scholarly journals Technologies for Biogas Upgrading to Biomethane: A Review

2019 ◽  
Vol 6 (4) ◽  
pp. 92 ◽  
Author(s):  
Adnan ◽  
Ong ◽  
Nomanbhay ◽  
Chew ◽  
Show
Keyword(s):  
Carbon Dioxide ◽  
Fossil Fuels ◽  
Process Integration ◽  
State Of The Art ◽  
Management Policy ◽  
Biological Processes ◽  
Future Perspectives ◽  
Biogas Upgrading ◽  
Waste Management Policy

The environmental impacts and high long-term costs of poor waste disposal have pushed the industry to realize the potential of turning this problem into an economic and sustainable initiative. Anaerobic digestion and the production of biogas can provide an efficient means of meeting several objectives concerning energy, environmental, and waste management policy. Biogas contains methane (60%) and carbon dioxide (40%) as its principal constituent. Excluding methane, other gasses contained in biogas are considered as contaminants. Removal of these impurities, especially carbon dioxide, will increase the biogas quality for further use. Integrating biological processes into the bio-refinery that effectively consume carbon dioxide will become increasingly important. Such process integration could significantly improve the sustainability of the overall bio-refinery process. The biogas upgrading by utilization of carbon dioxide rather than removal of it is a suitable strategy in this direction. The present work is a critical review that summarizes state-of-the-art technologies for biogas upgrading with particular attention to the emerging biological methanation processes. It also discusses the future perspectives for overcoming the challenges associated with upgradation. While biogas offers a good substitution for fossil fuels, it still not a perfect solution for global greenhouse gas emissions and further research still needs to be conducted.

Carbon Dioxide and the Environment: A Problem of Uncertainty

1985 ◽  
Vol 28 (2) ◽  
pp. 60-66
Author(s):  
John Lemons
Keyword(s):  
Carbon Dioxide ◽  
Adverse Effects ◽  
Carbon Cycle ◽  
Long Range ◽  
Scientific Knowledge ◽  
Fossil Fuels ◽  
Energy Use ◽  
Future Generations ◽  
Remedial Action

The combustion of fossil fuels increases atmospheric levels of carbon dioxide. This may cause a long-term warming of the atmosphere. Solutions to the carbon dioxide problem are particularly difficult because adverse effects will be felt by future generations, but remedial action and sacrifices must be made by present generations. Decisions regarding the problem which affect both the immediate and long-range future must be made deliberately or by default in perhaps only 15-20 years, before we are reasonably confident with our knowledge of the problem and before we know whether it will, in fact, occur. Much of the uncertainty involves projections of future energy use, and scientific knowledge of the carbon cycle and the environment.

Long-term ocean oxygen depletion in response to carbon dioxide emissions from fossil fuels

2009 ◽  
Vol 2 (2) ◽  
pp. 105-109 ◽  
Author(s):  
Gary Shaffer ◽  
Steffen Malskær Olsen ◽  
Jens Olaf Pepke Pedersen
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Fossil Fuels ◽  
Oxygen Depletion

Liver transplantation in children: state of the art and future perspectives

2017 ◽  
Vol 103 (2) ◽  
pp. 192-198 ◽  
Author(s):  
Rohit Kohli ◽  
Miriam Cortes ◽  
N D Heaton ◽  
Anil Dhawan
Keyword(s):  
Liver Transplantation ◽  
Liver Transplant ◽  
Healthy Lifestyle ◽  
State Of The Art ◽  
Future Perspectives ◽  
Long Term Follow Up

In this review, we provide a state of the art of liver transplantation in children, as the procedure is now carried out for more than 30 years and most of our paediatric colleagues are managing these patients jointly with liver transplant centres. Our goal for this article is to enhance the understanding of the liver transplant process that a child and his family goes through while explaining the surgical advances and the associated complications that could happen in the immediate or long-term follow-up. We have deliberately introduced the theme that ‘liver transplant is a disease’ and ‘not a cure’, to emphasise the need for adherence with immunosuppression, a healthy lifestyle and lifelong medical follow-up.

scholarly journals Alternative Fuel Vehicles Today and Their Impacts in the Transportation industry

