Abstract
The surface flux emissions for volatile organic compounds (VOC’s) (alcohols and aromatic species), priority carbonyls and greenhouse gases, were measured in three different final disposal sites for urban solid waste located in the metropolitan area of Costa Rica, between July and October 2014. The emissions fluxes were determined using the static sampling chamber technique coupled to two different adsorption tubes: active charcoal (Supelco, ORBO 32) to capture BTEX and alcohols; and 2,4-DNPH coated silica gel (SKC, 226-119) for carbonyls. As for the VOCs, the BTEX, Alcohols, and Carbonyls total fluxes were in the range of 3 to 258, 1 to 318 and 0.4 to 8.5 mg/(m2día), respectively. The magnitudes per site were in the following order La Carpio > El Huaso > Rio Azul. Ethanol and BTEX presented a high correlation in all the cases because possibly they are sharing the same sources or formation mechanisms. The emission fluxes spatial distributions among the sites were very variable and dependent on the location of the active cells and their age. Only La Carpio showed a more homogeneous distribution due to its middle age.
Highlights
The surface flux emissions for volatile organic compounds (VOC’s), priority carbonyls and greenhouse gases, were measured in three different final disposal sites for urban solid waste located in the metropolitan area of Costa Rica, between July and October 2014
The fugitive emission fluxes of VOCs, methane and carbon dioxide generated in three waste disposal final sites located in the Metropolitan Area of Costa Rica were measured in order to analyze their temporal and spatial variability
Greenhouse gases include only methane and carbon dioxide; BTEX account for benzene, toluene, ethylbenzene, and xylenes; alcohols for ethanol, 2-propanol and tert-butanol; and the carbonyls include fifteen priority compounds established by USEPA
Summary
In Costa Rica, according to the statistics reported by the Health Secretary, daily about. During the first two stages, the hydrocarbon matrices contained in the organic residue decompose generating the formation of monomers and the fermentation of alcohols which produce volatile fatty acids and esters The continuation of this reaction leads to the formation of acetic acid, hydrogen and carbon dioxide. The direct flux measurement system is based on the static chamber allowing only one time measurements In this technique, a chamber is used to enclose a small surface area at a defined sampling site, while a controlled sweeping zero air flow is introduced at a rate which exceeds the gas release rate from the covered surface. The fugitive emission fluxes of VOCs, methane and carbon dioxide generated in three waste disposal final sites located in the Metropolitan Area of Costa Rica were measured in order to analyze their temporal and spatial variability
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