Made available in DSpace on 2014-12-17T15:42:01Z (GMT). No. of bitstreams: 1 CamilaGRA_DISSERT.pdf: 2325529 bytes, checksum: 83d27b47b244a6da7127c42df79472b8 (MD5) Previous issue date: 2012-05-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The groundwater pollution arising due to fuel leaks gas stations has presented a problem aggravating. Increasingly studies related to environmental problems such accidents and seek to propose some solutions for the treatment of groundwater and soils that are contaminated by gasoline. This study evaluated the use of molecular sieve TiSBA-15 as a catalyst for the reaction of removing of volatile organic compounds, particularly benzene, toluene, ethylbenzene and xylenes, known as BTEX, one of the main pollutants found in groundwater. The catalyst was synthesized by the method post-synthesis techniques and characterized by XSD, TG/DTG, adsorption/desorption of N2, XRF-EDX, for checking the incorporation of titanium and formation of the structure of the catalyst. The reaction occurred with the presence of hydrogen peroxide, H2O2, in aqueous medium to form hydroxyl radicals, which are needed in the process of removal of BTEX compounds. The catalytic reaction was carried out for 5 hours at 60 ?C, pH to 3.0, and analyzes of the compounds were made in a gas chromatograph with a flame detection means photoionization static headspace (HS-GC-PID). The catalytic tests have shown the efficacy of using this type of catalyst for the removal of these volatile organic compounds, having a removal rate of 90.60% in the range where the catalyst was studied TiSBA-15(5,0) / A polui??o das ?guas subterr?neas devido a decorrentes vazamentos de combust?vel por postos de gasolina tem se apresentado um problema agravante. Cada vez mais estudos relacionam problemas ambientais com tais acidentes e procuram propor algumas solu??es para o tratamento das ?guas subterr?neas e solos que s?o contaminados pela gasolina. Este trabalho avalia o uso da peneira molecular TiSBA-15 como catalisador da rea??o de remo??o de compostos org?nicos vol?teis, especificamente benzeno, tolueno, etilbenzeno e xilenos, conhecidos como BTEX, um dos principais poluentes encontrados em ?guas subterr?neas. O catalisador foi sintetizado pelo m?todo p?s-s?ntese e caracterizado pelas t?cnicas de DRX, TG/DTG, adsor??o/dessor??o de N2, e FRX-EDX. O estudo da atividade catal?tica da TiSBA- 15 ocorreu com a presen?a de per?xido de hidrog?nio, H2O2, em meio aquoso, para a forma??o de radicais hidroxilas, os quais ser?o necess?rios no processo de remo??o dos compostos BTEX. A rea??o catal?tica foi realizada durante 5h a 60 ?C, pH igual a 5,0, e as an?lises dos compostos foram feitas em um cromat?grafo a g?s com detec??o por fotoioniza??o de chama via headspace est?tico (HS-GC-PID). Os testes catal?ticos mostraram a efic?cia no uso deste tipo de catalisador para a remo??o desses compostos org?nicos vol?teis, apresentando uma taxa de remo??o na faixa de 90,60%, onde o catalisador em estudo foi o TiSBA-15(5,0)

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-12-29T18:20:30Z No. of bitstreams: 1 AnaCleaMarinhoMirandaCatunda_TESE.pdf: 3985598 bytes, checksum: ced41c3c7c54212ab1644a8679629771 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-01-02T20:58:54Z (GMT) No. of bitstreams: 1 AnaCleaMarinhoMirandaCatunda_TESE.pdf: 3985598 bytes, checksum: ced41c3c7c54212ab1644a8679629771 (MD5) / Made available in DSpace on 2017-01-02T20:58:54Z (GMT). No. of bitstreams: 1 AnaCleaMarinhoMirandaCatunda_TESE.pdf: 3985598 bytes, checksum: ced41c3c7c54212ab1644a8679629771 (MD5) Previous issue date: 2016-04-11 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Os poluentes presentes na atmosfera, est?o principalmente relacionados ? grande emiss?o proveniente dos ve?culos automotivos e postos revendedores de combust?veis. O presente trabalho teve o objetivo de desenvolver um modelo de amostrador passivo e um biosorvente para Compostos Org?nicos Vol?teis - COVs espec?ficos para aplica??o em estudos de monitoramento ambiental da qualidade do ar. Neste trabalho foi avaliado o emprego de amostradores passivos para monitoramento ambiental de COVs e em especial o benzeno, devido seu alto grau de toxidade. A Ag?ncia Internacional de Pesquisa em C?ncer (International Agency for Research on Cancer - IARC/OMS) classifica o benzeno no Grupo 1, ou seja, como uma subst?ncia qu?mica com evid?ncias suficientes de sua carcinogenicidade em seres humanos. Os estudos de sor??o dos COVs, na fibra da Ceiba pentandra ativada constituinte dos amostradores passivos, foram realizados no Laborat?rio de Tecnologia Ambiental - LabTam da UFRN e em um posto revendedor de combust?veis na cidade de Natal?RN. As amostras foram analisadas utilizando um dessorvedor t?rmico acoplado a um cromat?grafo gasoso com detector de massa (CGMS). O m?todo de amostragem que utiliza amostradores passivos difusivos e a an?lise de COVs atrav?s do m?todo da pir?lise (CGMS) proposto neste trabalho, foi uma adapta??o do m?todo TO-17, da Ag?ncia de Prote??o Ambiental dos Estados Unidos - United States Enviromental Protection Agency. Este m?todo proposto permitiu identificar a presen?a dos compostos COVs no ar ambiente. A partir dos resultados obtidos em laborat?rio e