Encontrados 19 documentos, a visualizar página 1 de 2
Bioremoval of diethylketone by the synergistic combination of microorganisms an...
Quintelas, C.; Costa, Filomena; Tavares, T.The performance of two bacteria, Arthrobacter viscosus and Streptococcus equisimilis, and the effect of the interaction of these bacteria with four different clays on the retention of diethylketone were investigated in batch experiments. The uptake, the removal percentages and the kinetics of the processes were determined. S. equisimilis,by itself, had the best performance in terms of removal percentage, for al...
Effect of phosphorus on the attenuation of lead and chromium
Devesa-Rey, R.; Fonseca, B.; Rubinos, D.; Tavares, T.This study analyses the adsorption of Pb(II) and Cr(III) in soils. These metals are commonly found together in nature in urban wastes or industrial spillages, and the theoretical approach of the work was to evaluate the response of the soil to continuous Cr and Pb spillages to soil in terms of several physicochemical parameters. The influence of an anthropogenic input of phosphorus was evaluated. Continuous flo...
Development of permeable biobarrier for the removal of PAH’s by Trichoderma lon...
Cobas, M.; Ferreira, L.; Tavares, 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...
Assessment of Arthrobacter viscosus as reactive medium for forming permeable re...
Ferreira, L.; Cobas, M.; Tavares, 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...
Bioremediation of Cr(VI) polluted wastewaters by sorption on heat inactivated S...
Hlihor, R. M.; Diaconu, M.; Fertu, D.; Chelaru, C.; Sandu, I.; Gavrilescu, M.; Tavares, T.The potential of heat inactivated Saccharomyces cerevisiae in the bioremoval and reduction of Cr (VI) ions from wastewaters was evaluated in terms of metal uptake in time and at equilibrium, and biosorption efficiency, by varying pH, biosorbent doses, contact time and temperature, in batch mode. During the sorption process, the heat inactivated biomass of the yeast Saccharomyces cerevisiae is capable of reducin...
Evaluation of ion exchange-modified Y and ZSM5 zeolites in Cr(VI) biosorption a...
Silva, Bruna; Figueiredo, Hugo; Soares, O. S. G. P.; Pereira, M. F. R.; Figueiredo, J. L.; Lewandowska, A. E.; Bañares, M. A.; Bañares, M. A.The aim of this work was the evaluation of the performance of two zeolites with different structures (FAU and MFI) and acidity properties in the biosorption of Cr(VI) and catalytic oxidation of ethyl acetate. The starting zeolites, Y (FAU) and ZSM5 (MFI), were modified by ion exchange treatments with NaNO3 in order to obtain zeolites with different acidity and sodium content. A biosorption system consisting of ...
Improved biosorption for Cr(VI) reduction and removal by Arthrobacter viscosus ...
Silva, Bruna; Figueiredo, Hugo; Quintelas, C.; Neves, Isabel C.; Tavares, T.The aim of the present work was to optimize the reduction and removal of chromium from aqueous solutions by a biosorption system consisting of a bacteria supported on a zeolite. The system proposed combines the biosorption properties of Arthrobacter viscosus, with the ion exchange capacity of NaY zeolite. Experiments were also performed without the zeolite for comparison purposes. Experimental parameters such a...
Removal of hexavalent chromium of contaminated soil by coupling electrokinetic ...
Fonseca, Bruna; Pazos, M.; Tavares, 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 ...
The effect of replacing inorganic trace minerals with selenium yeast and organi...
Tavares, T; Mourão, J.L; Kay, Z; Spring, P; Vieira, J; Gomes, A; Vieira-Pinto, MThe aim of the study was to compare the performance profiles of broilers fed with a commercial inorganic mineral premix (control) with the ones obtained using an organic treatment (OTM). OTM included; selenium yeast and organic mineral chelates of copper (Cu), zinc (Zn), manganese (Mn) and iron (Fe). Four identical houses with a total of 119.500 mixed-sex broiler chickens were used (2 treatments × 2 replicates)...
Optimisation, by response surface methodology, of degree of hydrolysis and anti...
Tavares, T. G.; Contreras, M. M.; Amorim, M.; Martín-Álvarez, P. J.; Pintado, M. E.; Recio, I.; Malcata, F. X.The hydrolysis of bovine whey protein concentrate (WPC), a-lactalbumin (a-La) and caseinomacropeptide (CMP), by aqueous extracts of Cynara cardunculus, was optimized using response surface methodology. Degree of hydrolysis (DH), angiotensin-converting enzyme (ACE)-inhibitory activity and antioxidant activity were used as objective functions, and hydrolysis time and enzyme/substrate ratio as manipulated paramete...
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