15 documents found, page 1 of 2
Intensification of heterogeneous photocatalysis by applying a kenics® static mi...
Vilar, Vítor J.P.; Diez, A.M.; Moreira, F.; Marinho, B.; Espínola, J.; Martins, Ramiro; Sanromán, M.; Pazos, M.; Boaventura, RuiDespite scientific community’s efforts, overcoming mass and photon transfer limitations remain a main challenge for heterogeneous photocatalysis with immobilized catalysts. Here, a Kenics® static mixer was used for the first time as catalyst support for heterogeneous photocatalysis in tubular reactors. This permitted not only to take advantage of the enhanced mass transfer supplied by the intense mixing, but al...
Lipid and protein changes related to quality loss in frozen sardine (Sardina pi...
Méndez, L.; Pazos, M.; Lavilla, M.; Torres, J.A.; Saraiva, J.A.; Vázquez, M.; Aubourg, S.P.; Fidalgo, LilianaThis research focuses on biochemical changes related to quality loss in frozen (−18 °C for 9 months) sardine (Sardina pilchardus) previously subjected to high-pressure (HP) processing (125–200 MPa). The inhibition (p < 0.05) of lipid hydrolysis development (lower free fatty acid formation and lipase activity), observed in frozen sardine as a result of the previous HP treatment, increased with the pressure level...
Grapefruit peelings as a promising biosorbent for the removal of leather dyes a...
Rosales, E.; Meijide, J.; Tavares, T.; Pazos, M.; Sanromán, M. A.The objective of this study was to find a suitable and versatile agroforestry waste as alternative low-cost biosorbents for the removal of inorganic and organic compounds present in the wastewater of tannery industry [leather dyes and Cr(VI)]. Grapefruit peelings, fern, eucalyptus barks, oak leaves and cane pruning of grapevines were evaluated as biosorbents. Among them, grapefruit peelings showed the best resu...
Enhanced selective metal adsorption on optimised agroforestry waste mixtures
Rosales, E.; Ferreira, Laura; Sanromán, M. A.; Tavares, M. T.; Pazos, M.The aim of this work is to ascertain the potentials of different agroforestry wastes to be used as biosorbents in the removal of a mixture of heavy metals. Fern (FE), rice husk (RI) and oak leaves (OA) presented the best removal percentages for Cu(II) and Ni(II), Mn(II) and Zn(II) and Cr(VI), respectively. The performance of a mixture of these three biosorbents was evaluated, and an improvement of 10% in the ov...
Effect of high-pressure processing of Atlantic mackerel (Scomber scombrus) on b...
Pazos, M.; Méndez, L.; Vázquez, M.; Torres, J.A.; Aubourg, S.P.; Saraiva, J.A.; Fidalgo, LilianaThis research focuses on biochemical changes related to quality losses observed in Atlantic mackerel (Scomber scombrus) muscle stored under commercial frozen storage conditions (9 months, −18 °C) when subjected to highhydrostatic pressure (HHP) treatments (125, 150, 175, and 200 MPa for 0 min) before freezing. After freezing, free fatty acid (FFA) formation (lipid hydrolysis assessment) showed a marked inhibiti...
Removal of Di-(2-ethylhexyl)phthalate (DEHP) from water using a LECA-Pseudomona...
Rosales, E.; Cobas, M.; Tavares, M. T.; Sanromán, M. A.; Pazos, M.The removal and biodegradation of an organic toxic pollutant, di-(2-ethylhexyl) phthalate (DEHP), has been investigated. Initially, a screening of different degrading bacteria has been developed and Pseudomonas putida showed the highest degradation ability. This bacterium was immobilised in an inert support, light expanded clay aggregate (LECA). After the biofilm formation on the LECA, the degradation of DEHP w...
Assessment of Arthrobacter viscosus as reactive medium for forming permeable re...
Ferreira, L.; Cobas, M.; Tavares, M. T.; Sanromán, M. A.; Pazos, M.Polycyclic aromatic hydrocarbons (PAHs) are significant environmental contaminants as they are present naturally as well as anthropogenically in soil, air and water. In spite of their low solubility, PAHs are spread to the environment, and they are present in surface water, industrial effluent or groundwater. Amongst all remediation technologies for treating groundwater contaminated with PAHs, the use of a perm...
Development of permeable biobarrier for the removal of PAH’s by Trichoderma lon...
Cobas, M.; Ferreira, L.; Tavares, M. T.; Sanromán, M. A.; Pazos, M.In this work, the formation of permeable reactive biobarriers (PRBBs) using Trichoderma longibrachiatum over nylon sponge as bioreactive medium for removal of polycyclic aromatic hydrocarbons (PAHs) was studied. Colony formation was pretested without PAH presence by inoculation of fungus into nylon sponge. The fungus formed a large quantity of strongly adhesive biofilm among nylon sponge. Afterwards, the abilit...
Development of permeable reactive biobarrier for the removal of PAHs by Trichod...
Cobas, M.; Ferreira, L.; Tavares, M. T.; Sanromán, M. A.; Pazos, M.In this work, the formation of permeable reactive biobarriers (PRBBs) using Trichoderma longibrachiatum over nylon sponge as bioreactive medium for removal of polycyclic aromatic hydrocarbons (PAHs) was studied. Colony formation was pretested without PAH presence by inoculation of fungus into nylon sponge. The fungus formed a large quantity of strongly adhesive biofilm among nylon sponge. Afterwards, the abilit...
Application of zeolite-Arthrobacter viscosus system for the removal of heavy me...
Rosales, E.; Pazos, M.; Sanromán, M. A.; Tavares, M. T.A hybrid system combining the ion-exchange properties of a NaY zeolite and the characteristics of the bacterium Arthrobacter viscosus was investigated to treat polluted effluents with dye and toxic metals. In this study, the dye and the metal ion employed were a thiazine dye, Azure B, and chromium (VI), respectively. Initially, the removal of dye by the zeolite was tested. The analysis of dye equilibrium isothe...