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Artigo em Inglês | MEDLINE | ID: mdl-31916177


The green roofs are structures characterized by the application of vegetation cover in the buildings, using adequate waterproofing and drainage systems. It allows the reduction of surface runoff and delay in peak flow, contributing to the mitigation of flood events in urban areas. Therefore, this study aimed to evaluate the effect of the use of vegetal coverings on the surface runoff, taking into account quantitative and qualitative aspects, using an experimental module installed in the city of Porto Alegre, Brazil. The experimental station consisted of four modules: two horizontal modules with and without vegetation cover and two modules with slopes of 15° with and without vegetation cover. It was evaluated 19 precipitation events, and it was verified the volumes drained in each module after 3, 6 and 12 h from the beginning of precipitation. The water samples were collected in order to analyse the quality of the runoff from the experimental modules. The results have shown that the use of vegetal coverings can provide better distribution of the surface runoff, as well as a decrease of the speed of excess water release with no surface runoff in the first 3 h after the onset of rainfall in the horizontal module. Additionally, it was proved the reduction in drained volumes, with the flat module with vegetation cover being capable of retaining completely precipitations with volumes of approximately 22 mm. The vegetation cover module in roofs was the one that has presented better results regarding the reduction of the flow, presenting an average retention percentage of 91.7% for the first 3 h, indicating that the slope is an important factor. The physical-chemical analysis of the water shows that for all analysed modules, it is possible to use water for non-potable uses, although the water quality of the modules with vegetation cover is lower when compared to the water coming from the module without vegetation cover.

J Environ Manage ; 256: 109953, 2020 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-31989980


The study evaluated plants with phytoremediation potential that occur spontaneously in an area of copper mining tailings in Southern of Brazil. Eleven plant species were investigated for heavy metal concentrations in its biomass. All species showed copper concentrations greater than 100 mg kg-1, and seven species highlighted for copper concentrations between 321 and 586 mg kg-1 and these species showed Cr concentrations between 25 and 440 mg kg-1. The species S. viarum Dunal and B. trimera Less were highlighted showing the highest concentrations of Cr (586 mg kg-1) and Cu (440 mg kg-1), respectively. Seven species showed Pb phytoextraction potential and four species showed Cu phytostabilization potential. It was concluded that the investigated species are adapted to low nutritional conditions and showed tolerance to heavy metals, mainly Cu, Pb and Cr in its biomass.

Metais Pesados , Poluentes do Solo , Biodegradação Ambiental , Brasil , Cobre , Mineração , Raízes de Plantas
Environ Sci Pollut Res Int ; 26(23): 24132-24142, 2019 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-31228062


Mining tailing areas may contain metal minerals such as Cu, Pb, Zn, Cr, and Cd at high concentrations and low nutrients for the growth of plants. This kind of conditions of the area, as well as lack of tailing structure, may limit the development of plants on these areas. Thus, the present study determined the metal, macronutrient, and micronutrient concentrations in the tissues of the roots and shoots of the Solanum viarum Dunal species as well as it evaluated the potential use of the plant for phytoremediation of mining tailing areas contaminated with heavy metals. The macronutrients, micronutrients, and heavy metals in the roots and shoots were determined by the digestion method with nitric and perchloric acid (HNO3-HClO4) and quantified by the ICP-OES. In S. viarum, the average concentrations of the metals presented in the dry biomass varied between the shoots and roots, being higher in the roots for metals such as Cu (229 mg kg-1), Zn (232 mg kg-1), Mn (251 mg kg-1), Cr (382 mg kg-1), Ni (178 mg kg-1), Pb (33 mg kg-1), and Ba (1123 mg kg-1). S. viarum indicates the possibility of a potential application in phytoremediation and treatment of areas contaminated with heavy metals.

Recuperação e Remediação Ambiental/métodos , Metais Pesados/análise , Mineração , Poluentes do Solo/análise , Solanum/química , Biodegradação Ambiental , Biomassa , Brasil , Metais Pesados/farmacocinética , Raízes de Plantas/química , Raízes de Plantas/efeitos dos fármacos , Raízes de Plantas/metabolismo , Brotos de Planta/química , Brotos de Planta/efeitos dos fármacos , Brotos de Planta/metabolismo , Poluentes do Solo/farmacocinética , Solanum/efeitos dos fármacos , Solanum/metabolismo , Distribuição Tecidual
Int J Phytoremediation ; 21(11): 1145-1152, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31088309


The evaluation of plants occurring naturally at contaminated environments are essential for applying this species in remediation techniques. In this context, the Sagittaria montevidensis with potential for phytoremediation was studied at an anthropogenic polluted stream in southern Brazil. The nutrients and heavy metal content were determined in the phytomass. The phytoremediation indexes were evaluated such as bioconcentration factor (BCF), translocation factor (TF), plant effective number (PEN), and potential phytoremoval (mg m-2). The S. montevidensis was then detected as presenting natural phytoextraction ability for potassium and calcium elements and also demonstrated rhizofiltration potential for phosphorus, manganese, aluminum, vanadium, sulfur, iron, arsenic, copper, magnesium, zinc, sodium, lead, cadmium, nickel, chromium, considering its ability of bioaccumulating these contaminants and retain high levels in the roots. The highest potential for bioremoval (mg m-2) of the S. montevidensis was detected for potassium and calcium (recommending thus the use for phytoextraction) and for aluminum, phosphorus, iron, magnesium, sulfur, and sodium, along with heavy metals (recommended for rhizofiltration). The S. montevidensis decontamination ability, along with its biomass production and its adaptability represents a great advance in order to the recovery of this degraded area and possible application in other contaminated watercourses in Brazil.

Metais Pesados , Sagittaria , Poluentes do Solo , Biodegradação Ambiental , Brasil , Nutrientes