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| Titel |
Monitoring fugitive CH4 and CO2 emissions from a closed landfill at Tenerife, Canary Islands |
| VerfasserIn |
María Asensio-Ramos, Mitchell R. K. Tompkins, Lara A. K. Turtle, Marta García-Merino, Cecilia Amonte, Fátima Rodrígez, Eleazar Padrón, Gladys V. Melián, German Padilla, José Barrancos, Nemesio M. Pérez |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149365
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| Publikation (Nr.) |
 EGU/EGU2017-13705.pdf |
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| Zusammenfassung |
| Solid waste must be managed systematically to ensure environmental best practices. One of
the ways to manage this huge problem is to systematic dispose waste materials in locations
such as landfills. However, landfills could face possible threats to the environment such as
groundwater pollution and the release of landfill gases (CH4, volatile organic compounds,
etc.) to the atmosphere. These structures should be carefully filled, monitored and maintained
while they are active and for up to 30 years after they are closed. Even after years of being
closed, a systematically amount of landfill gas could be released to the atmosphere
through its surface in a diffuse and fugitive form. During the period 1999-2016,
we have studied the spatial-temporal distribution of the surface fugitive emission
of CO2 and CH4 into the atmosphere in a cell in the Arico’s municipal landfill
(0.3 km2) at Tenerife, Canary Islands, Spain. This cell was operative until 2004,
when it was filled and closed. Monitoring these diffuse landfill emissions provides
information of how the closed landfill is degassing. To do so, we have performed 9
gas emission surveys during the period 1999-2016. Surface landfill CO2 efflux
measurements were carried out at around 450 sampling site by means of a portable
non-dispersive infrared spectrophotometer (NDIR) model LICOR Li800 following the
accumulation chamber method. Landfill gases taken in the chamber were analyzed using a
double channel VARIAN 4900 micro-GC. CH4 efflux measurements were computed
combining CO2 efflux measurements and CH4/CO2 ratio in the landfill’s surface gas. To
quantify the total CH4 emission, CH4 efflux contour map was constructed using
sequential Gaussian simulation (sGs) as interpolation method. In general, a decrease in
the CO2 emission is observed since the cell was closed (2004) to the present. The
total CO2 and CH4 diffuse emissions estimated in the 2016 survey were 4.54 ±
0.14 t d−1 and 268.65 ± 17.99 t d−1, respectively. These types of studies provide
knowledge of how a landfill degasses and serves to public and private entities to
establish effective systems for extraction of biogas. This aims not only to achieve
higher levels of controlled gas release from landfills resulting in a higher level of
energy production but also will contribute to minimize air pollution caused by them. |
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