerobic methane generation and oxidation. The active Ni(i) species in MCR converts methyl-coenzyme M (CH₃S–CoM) and coenzyme B (HS–CoB) to methane and heterodisulfide (CoM–S–S–CoB). Extensive experimental and theoretical studies focusing on the substrate-binding cavity incl ...
coalbed methane; methane, etc ; energy; roughness; salinity; shale gas; temperature; wettability; Show all 8 Subjects
Abstract:
... Wettability in the methane (CH₄)–liquid–rock system is a key parameter which determines gas recovery and geo-storage efficiencies. However, there is a lack of an overview over this area; thus, we critically review this parameter from experimental and theoretical perspectives and discuss the impact of pressure and temperature conditions, fluid properties (salinity, ion type, and aqueous versus nona ...
Elliott P. Barnhart; Leslie F. Ruppert; Randy Hiebert; Heidi J. Smith; Hannah D. Schweitzer; Arthur C. Clark; Edwin P. Weeks; William H. Orem; Matthew S. Varonka; George Platt; Jenna L. Shelton; Katherine J. Davis; Robert J. Hyatt; Jennifer C. McIntosh; Kilian Ashley; Shuhei Ono; Anna M. Martini; Keith C. Hackley; Robin Gerlach; Lee Spangler; Adrienne J. Phillips; Mark Barry; Alfred B. Cunningham; Matthew W. Fields
coalbed methane; methane; methane production, etc ; carbon; coal; dissolved gases; environmental science; global carbon budget; methanogens; technology; yeast extract; yeasts; Show all 12 Subjects
Abstract:
... Subsurface microbial (biogenic) methane production is an important part of the global carbon cycle that has resulted in natural gas accumulations in many coal beds worldwide. Laboratory studies suggest that complex carbon-containing nutrients (e.g., yeast or algae extract) can stimulate methane production, yet the effectiveness of these nutrients within coal beds is unknown. Here, we use downhole ...
methane; methane production, etc ; deformation; hydraulic fracturing; models; permeability; process design; sand; Show all 8 Subjects
Abstract:
... In this paper, the Mallik production tests are simulated using our four-phase flow model for an unconsolidated methane hydrate reservoir. Model development was outlined in part 1 of this paper series. The simulations suggest that the unconsolidated hydrate reservoir with sand production behaves like a naturally fracking reservoir. Solid deformation and the resultant permeability have a substantial ...
methane; methane production, etc ; Methanobacteriales; aeration; dairy manure; genes; metabolism; oxygen; technology; Show all 9 Subjects
Abstract:
... In this study, the microbial mechanism of reducing methanogenesis during membrane-covered aerobic composting from solid dairy manure was investigated. An industrial-scale experiment was carried out to compare a static composting group (SC) and a forced aeration composting group (AC) with a semipermeable membrane-covered composting group (MC + AC). The results showed that the semipermeable membrane ...
methane; methane production, etc ; anaerobic digestion; bioenergy; biomass; electrolysis; microbial electrolysis cells; Show all 7 Subjects
Abstract:
... Anaerobic digestion has been recognized as promising technology for bioenergy production, while the bottlenecks including long start up times, low methane contents, and susceptibility toward environmental change attenuate the process benefits. Integrating microbials electrolysis cell (MEC) with anaerobic digestion (AD) has been recognized as a promising strategy for alleviate the performance bottl ...
methane; methane production, etc ; anaerobic digestion; biomass; gas production (biological); macroalgae; models; wastes; Show all 8 Subjects
Abstract:
... Modelling the conversion of residual biomass to renewable fuels is of high relevance to promote the development of effective technological solutions. The present study compares the performance of five different kinetic models (pseudo-first-order kinetics, logistics, modified Gompertz, double-Gompertz, and multi-Gompertz) to describe the cumulative methane production during a low-solids anaerobic d ...
methane; methane production, etc ; earthquakes; seawater; sediment-water interface; sediments; China; Yellow Sea; Show all 8 Subjects
Abstract:
... Sediment is recognized as the largest reservoir and source of methane (CH₄) in the ocean, especially in the shallow coastal areas. To date, few data of CH₄ concentration in sediment have been reported in the China shelf seas. In this study, we measured CH₄ concentration in sediment and overlying seawater columns, and conducted an incubation experiment in the Bohai Sea in May 2017. CH₄ concentratio ...
