Powdered Activated Carbon
Mostrando 13-24 de 29 artigos, teses e dissertações.
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13. Use of Powdered Activated Carbon to Remove the Herbicides Diuron and Hexazinone from Surface Water / Uso de carvão ativado pulverizado para remoção dos herbicidas diuron e hexazinona de água superficial
The Pardo River, the main source of surface water in the northeastern region of the state of São Paulo, flows through the worlds largest sugar and alcohol production pole, which causes it to become polluted with pesticides such as diuron and hexazinone that are used in the cultivation of sugarcane. In this study, the waters of the Pardo River were monitored
Publicado em: 2008
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14. Avaliação da capacidade adsortiva de carvões ativados para a remoção de diuron e hexazinona. / ASSESSMENT OF ACTIVATED CARBON ADSORPTIVE CAPACITY FOR REMOVAL OF DIURON AND HEXAZINONE
The municipal district of Ribeirão Preto is located in the northeast region of the São Paulo State with a population of approximately 560.000 inhabitants (IBGE, 2005). In its economic base the agroindustry is considered as the main pole producing of sugar cane and alcohol of Brazil. In sugarcane culture they are applied several agricultural defensives amon
Publicado em: 2008
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15. Análise sub-ppm de flúor em água pela técnica PIGE / SUB-PPM analysis of fluorine in water by the Pige technique
This work presents a new method for the analysis of fluorine in water, at the tenth of ppm concentration level, based on the PIGE (Particle-Induced Gamma-ray Emission) technique. It is shown that determination of concentrations of this order of magnitude by PIGE requires the use of a preconcentration method. Some attempts of preconcentration of fluorine by a
Publicado em: 2008
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16. Treatability of petrochemical industries wastewaters - case study. / Tratabilidade de águas residuárias de indústrias petroquímicas - estudo de caso.
O tratamento de águas residuárias industriais, submetido constantemente a cargas de choque, é pouco estudado no Brasil, sendo limitado o grau de conhecimento que se tem no mundo sobre os mecanismos de remoção de disruptores endócrinos nos sistemas de tratamento físico-químicos e biológicos. O presente trabalho traz um estudo de caso, envolvendo uma
Publicado em: 2008
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17. Avaliação da utilização de carvão ativado em pó na remoção de microcistina em água para abastecimento público
A eutrofização acelerada dos mananciais superficiais, devido aos despejos de águas residuárias não tratadas, vem comprometendo a qualidade das águas utilizadas no abastecimento público. Como conseqüência desse processo, inúmeros registros de florações de cianobactérias são relatados em todo o mundo. Esses microrganismos são potenciais produtor
Publicado em: 2008
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18. Estudos de formação e remoção de subprodutos de desinfecção (SPDS) em aguas contendo acidos humicols quando sumetidas a dioxido de cloro / Studies of formation and remotion of disinfection by products (DBP), generated by the oxidation of solutions containing humic substances throught the use of chlorine dioxide
The objective of the present research was to analyze the formation of disinfection by products (DPB), generated by the oxidation of solutions containing humic substances with the addition of bromide ions through the use of chlorine dioxide, isolated or associated with free chlorine in different concentrations and reaction times. The technique of gaseous chro
Publicado em: 2007
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19. Evaluation of the activated charcoals and adsorption conditions used in the treatment of sugarcane bagasse hydrolysate for xylitol production
Xylitol has sweetening, anticariogenic and clinical properties that have attracted the attention of the food and pharmaceutical industries. The conversion of sugars from lignocellulosic biomass into xylitol by D-xylose-fermenting yeast represents an alternative to the chemical process for producing this polyol. A good source of D-xylose is sugarcane bagasse,
Brazilian Journal of Chemical Engineering. Publicado em: 2006-03
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20. Remoção dos pertubadores endócrinos 17b-estradiol e p-nonilfenol por diferentes tipos de carvão ativado em pó(CAP) produzidos no Brasil : avaliação em escala de bancada / Removal of the endocrine disruptors 17b-estradiol and pnonylphenol by different powdered activated carbons (pac) produced in Brazil evaluation in bench scale
In the last decades, a growing scientific concern and public debate have been raised over the potential adverse effects associates to human and animal exposure to endocrine disruptors (EDs). Domestic sewers and treated effluents are the most common source of contamination and, according to the literature, these substances are only partially removed by conven
Publicado em: 2006
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21. Definição de alternativas de pré-tratamento de efluentes não domésticos em sistemas públicos de esgotos, utilizando o teste de avaliação da toxicidade refratária. / Definition of petreatment alternatives to non domestic effluent in public owned treatment works (POTWs), using the refractory toxicity assessment test (RTA).
Typically, the cause of effluent aquatic toxicity is unknown. Due to this and the complex makeup and varying toxicants in individual waste streams, a toxicity reduction program must usually begin at the discharge and proceed upstream to find the source. The key toxicant(s) and the actual toxic mechanism are normally not apparent from traditional characteriza
Publicado em: 2006
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22. Formação e remoção de trihalometanos em aguas de abastecimento utilizando permanganato de potassio e carvão ativado em po / Trihalomethane formation and remotion in drinking water using potassium permanganate and powdered activated carbon
The present research had for objective to analyze the formation of THM through the use of potassium permanganate, isolated or associate with free chlorine, in the process of pre-oxidation, and, in a second stage, to evaluate the removal efficiency of these by-products through the adsorption in powdered activated carbon followed by conventional treatment. The
Publicado em: 2005
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23. AvaliaÃÃo do processo de adsorÃÃo da microcistina-LR por carvÃo ativado
Because of the increase of the number of reports of acute and chronic intoxications, as much in animals as in human beings, for toxins produced by cyanobacteria in the water, there is already a great concern on the part of the companies responsible for the treatment and distribution of drinking water. The application of adsorption process for coal activated
Publicado em: 2005
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24. Trihalomethane formation and remotion in pre-oxidation water treatment processes using chlorine / Formação e remoção de trihalometanos em aguas de abastecimento tratadas, na pre-oxidação, com cloro livre
The present research evaluated, in laboratory scale, the formation of trihalomethanes (THM) produced in oxidation reactions, with free chlorine, of water samples with humic acids, in different concentrations and reaction time. This research also studied the presence of the bromide ion, to evaluate, qualitatively and quantitatively, the different species of T
Publicado em: 2005