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排序方式: 共有343条查询结果,搜索用时 31 毫秒
291.
A. Carvalho A. Monteiro I. Ribeiro O. Tchepel A.I. Miranda C. Borrego S. Saavedra J.A. Souto J.J. Casares 《Atmospheric environment (Oxford, England : 1994)》2010,44(8):1020-1031
Each summer period extremely high ozone levels are registered at the rural background station of Lamas d'Olo, located in the Northeast of Portugal. In average, 30% of the total alert threshold registered in Portugal is detected at this site. The main purpose of this study is to characterize the atmospheric conditions that lead to the ozone-rich episodes at this site. Synoptic patterns anomalies and back trajectories cluster analysis were performed, for the period between 2004 and 2007, considering 76 days when ozone maximum hourly concentrations were above 200 μg m?3. The obtained atmospheric anomaly fields suggested that a positive temperature anomaly is visible above the Iberian Peninsula. A strong wind flow pattern from NE is observable in the North of Portugal and Galicia, in Spain. These two features may lead to an enhancement of the photochemical production and to the transport of pollutants from Spain to Portugal. In addition, the 3D mean back trajectories associated to the ozone episode days were analysed. A clustering method has been applied to the obtained back trajectories. Four main clusters of ozone-rich episodes were identified, with different frequencies of occurrence: north-westerly flows (11%); north-easterly flows (45%), southern flow (4%) and westerly flows (40%). Both analyses highlight the NE flow as a dominant pattern over the North of Portugal during summer. The analysis of the ozone concentrations for each selected cluster indicates that this northeast circulation pattern, together with the southern flow, are responsible for the highest ozone peak episodes. This also suggests that long-range transport of atmospheric pollutants is the main contributor to the ozone levels registered at Lamas d'Olo. This is also highlighted by the correlation of the ozone time-series with the meteorological parameters analysed in the frequency domain. 相似文献
292.
López Fenández Sonia Amaya Chávez Araceli Serrato Cuevas Rodolfo Gómez Tenorio Germán Roa Morales Gabriela 《Journal of Material Cycles and Waste Management》2023,25(2):1153-1167
Journal of Material Cycles and Waste Management - The aim of this study was to analyze the efficiency of a system of treatment of organic swine waste as a management tool in the transformation of... 相似文献
293.
de Oliveira Maria Rayane Correia de Lima Silva Maria Gabriely Alcântara Isabel Sousa Filho Jaime Ribeiro Tintino Cícera Datiane de Morais Oliveira Magalhães Francisco Ernani Alves Martins Anita Oliveira Brito Pereira Bezerra Pessoa Renata Torres Duarte Antonia Eliene da Costa José Galberto Martins de Lima Sidney Gonçalo Coutinho Henrique Douglas Melo Capasso Raffaele de Menezes Irwin Rose Alencar 《Environment, Development and Sustainability》2021,23(10):14958-14981
Environment, Development and Sustainability - This work aimed to analyze the chemical composition and evaluate the anti-inflammatory and antinociceptive properties of the essential oil obtained... 相似文献
294.
Poliana Cardoso-Gustavson Francine Faia Fernandes Edenise Segala Alves Mariana Pereira Victorio Barbara Baesso Moura Marisa Domingos Caroline Albuquerque Rodrigues Andreza Portella Ribeiro Catarina Carvalho Nievola Ana Maria G Figueiredo 《Environmental science and pollution research international》2016,23(2):1779-1788
295.
Gregor Kalinkat Juliano S. Cabral William Darwall G. Francesco Ficetola Judith L. Fisher Darren P. Giling Marie‐Pierre Gosselin Hans‐Peter Grossart Sonja C. Jähnig Jonathan M. Jeschke Klaus Knopf Stefano Larsen Gabriela Onandia Marlene Pätzig Wolf‐Christian Saul Gabriel Singer Erik Sperfeld Ivan Jarić 《Conservation biology》2017,31(2):481-485
296.
Paula Guedes Nazaré Couto Lisbeth M. Ottosen Alexandra B. Ribeiro 《Waste management (New York, N.Y.)》2014,34(5):886-892
The electrodialytic separation process (ED) was applied to sewage sludge ash (SSA) aiming at phosphorus (P) recovery. As the SSA may have high heavy metals contents, their removal was also assessed. Two SSA were sampled, one immediately after incineration (SA) and the other from an open deposit (SB). Both samples were ED treated as stirred suspensions in sulphuric acid for 3, 7 and 14 days. After 14 days, phosphorus was mainly mobilized towards the anode end (approx. 60% in the SA and 70% in the SB), whereas heavy metals mainly electromigrated towards the cathode end. The anolyte presented a composition of 98% of P, mainly as orthophosphate, and 2% of heavy metals. The highest heavy metal removal was achieved for Cu (ca. 80%) and the lowest for Pb and Fe (between 4% and 6%). The ED showed to be a viable method for phosphorus recovery from SSA, as it promotes the separation of P from the heavy metals. 相似文献
297.
298.
Dalcin MG Pirete MM Lemos DA Ribeiro EJ Cardoso VL de Resende MM 《Journal of environmental management》2011,92(4):1165-1173
Hexavalent chromium is frequently found in industrial effluents as a result of the industrial applications of this compound and its anti-corrosive features. However, hexavalent chromium is extremely toxic, and its discharge in water is regulated, with a maximum limit of 0.1 mg/L in accordance with legislation established by CONAMA-Brazil (no. 397, April 3, 2008). To achieve lower discharge values, it is necessary to reduce from Cr(VI) to Cr(III), which is less toxic, and an economic alternative involves biological removal of this compound. Residence time distributions (RTDs) were measured to evaluate the behavior of actual biofilter operation conditions in a biofilter flow. The medium residence time distributions used were 8 and 24 h (recommended by the legislation). To optimize this process, a central composite design was used, considering the initial chromium concentration and pH as the independent variables and the removal of hexavalent chromium as the response. The boundary curves and surface response showed optimal behavior at 3.94 mg/L [Cr(0)] and a pH of 6.2. The removal process of hexavalent chromium is mathematically described by the Michaelis-Menten kinetic model. This model appropriately represents the variation of chromium concentration along the bioreactor. 相似文献
299.
Eiró Luciana Guimarães Ferreira Maria Karolina Martins Frazão Déborah Ribeiro Aragão Walessa Alana Bragança Souza-Rodrigues Renata Duarte Fagundes Nathalia Carolina Fernandes Maia Lucianne Cople Lima Rafael Rodrigues 《Environmental science and pollution research international》2021,28(28):37001-37015
Environmental Science and Pollution Research - Lead (Pb) is one of the most toxic and abundant elements in the earth’s crust, which is pointed out that the intoxication caused by it... 相似文献
300.
Malacarne Ingra Tais De Souza Daniel Vitor Rosario Barbara Dos Anjos Viana Milena De Barros Pereira Camilo Dias Seabra Estadella Debora dos Santos Jean Nunes Ribeiro Daniel Araki 《Environmental science and pollution research international》2021,28(12):14285-14292
Environmental Science and Pollution Research - Crack-cocaine is a cocaine by-product widely consumed by general population in developing countries. The drug is low cost and is associated with more... 相似文献