Methane gas emission
Biogas, which exists in nature, is a free natural gas fuel. Compost in conventional farming has long been known to exist. Analysis shows that methane is a mixture of various gases, generally containing methane 50 ~ 70%, the rest for carbon dioxide and a small amount of nitrogen, hydrogen and hydrogen sulfide, etc.. Although biogas is an efficient energy source, its main component is methane, and its use has always raised environmental concerns.
Methane is a good fuel, but it is also a worrisome greenhouse gas, ranking second only to carbon dioxide as a greenhouse gas. Compared with air, methane weighs 0.54 and is not easily dissolved in water, making it easy to escape into the atmosphere. The global warming potential (GPW) for methane, measured on a 100-year cycle, is 25 times the same unit of carbon dioxide; On a 20-year period, however, the GPW is 72! When it comes to global warming, methane emissions are as much a problem to face as energy conservation and carbon reduction.
Natural methane emissions can be divided into natural and man-made sources. According to the STATISTICAL methods of the US Environmental Protection Agency (EPA), methane emissions include: wetlands, forest fires, woodlands, intestinal fermentation, landfills, rice cultivation, etc. Wetland and paddy field are natural and man-made factors, so the characteristics of biogas anaerobic can be seen simply. Intestinal fermentations have been the subject of much debate in recent days, thanks to a report by Robert Goodland of the WorldWatch Institute (WWI), which concluded that they account for 51% of global emissions, or 32.564 billion tonnes of co2 equivalent, from livestock and by-products raised by humans. The report cites a number of overlooked emissions, including animal breathing, but the science is inconclusive.
Of course, biogas is only a link of methane emissions, the two do not draw the equal sign, but the use of biogas has made some reminders: first, attention must be paid to the man-made methane may bring problems to the environment, especially the problem of escape, but the function of biomass energy to save carbon emissions doubt; Second, the existing anthropogenic biogas emissions can be utilized in more diversified ways. For example, the biogas treatment in landfill sites can generate electricity, and the livestock farming industry also has considerable energy. The third is that biogas storage and use technologies must be improved to address environmental problems, which could help to move the unit towards systematic development by allowing it to operate independently.
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