2021 ◽  
Author(s):  
Abdul M. Miraz
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Alternative Fuel ◽  
Transportation Industry ◽  
Alternative Fuel Vehicles ◽  
Pros And Cons ◽  
Fuel Costs

Canadians are concerned about their environment around them, global warming and also related issues regarding this aspect. But on the other hand many donʼt realize that the cars and trucks that they drive are a major source of these problems, and that there are alternative choices of transportation that they can make out there. Majority of us drive or ride in vehicles that are powered by petroleum based fossil fuels i.e. gasoline or diesel. But some people, however, are choosing to drive vehicles that run on smaller amounts of fuel, and/or partially or completely on fuels other than diesel or gasoline. These types of advanced and alternative fuel vehicles (AFVs) help reduce our dependence on foreign oil imports, save us money on fuel costs, and improve our air quality. Alternative fuels nowadays have received some attention as a potential option to curtail the carbon dioxide emissions form vehicles. My project report discusses the feasibility and desirability of the use of alternative fuels as a strategy to mitigate automotive carbon dioxide emissions. For example what types of impact are we to expect in the transportation industry due to alternative fuel vehicles and are they economically feasible to consumers? And what type of long-term benefits do they offer? And if a person is willing to know more about these alternative fuel vehicles that are out in the market, where should they go for more information? It is a type of a summary of all the aspects about alternative fuel vehicles and their pros and cons.

scholarly journals Recent advances on geomorphology of the Gorce Mountains, the Outer Western Carpathians – state-of-the-art and future perspectives

2021 ◽  
Vol 94 (1) ◽  
pp. 47-67
Author(s):  
Paweł Kroh ◽  
Łukasz Pawlik
Keyword(s):  
State Of The Art ◽  
River Channels ◽  
Future Perspectives ◽  
Denudation Rates ◽  
Run Off ◽  
Outer Western Carpathians ◽  
Tree Uprooting ◽  
High Level ◽  
State Of Art

The increase of geomorphological research during the last decades in the Gorce Mts. caused the need for state-of-art review papers. The Gorce Mountains were formed as an isolated massif with Mt Turbacz (1310 m a.s.l.) as the highest summit. River channels are remodeled by sudden and high-level floods with the critical impact of log jams. The main processes influencing hillslope relief were landsliding, run-off, and tree uprooting. The review suggests the following issues await for studies: a long-term landscape evolution, monitoring of morphogenetic processes, and origin of landslides with their contribution to denudation rates. Also, current biomorphodynamics (uprooting process) has not been sufficiently studied.

scholarly journals Alternative Fuel Vehicles Today and Their Impacts in the Transportation industry

2021 ◽  
Author(s):  
Abdul M. Miraz
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Emissions ◽  
Alternative Fuels ◽  
Fossil Fuels ◽  
Alternative Fuel ◽  
Transportation Industry ◽  
Alternative Fuel Vehicles ◽  
Pros And Cons ◽  
Fuel Costs

Canadians are concerned about their environment around them, global warming and also related issues regarding this aspect. But on the other hand many donʼt realize that the cars and trucks that they drive are a major source of these problems, and that there are alternative choices of transportation that they can make out there. Majority of us drive or ride in vehicles that are powered by petroleum based fossil fuels i.e. gasoline or diesel. But some people, however, are choosing to drive vehicles that run on smaller amounts of fuel, and/or partially or completely on fuels other than diesel or gasoline. These types of advanced and alternative fuel vehicles (AFVs) help reduce our dependence on foreign oil imports, save us money on fuel costs, and improve our air quality. Alternative fuels nowadays have received some attention as a potential option to curtail the carbon dioxide emissions form vehicles. My project report discusses the feasibility and desirability of the use of alternative fuels as a strategy to mitigate automotive carbon dioxide emissions. For example what types of impact are we to expect in the transportation industry due to alternative fuel vehicles and are they economically feasible to consumers? And what type of long-term benefits do they offer? And if a person is willing to know more about these alternative fuel vehicles that are out in the market, where should they go for more information? It is a type of a summary of all the aspects about alternative fuel vehicles and their pros and cons.

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