1,721,008 research outputs found
Accumulation chamber as control system for long-term gas emission impact of MSW landfilling: Preliminary experimental results and elaborations on Italian provincial scale
No full textProceedings “ISWA Roma 2004 - World Environment Congress"
CD-Rom Proceedings “ISWA Roma 2004”, International Solid Waste Association World Environment Congress and Exhibitio
Non-methane Volatile Organic Compounds (VOCs) at El Chichón volcano (Chiapas, México):Geochemical features, origin and behavior
Full text linkSe presenta un estudio de las características geoquímicas de la fracción orgánica en las fumarolas del volcán Chichón (Estado de Chiapas, México) para obtener información sobre el origen de los compuestos orgánicos volátiles exceptuando el metano (VOCs) y los procesos que rigen su comportamiento. Los VOCs en fumarolas y pozas burbujeantes consisten principalmente de alcanos (C2-C5) cuya abundancia total tiene un orden de magnitud menor que el metano, y concentraciones altas de aromáticos (benceno y tolueno) y C2-C3 alquenos (principalmente propano e iso-butano). Se encontraron también concentraciones significativas de compuestos de azufre substituidos que en su mayoría pertenecen al grupo de los heterocíclicos. Esta composición, similar a la de las emisiones gaseosas relacionadas a sistemas geotérmicos, sugiere que la producción de gases orgánicos en el volcán El Chichón es principalmente debida a procesos termogénicos. La abundancia total de VOCs es relativamente baja en comparación con la composición típica de fluidos hidrotermales, lo que podría estar relacionado a una contribución importante de fluidos de origen magmático al reservorio que alimenta las emisiones termales del cráter. Sin embargo, la ausencia de compuestos de O-substituidos parece indicar que la composición de los fluidos hidrotermales no es afectada por el aporte de especies orgánicas producidas en profundidades someras por la descomposición de material vegetal reciente, como aquél sepultado por los productos de la erupción de 1982.
doi: https://doi.org/10.22201/igeof.00167169p.2009.48.1.10
Biogas flux measurements using the static, not-stationary accumulation chamber method: mapping, classification and selective characterization of dispersions at Italian provincial scale
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Stratigraphy of plinian fall deposits from Vulsini Volcanic District: eruptive parameters and volcano-tectonic implications
No full textEffects of a temporary HDPE cover on landfill gas emissions: Multiyear evaluation with the static chamber approach at an Italian landfill
No full textAccording to the European Landfill Directive 1999/31/EC and the related Italian Legislation (‘‘D. Lgs. No.
36/2003”), monitoring and control procedures of landfill gas emissions, migration and external dispersions
are clearly requested. These procedures could be particularly interesting in the operational circumstance
of implementing a temporary cover, as for instance permitted by the Italian legislation over
worked-out landfill sections, awaiting the evaluation of expected waste settlements.
A possible quantitative approach for field measurement and consequential evaluation of landfill CO2,
CH4 emission rates in pairs consists of the static, non-stationary accumulation chamber technique. At
the Italian level, a significant and recent situation of periodical landfill gas emission monitoring is represented
by the sanitary landfill for non-hazardous waste of the ‘‘Fano” town district, where monitoring
campaigns with the static chamber have been annually conducted during the last 5 years (2005–2009).
For the entire multiyear monitoring period, the resulting CO2, CH4 emission rates varied on the whole
up to about 13,100 g CO2 m2 d1 and 3800 g CH4 m2 d1, respectively.
The elaboration of these landfill gas emission data collected at the ‘‘Fano” case-study site during the
monitoring campaigns, presented and discussed in the paper, gives rise to a certain scientific evidence
of the possible negative effects derivable from the implementation of a temporary HDPE cover over a
worked-out landfill section, notably: the lateral migration and concentration of landfill gas emissions
through adjacent, active landfill sections when hydraulically connected; and consequently, the increase
of landfill gas flux velocities throughout the reduced overall soil cover surface, giving rise to a flowing
through of CH4 emissions without a significant oxidation. Thus, these circumstances are expected to
cause a certain increase of the overall GHG emissions from the given landfill site
Caratterizzazione delle emissioni di biogas da discarica: esperienze e problematiche con metodologia della camera di accumulo (statica, non stazionaria)
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