scholarly journals Estimating methane production rates in bogs and landfills by deuterium enrichment of pore water

2001 ◽  
Vol 15 (4) ◽  
pp. 967-975 ◽  
Author(s):  
D. I. Siegel ◽  
J. R. Chanton ◽  
P. H. Glaser ◽  
L. S. Chasar ◽  
D. O. Rosenberry
Keyword(s):  
Pore Water ◽  
Methane Production ◽  
Production Rates ◽  
Deuterium Enrichment

Modelling the long-term effect of wastewater compositions on maximum sulfide and methane production rates of sewer biofilm

2018 ◽  
Vol 129 ◽  
pp. 58-65 ◽  
Author(s):  
Jing Sun ◽  
Bing-Jie Ni ◽  
Keshab Raj Sharma ◽  
Qilin Wang ◽  
Shihu Hu ◽  
...  
Keyword(s):  
Methane Production ◽  
Term Effect ◽  
Production Rates ◽  
Long Term Effect

Study of Methane Production by High Temperature Anaerobic Fermentation of Chicken Manure and Stalks

2020 ◽  
Vol 14 (4) ◽  
pp. 551-557
Author(s):  
Yongku Li ◽  
Xiaomin Hu ◽  
Lei Feng
Keyword(s):  
High Temperature ◽  
Anaerobic Digestion ◽  
Production Rate ◽  
Methane Production ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Gas Production ◽  
Chicken Manure ◽  
Biogas Slurry ◽  
Production Rates

The changing parameters, as the biogas production rate, the methane production rate, the cumulative biogas amount, the cumulative methane amount, the biogas composition, pH etc. in high temperature anaerobic fermentation of chicken manure and stalks were analyzed by experiments with different mass ratios of chicken manure or livestock manure and stalks with a high C/N ratio. The methane production mechanism of high temperature anaerobic digestion of chicken manure and stalks was discussed in detail. It showed that not only the biogas production rates but also the methane production rates of R1–R7 demonstrated the trend of initial increase and then decrease after 50 d of high temperature anaerobic digestion. Besides, the gas production of R1 with pure chicken manure stopped on the 30th d of the reaction. The gas production of other groups R2–R7 also stopped on the corresponding 34th, 36th, 36th, 37th, 37th, and 37th day, respectively. At the end of the reaction, the cumulative biogas amounts and the cumulative methane amounts of R1–R7 were 411.58 and 269.54, 459.91 and 314.41, 425.32 and 294.11, 401.85 and 272.54, 382.63 and 257.07, 363.04 and 218.16, and 257.15 and 160.10 N ml/(g VS). The biogas slurry pH of R1–R7 all demonstrated a trend of initial decrease and then increase, e. g., pH of R2 reached the minimum of 5.94 on the 5th day. pH values of other groups were between 6.01 and 6.39. After the addition of 4 g of sodium bicarbonate on the 7th day, biogas slurry pH of R1–R7 all increased. pH was maintained between 7.16 and 7.44 until the end of the reaction.

scholarly journals Microbial methane production rates in gas hydrate-bearing sediments from the eastern Nankai Trough, off central Japan

2009 ◽  
Vol 43 (5) ◽  
pp. 315-321 ◽  
Author(s):  
HIDEYOSHI YOSHIOKA ◽  
SUSUMU SAKATA ◽  
BARRY A. CRAGG ◽  
R. JOHN PARKES ◽  
TETSUYA FUJII
Keyword(s):  
Gas Hydrate ◽  
Methane Production ◽  
Nankai Trough ◽  
Production Rates ◽  
Central Japan ◽  
Hydrate Bearing Sediments

Methane production in the rumen and lower gut of sheep given lucerne chaff: effect of level of intake

1978 ◽  
Vol 39 (2) ◽  
pp. 337-345 ◽  
Author(s):  
R. M. Murray ◽  
A. M. Bryant ◽  
R. A. Leng
Keyword(s):  
Organic Matter ◽  
Fatty Acid ◽  
Medicago Sativa ◽  
Isotope Dilution ◽  
Methane Production ◽  
Volatile Fatty Acid ◽  
Significant Contribution ◽  
Production Rates ◽  
End Products ◽  
Low Levels

1. Methane production rates were estimated simultaneously in the rumen and caecum of sheep given 200, 400, 600, 800 and 1000 g lucerne (Medicago sativa) chaff/d using isotope dilution techniques. Estimates were also made of volatile fatty acid (VFA) production in the rumen at each level of feeding. In all studies three to four animals were used at each level of intake.2. Production of VFA and of methane were both related to digestible energy (de) intake. Regression lines for both VFA production and methane production v.de intake had significant intercepts indicating an input of endogenous, fermentable organic matter into the rumen in excess of 50 g/d.3. The values obtained for rates of methane production were compared with those calculated from stoicheiometric equations relating rates of methane and VFA production. Comparisons of methane production with that predicted from de intake were also made.4. Balances for digestion of food determined for the rumen indicated that the energies in the end-products were more than 100% of the de intakes at low intakes of lucerne chaff. Correction for fermentation of apparent endogenous materials resulted in more realistic values. Endogenous materials appeared to make a significant contribution to VFA and methane production, particularly at low levels of intake.

