13 documents found, page 1 of 2
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...
Heterogeneous electro-Fenton treatment: preparation, characterization and perfo...
Iglesias, O.; Fernández de Dios, M. A.; Tavares, M. T.; Sanromán, M. A.In this work the preparation, characterization and performance of Y-zeolite as catalyst for electro-Fenton treatment of pesticides was carried out. Initially iron supported Y-zeolite (Fe-Y) was prepared and evaluated for the degradation of imidacloprid and chlorpyrifos. Kinetics studies determined that the pesticides removal followed a pseudo-first-order kinetic model. However, the reusability of this catalyst ...
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...
Removal of hexavalent chromium of contaminated soil by coupling electrokinetic ...
Fonseca, Bruna; Pazos, M.; Tavares, M. T.; Sanromán, M. A.PURPOSE: In this study, a novel and ecological alternative have been developed to treat soils contaminated with hexavalent chromium coupling two well-known systems: electrokinetic remediation and permeable reactive biobarriers. The electric field promotes the electromigration of the hexavalent chromium oxyanions towards the anode. The biobarriers were placed before the anode electrode, in order to promote the r...
Desorption kinetics of phenanthrene and lead from historically contaminated soil
Fonseca, Bruna; Pazos, M.; Figueiredo, Hugo; Tavares, M. T.; Sanromán, M. A.Heavy metals and polycyclic aromatic hydrocarbons (PAHs) exist naturally in soils at acceptable concentrations. However, the simultaneous accumulation of PAHs and heavy metals in soils surrounding urban complexes, gas stations, metalliferous mines and major roads is growing. Thus, the purpose of this study is to determine the desorption kinetics of heavy metals and PAHs from contaminated soil samples. The influ...