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Author(s): Juliana V. Teixeira
Sandra Miranda
Ricardo A. R. Monteiro
Filipe V. S. Lopes
Joana Madureira
Gabriela V. Silva
Nazaré Pestana
Eugénia Pinto
Vítor J. P. Vilar
Rui A. R. Boaventura
Title: Assessment of indoor airborne contamination in a wastewater treatment plant
Issue Date: 2013
Abstract: The main objective of this work was to quantify and characterize the major indoor air contaminants present in different stages of a municipal WWTP, including microorganisms (bacteria and fungi), carbon dioxide, carbon monoxide, hydrogen sulfide ammonia, formaldehyde, and volatile organic compounds (VOCs). In general, the total bacteria concentration was found to vary from 60 to > 52,560 colony-forming units (CFU)/m(3), and the total fungi concentration ranged from 369 to 14,068 CFU/m(3). Generally, Gram-positive bacteria were observed in higher number than Gram-negative bacteria. CO2 concentration ranged from 251 to 9,710 ppm, and CO concentration was either not detected or presented a level of 1 ppm. H2S concentration ranged from 0.1 to 6.0 ppm. NH3 concentration was < 2 ppm in most samples. Formaldehyde was < 0.01 ppm at all sampling sites. The total VOC concentration ranged from 36 to 1,724 mu g/m(3). Among the VOCs, toluene presented the highest concentration. Results point to indoor/outdoor ratios higher than one. In general, the highest levels of airborne contaminants were detected at the primary treatment (SEDIPAC 3D), secondary sedimentation, and sludge dehydration. At most sampling sites, the concentrations of airborne contaminants were below the occupational exposure limits (OELs) for all the campaigns. However, a few contaminants were above OELs in some sampling sites.
Subject: Ciências Tecnológicas, Ciências da terra e ciências do ambiente
Technological sciences, Earth and related Environmental sciences
Scientific areas: Ciências exactas e naturais::Ciências da terra e ciências do ambiente
Natural sciences::Earth and related Environmental sciences
Related Information: info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Programa de Financiamento Plurianual de Unidades de I&D/PEst-C/EQB/LA0020/2011/Projeto Estratégico-LA 20 - 2011-2012/LA 20
info:eu-repo/grantAgreement/FCT - Fundação para a Ciência e Tecnologia/Projectos de I&DT em Todos os Domínios Científicos/PTDC/EQU-EQU/100554/2008/AIRPHOTOXI-DESTOXIFICAÇÃO SOLAR DE AR INTERIOR: BIOAEROSSÓIS E COVs/AIRPHOTOXI
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FCUP - Artigo em Revista Científica Internacional
FEUP - Artigo em Revista Científica Internacional
FFUP - Artigo em Revista Científica Internacional

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