Carbon dioxide and methane emission of denitrification bioreactor filling waste sawdust and industrial sludge for treatment of simulated agricultural surface runoff

2021 ◽  
Vol 289 ◽  
pp. 112503
Author(s):  
Hongbing Luo ◽  
Daiwei Zhuang ◽  
Jinping Yang ◽  
Xiaoling Liu ◽  
Ke Zhang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Methane Emission ◽  
Surface Runoff ◽  
Industrial Sludge ◽  
Denitrification Bioreactor

scholarly journals Environmental controls on ecosystem-scale cold-season methane and carbon dioxide fluxes in an Arctic tundra ecosystem

2020 ◽  
Vol 17 (15) ◽  
pp. 4025-4042
Author(s):  
Dean Howard ◽  
Yannick Agnan ◽  
Detlev Helmig ◽  
Yu Yang ◽  
Daniel Obrist
Keyword(s):  
Carbon Dioxide ◽  
Methane Emission ◽  
Arctic Tundra ◽  
Cold Season ◽  
The Arctic ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Carbon Dioxide Fluxes ◽  
Soil Temperatures ◽  
Annual Total

Abstract. Understanding the processes that influence and control carbon cycling in Arctic tundra ecosystems is essential for making accurate predictions about what role these ecosystems will play in potential future climate change scenarios. Particularly, air–surface fluxes of methane and carbon dioxide are of interest as recent observations suggest that the vast stores of soil carbon found in the Arctic tundra are becoming more available to release to the atmosphere in the form of these greenhouse gases. Further, harsh wintertime conditions and complex logistics have limited the number of year-round and cold-season studies and hence too our understanding of carbon cycle processes during these periods. We present here a two-year micrometeorological data set of methane and carbon dioxide fluxes, along with supporting soil pore gas profiles, that provide near-continuous data throughout the active summer and cold winter seasons. Net emission of methane and carbon dioxide in one of the study years totalled 3.7 and 89 g C m−2 a−1 respectively, with cold-season methane emission representing 54 % of the annual total. In the other year, net emission totals of methane and carbon dioxide were 4.9 and 485 g C m−2 a−1 respectively, with cold-season methane emission here representing 82 % of the annual total – a larger proportion than has been previously reported in the Arctic tundra. Regression tree analysis suggests that, due to relatively warmer air temperatures and deeper snow depths, deeper soil horizons – where most microbial methanogenic activity takes place – remained warm enough to maintain efficient methane production whilst surface soil temperatures were simultaneously cold enough to limit microbial methanotrophic activity. These results provide valuable insight into how a changing Arctic climate may impact methane emission, and highlight a need to focus on soil temperatures throughout the entire active soil profile, rather than rely on air temperature as a proxy for modelling temperature–methane flux dynamics.

A Study on Methane Emissions and Its Mitigation Strategies in Present Scenario

2016 ◽  
Vol 8 (02) ◽  
pp. 87-92 ◽  
Author(s):  
Virendra Kumar ◽  
Swati SachdevSanjeev Kumar ◽  
Sanjeev Kumar
Keyword(s):  
Carbon Dioxide ◽  
Organic Matter ◽  
Global Warming ◽  
Methane Emission ◽  
Energy Production ◽  
Fossil Fuels ◽  
Mitigation Strategies ◽  
Anthropogenic Sources ◽  
Negative Effects ◽  
Methane Generation

Methane is an important gas of earth's environment. It emits from various naturally as well as anthropogenic sources and responsible for maintaining earth's global temperature favorable for humans and other organisms to live. In recent years many activities of human development led to generation of a large volume of methane which has exhibited catastrophic effect on humans as well as animal lives on earth. Methane poses high global warming potential and has been found second most abounded gas in the environment responsible for global warming of earth after carbon dioxide which is well documented in gigantic body of literature. Methane emission is projected to reach 254 Gg/ year by the year 2025. The sources of methane generation are scattered in nature that includes marshes, paddy crops, landfills and natural anaerobic decomposition of the organic matter present in the environment and digestion in ruminants as well handling and use of fossil fuels. The versatile sources of methane generation are uncontrolled and tough to be tamed. However, its emissions and negative effects could be reduced by effectively and efficiently managing its sources of emission and utilizing generated volume for energy production. This study emphasize on the harmful as well as beneficial aspects of the methane, its utilization and strategies to control emission from various sources.

