RESUMO
The removal process of BTEX and phenol was evaluated. The smectite organoclay for single-solute system reached removal was evaluated by adsorption on smectite organoclay adsorbent by kinetic and equilibrium efficiencies between 55 and 90% while was reached between 30 and 90% for multi-solute system at 297 K and pH 9. The Langmuir-Freundlich model was used to fit the experimental data with correlation coefficient between 0.98 and 0.99 providing kinetic and equilibrium parameter values. Phenol and ethylbenzene presented high maximum adsorbed amount, 8.28 and 6.67 mg/g, respectively, compared to the other compounds for single-solute. Toluene and p-xylene presented high values of adsorption constant which indicates a high adsorption affinity of compounds to organoclay surface and high binding energy of adsorption. Phenol presented low kinetic adsorption constant value indicating slow rate of adsorption.
Assuntos
Derivados de Benzeno/química , Silicatos/química , Poluentes Químicos da Água/química , Purificação da Água/métodos , Adsorção , Concentração de Íons de Hidrogênio , CinéticaRESUMO
An evaluation of the efficiency of bacterial biomass augmentation was performed at lab-scale for the pollution treatment of the Derby-Tacaruna canal. The canal is located at the central area of Great Recife, alongside an important urban corridor. The characterization of the canal water in different tidal conditions showed that the actual pollution is organic and inorganic (heavy metals). Degradation experiments of water from the canal and rain-off system polluted by synthetic wastewater were performed, using activated sludge and an industrial bioadditive. Continuous reactors under two different conditions were evaluated: with diffuse aeration and without aeration. The channel reactor was operated under steady state conditions at a flow rate of 2.5 L h(-1) and with an average residence time of 22 h without aeration and 17 h with aeration. The organic matter removal was in the range of 60% for the system inoculated with the bioadditive and 85% with activated sludge. It was concluded that the water of the Derby-Tacaruna canal may be treated by activated sludge without being affected by its salt content, while the bioaugmentation technique was not satisfactory due to inhibition by inorganics.
Assuntos
Purificação da Água/métodos , Biodegradação Ambiental , Biomassa , Brasil , Esgotos , Clima Tropical , Eliminação de Resíduos Líquidos/métodos , Movimentos da Água , Poluentes Químicos da Água/química , Poluentes Químicos da Água/metabolismo , Poluição Química da Água/prevenção & controleRESUMO
Em um estudo retrospectivo, foram analisados 44 pacientes operados pela técnica combinada de Stenstrõm-Mustardé-Furnas para correção de orelhas em abano, durante o período de julho de 2001 a julho de 2002, no Hospital São Lucas, da PUCRS. O seguimento pós-operatório foi de 6 a 12 meses sendo encontrados 3 casos de assimetrias (6,82), 5 de extrusão de pontos (11,36), 3 casos de necrose parcial de pele da antihélix (6,82) e nenhum caso de hematoma ou infecção. 42 pacientes (95,45) encontravam-se satisfeitos com a cirurgia. Os resultados são comparados com dados de literatura, concluindo-se ser um procedimento seguro, de aplicação simples e com bom resultados estéticos e baixo índice de recidiva e complicações, correspondendo aos achados descritos na literatura.
A retrospective study analysed 44 patients undergone to corrective otoplasty with the Stenstrõm-Mustardé-Furnas technique, between July 2001 and July 2002, in the Hospital São Lucas da PUCRS. Follow-up range from 6 to 12 months. Were found 3 cases of assimetry (6,82), 5 cases of suture extrusion (11,36) 3 cases of antihelix skin necroses (6,82) and neither case of hematoma or infection. 42 patients (95,45) were satisfied with the surgery. The results are compared with the literature data, and concluded to be a safety surgery, with good results and low recidive rate.
Assuntos
Humanos , Masculino , Feminino , Orelha , Cirurgia Plástica , Cirurgia Plástica/métodos , Orelha/anormalidades , Orelha/cirurgiaRESUMO
El presente trabajo mide el impacto del agregado de flúor al agua potable en la reducción de caries dental en la población escolar de la localidad de Oberá. Misiones (Argentina) y evaluar la asociación entre los índices ceod y CPOD y variables cualitativas tales como el nivel socioeconómico, la higiene bucal y el acceso al agua potable florurada
RESUMO
El trabajo analiza las condiciones socioeconómicas considerando que estas no provocan una situación diferencial (estadisticamente significativa) en materia de caries cuando son evaluados al paso del estrato de niveles socieconómico más alto a los más bajos, aumentan los porcentajes de niños sin experiencia odontológica, con caries que sangran y lo que es más importante se incrementan el porcentaje de escolares que presentan una higiene dental calificada como mala y de los que no tienen acceso al agua potable. Estos resultados plantean la necesidad de mejorar la cobertura de agua potable de atención odontológica en los sectores de menores ingresos e insistir en la realización de campaña de concientización que enfaticen la importancia de una buena higiene dental como medio que contribuye a prevenir las caries
RESUMO
Examina la asociación entre la presencia de caries dental y el consumo de agua fluorada y evalua la influencia en dicha asociación de los factores nivel socioeconómico, resultado de la experiencia odontológica e higiene bucal. El consumo de agua fluorada constituye un factor de protección OR= 0,57 (IC : 0.36-0.93) que reduce el riesgo de caries
RESUMO
A population of 420 snails Biomphalaria straminea, an intermediate host of Schistosoma mansoni, received gamma-rays obtained from a 60Co source in low-doses (0/2,5/5/7,5/10/15/20 and 25 Gy); half population was kept in colonies (allowing cross fertilization) and the other half was maintained in sexual isolation (allowing self fertilization). Results showed that 15 Gy stimulates the fertility of both groups but the colonies were more sensitive and at this dose its fertility overpasses the control group dose. The possible hormonal role played in the observed phenomena is under investigation.
Assuntos
Biomphalaria/fisiologia , Biomphalaria/efeitos da radiação , Raios gama/efeitos adversos , Animais , Fertilidade/efeitos da radiaçãoRESUMO
The authors present daily experience report of a health staff, based in some aspects of microsociology in which the human being manifests all of its "theatrical behavior". Daily life is revealed in a closer look by the health field professionals. Daily life is the "stage" where the plot of life takes place in all of its complexity, the joy, the dreams, the conflicts and the suffering of each day, of each human being. This report analysis some aspects of the "underground centralization of actions", which determines human existence. It has been observed that the power category represented by the "game" had outstanding relevance in the work social relations of the staff. The "theatrical behavior" was the other element found in the analysis made.