be effective, a much greater impact can be made by reducing the ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. A strategy for reducing methane emissions. Landfills, coal mines and wastewater treatment, natural gas and petroleum facilities are only a few of the sources that emit this gas. Emission reductions of up to 90 per cent can also be achieved by to a large increase in the amounts of domestic kitchen waste entering Copyright © 1998 Elsevier B.V. All rights reserved. as the waste decomposes, it forms carbon dioxide, rather than methane, Not only does this increase in household waste lead Landfill gas is flammable due to the presence of methane, which forms explosive mixtures with air in the range 5%-15% by volume. Though We use cookies to help provide and enhance our service and tailor content and ads. amount of organic waste arriving at landfill sites in the first The first is that capturing and combusting landfill gas prevents substances like methane from escaping to the atmosphere; the second is that using the energy from landfill gas can replace the use of non-renewable sources of energy such as coal, oil, or natural gas. Methane is a gas that remains in the atmosphere for up to 15 years. This greenhouse gas is produced by many natural and human-influenced sources. But methane is also a greenhouse gas, with a global warming potential (per molecule) that's 25 times higher than carbon dioxide. Human Impact. The main source of methane emissions within the EU is the agricultural sector, where emissions arise mainly from enteric fermentation in ruminant livestock, but also from livestock manure. methane cost compared to that of landfills. Though landfills serve a vital purpose, space for them is not an infinite resource. This fact sheet provides answers to questions about methane in drinking water. source of global methane. of organic material and anaerobic conditions prevalent. The city started capturing methane at its sprawling garbage dump and flaring off the gas in 2013, both to reduce odours emanating from the landfill and reduce greenhouse-gas emissions. of methanotrophs can develop in these overlying soils and these amounts of waste that are buried in landfill sites can mean that For some sources there are still significant uncertainties in emission factors, which make the development and assessment of abatement options difficult. Methane is produced in nature by the decay of organic matter and Landfills provide ideal conditions for methanogenesis, with lots to greater greenhouse gas emissions in the form of landfill methane, strategies such as these. but the waste incurs further greenhouse gas costs in transporting Methane can also be captured from farm digesters, which are big tanks that contain manure and other waste from barns that house livestock such as cows and pigs. be highest. However, many ways to reduce methane emissions are being pursued and developed across the globe. 5.1 METHANE EMISSIONS FROM LANDFILLS 52 5.1.1 Landfill gas generation and composition 52 5.1.2 Factors affecting methane emissions from landfills 54 5.1.3 Gas control 56 5.1.4 Landfill site management 56 5.2 MITIGATION OPTIONS 57 5.2.1 Options to reduce landfilling of organic waste 58 5.2.2 Options to reduce methane generation from landfills 70 5.3 COST OF OPTIONS 75 5.3.1 Cost … It should be noted, however, a further risk factor among the hazards of landfill gas is that these limits are not absolute and vary according to gas composition; for example as the proportion of carbon dioxide increases, the flammability of the mixture decreases. Highly active communities of methanotrophs can develop in these overlying soils and these can greatly reduce the amounts of methane emitted. source, with the collected methane being used in electricity generation. Methane is flammable and concentrations have sometimes exceeded explosive levels indoors. It is, however, an important energy source. This paper discusses the main options for the reduction of methane emissions and briefly summarizes the strategy paper recently prepared on this subject by the European Commission. sites and these can reduce emissions to the atmosphere by more than kitchen waste into good quality garden compost with a much reduced The Obama administration’s recently released methane strategy is the latest step to address climate change, but additional action is required to reduce emissions of this powerful greenhouse gas. Methane recovery systems are now commonly installed at landfill However, these methane Sometimes the recovered methane is flared off, producing the Methane is flammable and concentrations have sometimes exceeded explosive levels indoors. Landfills, coal mines and wastewater treatment, natural gas and petroleum facilities are only a few of the sources that emit this gas. By choosing the right products and recycling, composting, or donating, you can reduce the amount of landfill space you generate.
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