scholarly journals Carbon exchange between the atmosphere and subtropical forested cypress and pine wetlands

2014 ◽  
Vol 11 (11) ◽  
pp. 15753-15791
Author(s):  
W. B. Shoemaker ◽  
J. G. Barr ◽  
D. B. Botkin ◽  
S. L. Graham
Keyword(s):  
Carbon Dioxide ◽  
Methane Emission ◽  
Vegetation Index ◽  
Overland Flow ◽  
Net Ecosystem Exchange ◽  
Forested Wetland ◽  
Carbon Dioxide Exchange ◽  
Cypress Swamp ◽  
Ch4 Production ◽  
Carbon Dioxide Co2

Abstract. Carbon dioxide exchange between the atmosphere and forested subtropical wetlands is largely unknown. Here we report a first step in characterizing this atmospheric–ecosystem carbon (C) exchange, for cypress strands and pine forests in the Greater Everglades of Florida as measured with eddy covariance methods at three locations (Cypress Swamp, Dwarf Cypress and Pine Upland) for one year. Links between water and C cycles are examined at these three sites, and methane emission measured only at the Dwarf Cypress site. Each forested wetland showed net C uptake (retained in the soil and biomass or transported laterally via overland flow) from the atmosphere monthly and annually. Net ecosystem exchange (NEE) of carbon dioxide (CO2) (difference between photosynthesis and respiration, with negative values representing net ecosystem uptake) was greatest at the Cypress Swamp (−1000 g C m-2 year-1), moderate at the Pine Upland (−900 g C m-2 year-1), and least at the Dwarf Cypress (−500 g C m-2 year-1). Methane emission was a negligible part of the C (12 g C m-2 year-1) budget when compared to NEE. However, methane (CH4) production was considerable in terms of global warming potential, as about 20 g CH4 emitted per m2 year was equivalent to about 500 g CO2 emitted per m2 year}. Changes in NEE were clearly a function of seasonality in solar insolation, air temperature and water availability from rainfall. We also note that changes in the satellite-derived enhanced-vegetation index (EVI) served as a useful surrogate for changes in net and gross atmospheric–ecosystem C exchange at these forested wetland sites.

scholarly journals Environmental controls on ecosystem-scale cold season methane and carbon dioxide fluxes in an Arctic tundra ecosystem

2019 ◽  
Author(s):  
Dean Howard ◽  
Yannick Agnan ◽  
Detlev Helmig ◽  
Yu Yang ◽  
Daniel Obrist
Keyword(s):  
Carbon Dioxide ◽  
Methane Emission ◽  
Arctic Tundra ◽  
Cold Season ◽  
The Arctic ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Carbon Dioxide Fluxes ◽  
Soil Temperatures ◽  
Annual Total

Abstract. Understanding the processes that influence and control carbon cycling in Arctic tundra ecosystems is essential for making accurate predictions about what role these ecosystems will play in potential future climate change scenarios. Particularly, air–surface fluxes of methane and carbon dioxide are of interest as recent observations suggest that the vast stores of soil carbon found in the Arctic tundra are becoming more available to release to the atmosphere in the form of these greenhouse gases. Further, harsh wintertime conditions and complex logistics have limited the number of year-round and cold season studies and hence too our understanding of carbon cycle processes during these periods. We present here a two-year micrometeorological data set of methane and carbon dioxide fluxes that provides near-continuous data throughout the active summer and cold winter seasons. Net emission of methane and carbon dioxide in one of the study years totalled 3.7 and 89 g C m−2 a−1 respectively, with cold season methane emission representing 54% of the annual total. In the other year, net emission totals of methane and carbon dioxide were 4.9 and 485 g C m−2 a−1 respectively, with cold season methane emission here representing 82 % of the annual total – a larger proportion than has been previously reported in the Arctic tundra. Regression tree analysis suggests that, due to relatively warmer air temperatures and deeper snow depths, deeper soil horizons – where most microbial methanogenic activity takes place – remained warm enough to maintain efficient methane production whilst surface soil temperatures were simultaneously cold enough to limit microbial methanotrophic activity. These results provide valuable insight into how a changing Arctic climate may impact methane emission, and highlight a need to focus on soil temperatures throughout the entire active soil profile, rather than rely on air temperature as a proxy for modelling temperature–methane flux dynamics.

