abstract
The use of cork granules for cleaning up crude oil or oil derivative spills and further oil recovery appears as a promising option due to their unique properties, which allow a high oil sorption capacity, low water pickup and excellent reuse. The present work reports the effect of oil viscosity on cork sorption capacity by using five types of oils (lubricating oil, 5.7 g(oil) g(cork)(-1); heavy oil, 4.2 g(oil) g(cork)(-1); light oil, 3.0 g(oil) g(cork)(-1); biodiesel, 2.6 g(oil) g(cork)(-1); and diesel, 2.0 g(oil) g(cork)(-1)). The cork sorption capacity for light petroleum was also evaluated as a function of temperature and sorbent particle size. Additionally, improvements on oil recovery from cork sorbents by a mechanical compression process have been achieved as a result of a design of experiments (DOE) using the response surface methodology. Such statistical technique provided remarkable results in terms of cork sorbent reusability, as the oil sorption capacity was preserved after 30 cycles of sorption-squeezing steps. The sorbed oils could be removed from the sorbent surface, collected simply by squeezing the cork granules and further reused. The best operational region yielded near 80% oil recovery, using a cork mass of 8.85 g (particle size of 2.0-4.0 mm) loaded with 43.5 mL of lubricating oil, at 5.4 bar, utilising two compressions with a duration of 2 min each.
keywords
SORBENTS; SORPTION; ADSORPTION; RECOVERY; REMOVAL; TEMPERATURE; COMBUSTION; BLENDS; POWDER; RUBBER
subject category
Environmental Sciences & Ecology
authors
Todescato, D; Hackbarth, FV; Carvalho, PJ; de Souza, AAU; de Souza, SMAGU; Boaventura, RAR; Granato, MA; Vilar, VJP
our authors
Pedro J. Carvalho
Assistant ProfessorProjects
CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Projeto de Investigação Exploratória: Pedro Carvalho (IF/00758/2015)
acknowledgements
This work was financially supported by Associate Laboratory LSRE-LCM-UID/EQU/50020/2019-funded by national funds through FCT/MCTES (PIDDAC). Vitor J.P. Vilar acknowledges the FCT Individual Call to Scientific Employment Stimulus 2017 (CEECIND/01317/2017) and the Special Visiting Researcher Program PVE (CAPES Project No. A069/2013). F.V Hackbarth acknowledges her postdoctoral fellowship provided by CAPES PNPD, and the postgraduate programme in chemical engineering of the Federal University of Santa Catarina. D. Todescato acknowledges his Doctoral fellowship provided by CNPq, CAPES (BEX 99999.007222/2015-07) and ANP-PRH09. This work was developed in the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER-007679 (ref. FCT UID/CTM/50011/2013), funded by FEDER through COMPETE2020-Programa Operacional Competitividade e Internacionalizacao (POCI) and by national funds through FCT-Fundacao para a Ciencia e a Tecnologia. P. J. Carvalho acknowledges FCT for a contract under the Investigador FCT 2015, Contract IF/00758/2015.