Emissions of VOC from a Landfill and its Plume Disperison Modelling

Abstract

The main purpose of this work is to evaluate the VOC emissions by a landfill, located at Niteroi city, Rio de Janeiro State, Brazil. Twenty six samples were collected at 500 mL min -1 using a battery-operated air pump during 10 minutes, at four days in May and December, 2009. It was used a cylindrical 30 liters PVC flux chamber, which open bottom side was inserted 5 cm inside the landfill soil, and the samples were collected using a valve at the upper closed side. It were used double bed activated charcoal cartridges and the chemical analyses were done by gas chromatography with a mass spectrometry detector. The results indicated that the landfill contain several chemical compounds, mainly VOC, causing injures to vegetation and human health at the vicinities. The results indicated an elevated value of 1,980 kg km -2 h -1 , when compared with metropolitan areas of São Paulo (38 kg km -2 h -1 ) and Rio de Janeiro (26 kg km -2 h -1 ). It was used a Gaussian dispersion model implemented at ISCSC3 mathematical model to calculate the pollutants diffusion and transport, in order to estimate the concentrations at the neighborhood, using the emissions, meteorological, and topographical data. Maximum values of 525 μg m -3 for VOC were found near 500 m from the landfill. As the landfill will be used for a long time it is necessary to evaluate the possibility to change the location of several schools, churches, residences, and hospitals to avoid the impacts.

VOC Emissions from a Landfill and the Impact ont Tropospheric Ozone

“…Table 1 also shows the total hourly emissions of VOC used in the base case and the output data of the two modelling, which represent hourly concentrations of ozone. Emissions of VOC from the ACMC for the simulation were considered constant throughout the day and the value of 1.980 kg km -2 h -1 [18]. The simulated ozone peak was obtained at 2:00 PM (24.6 μg m -3 ).…”

“…The collections were done using electropolished and evacuated canister and chemical analysis were performed using GC-MS following the methodology TO-15US.EPA. Air samples were collected from the soil of the landfill, as described by Corrêa et al [18]. Briefly, a flow PVC chamber was positioned on the landfill soil and the VOC were sampled using activated charcoal cartridges and analyzed by gas chromatography (Varian 450GC) with mass selective detection (Varian 220).…”

Διερεύνηση Των Επιπτώσεων Της Ποιότητας Του Αέρα Στον Εσωτερικό Χώρο Κτιρίου Μητροπολιτικών Περιοχών Που Χρησιμοποιούν Ευπαθείς Πληθυσμιακές Ομάδες

“…Αν και το ραδόνιο (Rn), είναι ο κυρίαρχοσ ρφποσ ςε αυτοφ του είδουσ τθ ''μετανάςτευςθ'', υπάρχουν και άλλεσ πτθτικζσ οργανικζσ ενϊςεισ εξίςου ςθμαντικζσ αναλόγωσ με το είδοσ του εδάωουσ γφρω από το κτίςμα. Για παράδειγμα αν υπάρχει ζντονο το ςτοιχείο των ςκουπιδιϊν ςτθ γφρω περιοχι, κα ςυμβάλλει ςτισ αυξθμζνεσ τιμζσ των αντιςτοίχων ρφπων (Correa et al, 2010). Τζλοσ, το υπαίκριο εξωτερικό περιβάλλον μπορεί να ςυμβάλει ζμμεςα ςτθ ρφπανςθ εςωτερικοφ αζρα μζςω οργανικϊν ουςιϊν που προζρχονται από πόςιμο νερό.…”