Acúmulo e carreamento de metais pesados e sólidos em superfícies asfálticas
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2014-03-14
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Universidade Federal de Goiás
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This work aimed to quantify the build-up and wash-off pollutants in urban asphalt
surfaces, mainly metals and solids, correlating the pollutant load with dry days, traffic load
and rainfall intensity. The relationship between metals and particle size has been also
evaluated. To do this, three streets with different traffic load as study area in Goiânia City
were selected. The sediments samples were collected in six plots of 0,5 m² located in the
central track of the streets during 14 days, collecting samples on 1°, 2°, 3°, 5°, 7° e 14° dry
days by the vacuuming and sweeping method. For water sampling two rainfall intensities
were selected to be simulated, through a simulated rainfall over an area of 3m², being on low
and other high intensity, respectively 25 mm/h and 115 mm/h both with 15 minutes duration.
Were simulated three events on the same experimental plot in witch study area and collected 5
water samples during witch rainfall event, which were analyzed by concentration of suspend
and dissolved solids, DQO, conductivity and the metals copper, chromium, lead, cadmium,
zinc, iron and manganese, determined by Atomic Absorption Spectroscopy. The results
showed that build-up has a strong direct relationship with dray days and an inverse
relationship with traffic load. For metals in sediments was verified that the higher
concentrations are on particles < 63μm, and follow in general the concentration order Fe >
Mn > Cu > Pb > Zn > Cd > Cr. The runoff water quality was observed that all the parameters
analyzed, except chromium, were detected on selected study areas. The influence of rainfall
intensity on wash-off pollutants was observed that this has fundamental importance, so that
higher intensity wash-off a higher mass of solids and metals.
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SILVA, Emanoelle Pereira da. Acúmulo e carreamento de metais pesados e sólidos em superfícies asfálticas. 2014. 113 f. Dissertação (Mestrado em Engenharia do Meio Ambiente) - Universidade Federal de Goiás, Goiânia, 2014.