methane; methane production, etc ; Cyanobacteria; algae; homeostasis; mineralization; orthophosphates; phosphonates; phosphorus; photophase; research; Show all 11 Subjects
Abstract:
... Aquatic ecosystems comprise almost half of total global methane emissions. Recent evidence indicates that a few strains of cyanobacteria, the predominant primary producers in bodies of water, can produce methane under oxic conditions with methylphosphonate serving as substrate. In this work, we have screened the published 2 568 cyanobacterial genomes for genetic elements encoding phosphonate-metab ...
methane; methane production, etc ; Agave tequilana; alkalinity; bagasse; biomass; biotechnology; hydrolysates; lignocellulose; methanogens; Show all 10 Subjects
Abstract:
... BACKGROUND: Valorization of lignocellulosic wastes such as agave bagasse from tequila industries can be enhanced using efficient biomass pretreatments. However, the next challenge requires finding the best process conditions to produce methane and remove chemical oxygen demand (COD) from the pretreatment hydrolysates. In this work, an innovative feeding strategy based on alternating hydraulic rete ...
... Chemical looping oxidative coupling of methane (CLOCM) is a novel process for the selective oxidization of methane to produce C₂₊ hydrocarbons. However, the high activity of oxygen carriers usually promotes the undesired complete or partial oxidation of methane to form large amounts of COₓ. Herein, a series of novel composite oxide carriers of Mg₆MnO₈ doped by heteroatoms (Na, W, and P) are develo ...
methane; methane production, etc ; Bombyx mori; Methanobrevibacter; adults; biotechnology; diet; methanogens; oils; sheep; silkworms; Show all 11 Subjects
Abstract:
... In vitro and in vivo studies were conducted to examine the effect of silkworm pupae oil on methane (CH₄) emission and methanogens diversity. Five graded levels (2, 4, 6, 8 and 10%) of silkworm pupae oil were tested in vitro. Eighteen Mandya adult sheep were divided into three groups. All the animals were fed on similar basal diet except the oil supplementation in test groups. Oil level for supplem ...
methane; methane production, etc ; activated sludge; anaerobic digestion; biodegradability; hydrolysis; inoculum; process design; wastewater; Show all 9 Subjects
Abstract:
... This work investigated the effect of biological hydrolysis (BH) time, biological hydrolysis inoculum (BHI), and sludge bypass (SBP) on the performance of temperature-phased biological hydrolysis (TPBH) in the treatment of waste activated sludge (WAS). Results showed that BH times and BHI significantly affected the hydrolysis and methane production of WAS. The TPBH treated WAS without BHI had achie ...
methane; methane production, etc ; blue carbon; carbon sinks; denitrification; eutrophication; marshes; nitrogen; oxidation; sediments; Show all 10 Subjects
Abstract:
... Coastal wetlands play an important role in nitrogen removal and are a vital blue carbon sink. The produced methane (CH₄) in coastal wetlands has been recently identified as a possible carbon source for denitrification process, providing a significant contribution to coastal nitrogen cycling. However, the in-situ correlation between CH₄ emissions and denitrification rate, as well as their coupling ...
methane; methane production, etc ; Biological Sciences; activation energy; climate; oxidation; paddies; paddy soils; temperature; Show all 9 Subjects
Abstract:
... The global methane (CH₄) budget is based on a sensitive balance between methanogenesis and CH₄ oxidation (aerobic and anaerobic). The response of these processes to climate warming, however, is not quantified. This largely reflects our lack of knowledge about the temperature sensitivity (Q₁₀) of the anaerobic oxidation of CH₄ (AOM)—a ubiquitous process in soils. Based on a ¹³CH₄ labeling experimen ...
methane; methane production, etc ; activated carbon; adsorption; anaerobic digestion; cellulose; corn stover; electron transfer; Show all 8 Subjects
Abstract:
... To comprehensively evaluate the biological and abiotic influence of powdered activated carbon (PAC) on the anaerobic digestion of cornstalk, mesophilic and thermophilic digestion were conducted. Adding PAC (10 g/L) under thermophilic system obtained the maximum cellulose degradation rate and methane yield (MY), which were 57.47% and 128.19 L/kg VS. However, adding same dose of PAC at mesophilic sy ...