scholarly journals Analysis on the Influencing Factors of Methane Emission from Wetlands

2021 ◽  
Vol 943 (1) ◽  
pp. 012006
Author(s):  
Yueqiao Liu
Keyword(s):  
Carbon Dioxide ◽  
Single Molecule ◽  
Methane Emission ◽  
Methane Production ◽  
Scientific Community ◽  
Value Added ◽  
Oxidation Processes ◽  
Water Ph ◽  
Main Factors ◽  
Influence Degree

Abstract Methane research has attracted much attention of the scientific community, not only in that its contribution to global warming is second only to carbon dioxide, but also because the value-added potential of single molecule methane is 15-30 times that of carbon dioxide. As a unique ecosystem, wetland is the “source” of methane (CH4), which is an important greenhouse gas in the atmosphere. Methane emission from wetlands is the result of the combined effects of methane production, transport and oxidation processes, in which methane production is the prerequisite for methane emission. This paper studied the effects of different factors on methane production in wetlands, including methanogens and methanotrophs, substrate, temperature, soil water, pH, and vegetation, in order to find out the main factors that affect methane emission from wetlands and their influence degree so that could provide some reference for the estimation and prediction of global greenhouse effect.

EVALUATION OF CARBON DIOXIDE AND METHANE EMISSION FROM CLUJ-NAPOCA MUNICIPAL LANDFILL, ROMANIA

2015 ◽  
Vol 14 (6) ◽  
pp. 1389-1398 ◽  
Author(s):  
Nicolae Frunzeti ◽  
Gabriela-Emilia Popita ◽  
Artur Ionescu ◽  
Adina-Laura Lazar ◽  
Calin Baciu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Methane Emission ◽  
Municipal Landfill

Shadow economy, institutions and environmental pollution: insights from Africa

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
James Temitope Dada ◽  
Folorunsho Monsur Ajide ◽  
Akinwumi Sharimakin
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Environmental Pollution ◽  
Environmental Quality ◽  
Methane Emission ◽  
Shadow Economy ◽  
Institutional Quality ◽  
Content Type ◽  
Per Capita

PurposeThis study investigates the effect of shadow economy on environmental pollution and the role of institutional quality in moderating the impact in African countries between 1991 and 2015.Design/methodology/approachThe study employs three pollutant variables namely: carbon dioxide emissions per capita, methane emission and nitrous oxide emission as robustness check. Also, battery of methodologies; ordinary least squares, fixed effects and system generalised method of moments are used to drive out the conclusions of this study.FindingsThe findings reveal that shadow economy and institutional quality contribute significantly to environmental pollution in Africa. Further, the interactive effect of shadow economy and institutional quality worsens environmental quality in the region. This reveals that weak institutional quality recorded in the region increases the level of shadow economy, thereby intensifying environmental pollution.Practical implicationsThe study concludes that weak institutional framework in the region reinforces shadow economy and environmental pollution. Hence, findings from this study can help policymakers in the region to better understand the role of institutional quality in reducing shadow economy and environmental pollution.Originality/valueThis study enriches one’s understanding on the role of institutional quality in the relationship between environmental quality and shadow economy in African context. It investigates the direct and indirect impact of institutions and shadow economy on environmental quality. The study also uses three different robust variables to measure environmental pollution (carbon dioxide (CO2) emissions per capita, methane emission and nitrous oxide emission) for sensitivity analysis.

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