Navegando por Autor "MEDEIROS, Adaelson Campelo"

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Acesso aberto (Open Access)
Assessment of surface water in two Amazonian rivers impacted by industrial wastewater, Barcarena City, Pará State (Brazil)
(2011-08) LIMA, Marcelo de Oliveira; SANTOS, Elisabeth Conceição de Oliveira; JESUS, Iracina Maura de; MEDEIROS, Adaelson Campelo; FAIAL, Kelson do Carmo Freitas; ALVES, Claudio Nahum
In 2007, surface waters were collected from 21 sampling points in Barcarena City in Northern Region of Brazil: one sampling point located in a stream that receives discharge of wastewater from a kaolin processing industry and flows into the Curuperê River, three sampling points located near sources that emerge on the left bank and flow into the Curuperê River, nine sampling points in Curuperê River, which flows into the Dendê River, and eight in Dendê River, a tributary on the right bank of the Pará River. For all water samples were quantified 14 physicochemical variables and levels of 12 metals. The results in the points near the sources of the Curuperê River presented physicochemical profile and metal levels which are typical of surface waters being used as reference to compare and identify possible changes in the chemical characteristics of the other sampling points. The comparison between the results obtained for the sources of the Curuperê River and the ones for the point near the discharge of industrial wastewater revealed strong changes in the values of 6 physicochemical variables (pH, electrical conductivity (EC), total dissolved solids (TDS), sulfate (SO4), ammoniacal nitrogen (NH4-N) and salinity) and an increase in magnitude of the levels of four metals (Al, Fe, Mn and Zn). These facts characterized that the wastewaters were discharged into the environment without adequate treatment. Results in other sampling sites showed that these anomalous conditions were also found along the Curuperê and Dendê Rivers, especially during low tide. This chemical characterization of the waters allowed to identify harmful conditions to aquatic ecosystems and potential health risk for the local people, who use the rivers for drinking water, recreation and transportation.
Acesso aberto (Open Access)
Obtenção do IQA para avaliação da qualidade da água em rios dos municípios de Abaetetuba e Barcarena (PA)
(Universidade Federal do Pará, 2012) MEDEIROS, Adaelson Campelo; MENDONÇA, Neyson Martins; http://lattes.cnpq.br/7534816053779593
This study was aimed at assessing the quality of the waters of two rivers called Amazon Arapiranga Murucupi and the municipalities of Abaetetuba and Barcarena respectively, in the State of Pará. For this evaluation, was used as the main tool of the Water Quality Index (WQI) calculated from nine (09) variables. The WQI calculations were performed according to the criteria of SP-CETESB adapted National Sanitation Foundation, USA. This study was conducted in 2009 and included four sampling campaigns involving trimentrais the rainy season and dry, and variables in certain conditions of tide low tide and high tide. From the data of variables and WQIs determined, it was possible to make some comparisons on the quality of the rivers studied and it was applied on these data, descriptive statistics, analytical and multivariate. Descriptive statistics were determined during the rainy season and dry values of mean, standard deviation, minimum and maximum values and coefficient of variation. To verify the significance level and sample distribution of the data generated, was held from the statistical analytical tests of normality and hypotheses respectively, comparing the data of variables and WQIs in the rainy season and dry. The multivariate analysis provided a better assessment of water quality of these two rivers through the analysis of groups. The river conditions presented Arapiranga regular and good quality, recording average values of the rainy season WQIs 48 ± 3.7 and 51 ± 5.6 in the ebb-tide and high tide respectively during the dry season, these values were 48 ± 4.6 (low tide and high) and 55 ± 5.7 (low tide and high). From the values of certain WQIs Murucupi the river, we observed conditions of poor quality, regular and good in those waters, and the average values during the rainy season were 44 ± 9.4 and 51 ± 10.3 (low tide and high), in the dry period, these values were 51 ± 8.3 at low tide and 52 ± 8.6 at high tide.The assessment tools used in this study provided a good view on the quality of water in both rivers, observing in general, that there were differences signifitiva quality for these waters with respect to the comparison between the rainy and dry. It is noticed that the river located in Barcarena / PA, undergoes major anthropogenic influence due to the largest urban area in its vicinity, as in other river in the city of Abaetetuba / PA, this influence is less.