scholarly journals A two-dimensional model of the passive coastal margin deep sedimentary carbon and methane cycles

2012 ◽  
Vol 9 (8) ◽  
pp. 2859-2878 ◽  
Author(s):  
D. E. Archer ◽  
B. A. Buffett ◽  
P. C. McGuire
Keyword(s):  
Organic Carbon ◽  
Pore Water ◽  
Continental Margin ◽  
Methane Production ◽  
Production Efficiency ◽  
Dissolved Inorganic Carbon ◽  
Carbon Isotopic Composition ◽  
Scale Model ◽  
Dimensional Model ◽  
Sediment Column

Abstract. We present a new geologic-time and basin-spatial scale model of the continental margin methane cycle. The model, SpongeBOB, is used to simulate evolution of the carbon cycle in a passive sedimentary continental margin in response to changing oceanographic and geologic forcing over a time scale of 200 million years. The geochemistry of the sediment column is altered by the addition of vertical high-permeability channels intended to mimic the effects of heterogeneity in the real sediment column due to faults, and produces results consistent with measured pore-water tracers SO42− and 129I. Pore water dissolved inorganic carbon (DIC) concentrations are consistent with chemical weathering (CaCO3 formation from igneous rocks) at depth within the sediment column. The carbon isotopic composition of the DIC is consistent with a methane production efficiency from particulate organic carbon (POC) of 50%, which is somewhat lower than redox balance with the H / C of organic matter in the model. The hydrate inventory in the model is somewhat less sensitive to temperature than our previous results with a one-dimensional model, quite sensitive to reasonable changes in POC, and extremely sensitive to the ability of methane bubbles to rise within the sediment column, and how far gas-phase methane can get through the sediment column before it redissolves when it reaches undersaturated conditions. Hydrate formation is also sensitive to deep respiration of migrating petroleum. Other phenomena which we simulated had only a small impact on the hydrate inventory, including thermogenic methane production and production/decomposition of dissolved organic carbon.

Comparative study of methanogens in one- and two-stage anaerobic digester treating food waste

2014 ◽  
Vol 30 (6) ◽  
pp. 515-523 ◽  
Author(s):  
Marta Kinnunen ◽  
Daniel Hilderbrandt ◽  
Stefan Grimberg ◽  
Shane Rogers ◽  
Sumona Mondal
Keyword(s):  
Food Waste ◽  
Methane Production ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Quantitative Polymerase Chain Reaction ◽  
Methanogenic Archaea ◽  
Pilot Scale ◽  
Shannon Index ◽  
Production Rates ◽  
Two Stage ◽  
One Stage

AbstractChanges in methanogenic archaea were investigated in pilot-scale experiments during one- and two-stage mesophilic anaerobic digestion (AD) of food waste. Methane yields were 379.7±75.3 liters of methane per kg of volatile solids [L-CH4(kg-VS)−1] added to the system, during one-stage operation, and 446±922 L-CH4(kg-VS)−1added during two-stage operation. Populations of methanogenic archaea were monitored quantitatively by targeting the functional gene for methyl-coenzyme-M reductase (mcrA) using real-time quantitative polymerase chain reaction techniques. During one-stage operation, meanmcrAgene concentrations were 2.48×109±2.7×109copies ml−1. Two-stage operation yielded meanmcrAgene concentrations of 9.85×108±8.2×108copies ml−1in the fermentation and 1.76×1010±8.5×109copies ml−1in the methanogenesis reactors, respectively. Diversity of archaea in the methanogenic reactors was investigated by denaturing gradient gel electrophoresis targeting the V3 region of 16S rRNA of archaea. The Shannon index (H) was 2.98 for one-stage operation and 7.29 for two-stage operation, suggesting greater archaeal diversity in the two-stage AD. The fivefold increase in methanogenic archaea populations during the two-stage operation, as indicated bymcrAgene concentration, corresponded to an increase in methane production rates. While the diversity may also be related to the stability of the microbial bioprocesses and improved methane production rates, the correlation between diversity and production rates should be studied further.

Microaerophilic treatment enhanced organic matter removal and methane production rates during swine wastewater treatment: A long-term engineering evaluation

2021 ◽  
Vol 180 ◽  
pp. 691-699
Author(s):  
Maurício Guimarães de Oliveira ◽  
José Marcos Marques Mourão ◽  
Ana Katherinne Marques de Oliveira ◽  
André Bezerra dos Santos ◽  
Erlon Lopes Pereira
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Methane Production ◽  
Swine Wastewater ◽  
Production Rates ◽  
Organic Matter Removal

scholarly journals mcrAGene abundance correlates with hydrogenotrophic methane production rates in full-scale anaerobic waste treatment systems

2015 ◽  
Vol 62 (2) ◽  
pp. 111-118 ◽  
Author(s):  
R.L. Morris ◽  
V.P. Tale ◽  
P.P. Mathai ◽  
D.H. Zitomer ◽  
J.S. Maki
Keyword(s):  
Methane Production ◽  
Waste Treatment ◽  
Full Scale ◽  
Production Rates
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