Browsing by Author "Correia, P."
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- Studies on sorption and regeneration of granulated cork for oil and grease removalPublication . Pereira, J.; Ferreira, Catarina Isabel de Almeida; Pintor, Ariana; Correia, P.; Silva, Susana; Vilar, Vítor J.P.; Botelho, Cidália; Martins, Ramiro; Órfão, J.; Boaventura, RuiThe aim of this work is to develop a method to recover sorbed oil and grease from granulated cork, in order to promote biomass regeneration. Experimental procedure involved biomass saturation with oil, followed by chemical regeneration. Oil removal by elution was tested using HNO3 and NaOH solutions, cationic and anionic surfactants and organic solvents, namely carbon tetrachloride and n-hexane. Chemical desorption efficiency using organic solvents achieved values of 90 ± 6 % and 72 ± 6 % for CCl4 and n-hexane, respectively. Although the use of organic solvents proved to be an efficient process, it involves high costs and a negative environmental impact. Physical regeneration could be an alternative to the use of solvents for oil removal from granulated cork.
- Treatment of wastewater containing mineral oil by sorption onto granulated corkPublication . Ferreira, Catarina Isabel de Almeida; Pereira, J.; Pintor, Ariana; Correia, P.; Silva, J.; Vilar, Vítor J.P.; Botelho, Cidália; Martins, Ramiro; Orfão, J.; Boaventura, RuiThe aim of this work is the development of a new method to remove oils from wastewaters, namely hydrocarbons. These contaminants, when present in high concentrations, are efficiently removed by physical and chemical processes, such as gravity separators, flocculation and flotation processes; however for low concentrations, these methods are not applicable [1]. Moreover, advanced separation processes such as membrane separation [2] and activated carbon adsorption [3] are expensive options for the treatment of oil-containing wastewaters. This new technique is based on oil and hydrocarbons’ sorption on cork granules.
- Utilização de resíduos ou subprodutos de cortiça para a eliminação de óleos e gorduras de águas.Publication . Vilar, Vítor J.P.; Ferreira, Catarina Isabel de Almeida; Pereira, J.; Pintor, Ariana; Botelho, Cidália; Martins, Ramiro; Órfão, J.; Boaventura, Rui; Correia, P.; Silva, S.Este trabalho pretende apresentar a cortiça como um material competitivo para a resolução de problemas ambientais, nomeadamente a eliminação de gorduras hidro-solúveis ou dispersas em águas. Os métodos convencionais de tratamento, que incluem processos físicos/químicos, são muito eficientes na remoção de óleos e gorduras em concentrações elevadas, mas são ineficazes quando estes poluentes estão presentes em baixas concentrações, sendo necessário utilizar tecnologias dispendiosas de separação por membranas ou adsorção em carvão ativado. Nesse sentido, pretende-se encontrar um material de cortiça adequado, tendo em conta uma ampla diversidade de fontes e granulometrias, para esta aplicação, com o intuito de obter um efluente final com a qualidade exigível para a reutilização da água, reduzindo os custos associados ao consumo de água e taxas de descarga do efluente no emissário ou no meio hídrico natural, sem falar do benefício ambiental decorrente da redução de consumo de água pelas indústrias que utilizem esta tecnologia.
- Valorisation of cork by-products for the treatment of vegetal and animal oil containing wastewatersPublication . Pereira, J.P.; Ferreira, Catarina Isabel de Almeida; Pintor, Ariana; Correia, P.; Silva, Susana; Vilar, Vítor J.P.; Botelho, Cidália; Martins, Ramiro; Orfão, J.; Boaventura, RuiIn this study, cork granules, which are by-products of the cork processing industry, were used as biosorbents for the removal of vegetable and animal oils from water. Simple oil-in-water emulsions were created by ultrasonic emulsification and batch adsorption tests were performed by contacting cork with these emulsions for a defined period of time. A mass transfer model was able to predict adequately the kinetic data, using a Linear Driving Force approximation for intraparticle diffusion and equilibrium described by the Langmuir-Freundlich equation. Maximum sorption capacities for vegetable and animal oil, as calculated by the Langmuir-Freundlich model, were 5 ± 4 and 2.3 ± 0.9 g g-1, respectively. Therefore, expanded cork granules proved to be an efficient, low-cost sorbent for both vegetable and animal oils