Time filter

Source Type

Sarubbo L.A.,Catholic University of Pernambuco | Sarubbo L.A.,Center for Management of Technology and Innovation | Rocha R.B.,Center for Management of Technology and Innovation | Rocha R.B.,Federal University of Pernambuco | And 7 more authors.
Chemistry and Ecology | Year: 2015

Contamination by heavy metals is the result of different industrial activities. The presence of heavy metals in soil and water causes serious problems, as these materials are not biodegradable and do contaminate both biological systems and the subsoil. Biological surface-active compounds otherwise known as biosurfactants in general and rhamnolipids biosurfactants in particular have been successfully employed in the remediation of environments contaminated with heavy metal ions. The aim of the present review is to highlight potential applications of these tensioactive compounds for use in environmental heavy metals removal and bioremediation and processes involved. © 2015 Taylor & Francis. Source

da Rocha e Silva F.C.P.,Federal Rural University of Pernambuco | da Rocha e Silva F.C.P.,Catholic University of Pernambuco | da Rocha e Silva F.C.P.,Center for Management of Technology and Innovation | da Rocha e Silva N.M.P.,Catholic University of Pernambuco | And 13 more authors.
Separation Science and Technology (Philadelphia) | Year: 2015

Effluent production of oily water type has generated many environmental problems for several industries. The use of flotation as a separation process of oily waters has been described, although it has been sometimes criticized due to the toxicity of collectors. The development and use of biodegradable surfactants may enhance the further acceptance of this separation technology. This work investigated the removal of the emulsified oil products in water by dissolved air flotation (DAF) with and without the use of a biosurfactant, in pilot scale. The biosurfactant added considerable value to the process, increasing from 80.0% to 98.0% the separation efficiency. © , Copyright © Taylor & Francis Group, LLC. Source

de Souza Vasconcelos R.,Catholic University of Pernambuco | de Souza Vasconcelos R.,Center for Management of Technology and Innovation | de Moura A.E.,Federal University of Pernambuco | de Moura A.E.,Center for Management of Technology and Innovation | And 4 more authors.
Chemical Engineering and Technology | Year: 2015

Beginning with a laboratory-scale physical model, a scale-up correlation for a pilot unit project was determined based on the analysis of dynamic similarity correlations involving the predominant phenomena of a dissolved air flotation (DAF) chamber. The implantation costs of pilot units require special strategies due to the lack of correlations of this type, as novel flotation methods have been considered strictly from an economic standpoint. With the aid of computational fluid dynamics and videos of microbubble and floc flow, inertia and gravity were identified as the predominant phenomena in a DAF chamber. The strategy described herein is simple and reduces the likelihood of future risks in scale-up investments. A simple strategy is described to reduce future risks in scale-up investments by using similarity correlations based on the most important gravitational and inertial forces in a dissolved air flotation (DAF) chamber in a lab-scale model. This scale-up strategy allows for designing a pilot DAF based on the laboratory model, requiring relatively inexpensive material. © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

Silva R.C.F.S.,Federal Rural University of Pernambuco | Silva R.C.F.S.,Center for Management of Technology and Innovation | Almeida D.G.,Federal Rural University of Pernambuco | Almeida D.G.,Center for Management of Technology and Innovation | And 8 more authors.
International Journal of Molecular Sciences | Year: 2014

Petroleum hydrocarbons are important energy resources. However, petroleum is also a major pollutant of the environment. Contamination by oil and oil products has caused serious harm, and increasing attention has been paid to the development and implementation of innovative technologies for the removal of these contaminants. Biosurfactants have been extensively used in the remediation of water and soil, as well as in the main stages of the oil production chain, such as extraction, transportation, and storage. This diversity of applications is mainly due to advantages such as biodegradability, low toxicity and better functionality under extreme conditions in comparison to synthetic counterparts. Moreover, biosurfactants can be obtained with the use of agro-industrial waste as substrate, which helps reduce overall production costs. The present review describes the potential applications of biosurfactants in the oil industry and the remediation of environmental pollution caused by oil spills. © 2014 by the authors; licensee MDPI, Basel, Switzerland. Source

Discover hidden collaborations