em campo, correla??es emp?ricas foram propostas para correlacionar as concentra??es dos poluentes com as ?reas dos picos obtidos no CGMS. Esta correla??o proposta pode ser utilizada para obter bons resultados em diferentes locais e esta??es do ano. O biosorvente fibra da Ceiba pentandra ativada, confirmou atrav?s dos resultados da ?rea espec?fica (BET), temperatura de degrada??o (TG/DTG) e a hidrofobicidade do material, suas qualidades na amostragem de COVs do ar, que al?m de proteger o sistema analito de eventuais quantidades de ?gua, apresentou baixos n?veis de ru?do na faixa de elui??o estudada no CGMS. O m?todo de amostragem que utiliza amostradores passivos difusivos, permitiu identificar a presen?a de benzeno nos experimentos simulados no laborat?rio, como tamb?m, no ar ambiente. Diante dos resultados observados desta pesquisa, tecnologias ambientais inovadoras devem ser implementadas para contribuir com a redu??o dos riscos ocupacionais ocasionados pelos COVs, nas opera??es de abastecimento nos postos revendedores de combust?veis (PRCs) com o objetivo de proteger a sa?de dos trabalhadores frentistas. ? importante salientar que os resultados observados ao longo desta pesquisa devem ser encarados como indicativos e n?o conclusivos, pois um monitoramento maior se faz necess?rio para que conclus?es definitivas possam ser elaboradas. / Pollutants in the atmosphere are mainly related to large emission from the vehicles automotive and fuel service stations. This study aimed to develop a model of passive sampler and biosorbent for Volatile Organic Compounds - VOCs specific for application in environmental monitoring studies of air quality. This study evaluated the use of passive samplers for environmental monitoring of VOCs and benzene in particular, due to its high toxicity. The International Agency Research on Cancer (IARC/WHO) classifies benzene in the Group 1, that is as a chemical substance with sufficient evidence of its carcinogenicity in humans. Sorption studies of VOC in fiber Ceiba pentandra active constituent of passive samplers were held in the Laborat?rio de Tecnologia Ambiental- Labtam (UFRN) and a fuel service station in the city of Natal-RN. The samples were analyzed using a Thermal Desorption coupled to a gas chromatograph with a mass detector (GC/SM). The sampling method using diffusive passive samplers and VOC analysis through of pyrolysis method (GC/SM) proposed in this work, was an adaptation of the TO-17 method from the Environmental Protection Agency - United States Environmental Protection Agency. This proposed method allowed to identify the presence of VOC compounds in ambient air. From the results obtained in the laboratory and in the field, empirical correlations have been proposed to correlate the concentrations of the pollutants with the peak areas obtained from the GC/MS. This correlation proposal can be used to obtain good results in different locations and seasons. The biosorbent activated fiber Ceiba pentandra, confirmed by the results of the specific area (BET), degradation temperature (TG/DTG) and the hydrophobicity of the material, its qualities on the VOC sampling the air, which in addition to protecting the analyte system of any amounts of water, showed low noise levels in the elution range studied in the GC/SM. The sampling method which utilizes passive diffusive samplers allows identifying the presence of benzene in the simulated experiments in laboratory, but also in ambient air. Based on the results observed in this research, innovative environmental technologies should be implemented to contribute to the reduction of occupational hazards caused by VOC in the supply operations in fuel service stations in order to protect the health of gas station attendants. Importantly, the results observed during this research should be viewed as indicative and not conclusive, because one greater monitoring is needed so that definitive conclusions can be elaborated.

Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2017-07-03T12:22:22Z No. of bitstreams: 1 AnaCarolinaMarcalPiresFerreiraLucas_DISSERT.pdf: 2241069 bytes, checksum: cc1d053944af95b14551bddf9de6e962 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2017-07-05T15:51:20Z (GMT) No. of bitstreams: 1 AnaCarolinaMarcalPiresFerreiraLucas_DISSERT.pdf: 2241069 bytes, checksum: cc1d053944af95b14551bddf9de6e962 (MD5) / Made available in DSpace on 2017-07-05T15:51:20Z (GMT). No. of bitstreams: 1 AnaCarolinaMarcalPiresFerreiraLucas_DISSERT.pdf: 2241069 bytes, checksum: cc1d053944af95b14551bddf9de6e962 (MD5) Previous issue date: 2017-03-31 / As Unidades de Terminais Aquavi?rios tem como fun??o principal receber, armazenar e distribuir petr?leo, derivados e combust?veis renov?veis l?quidos, garantindo o abastecimento dos mercados nacional e internacional. A grande movimenta??o log?stica gerada pela explora??o, beneficiamento, armazenagem, transporte e comercializa??o do petr?leo e seus derivados vem gerando preocupa??es relacionadas ? sua potencialidade de contamina??o do ambiente. Por causa dos in?meros acidentes com derramamento de combust?veis, os quais ocasionam contamina??es de solos e ?guas por hidrocarbonetos derivados de petr?leo, torna as pesquisas neste contexto um desafio para os profissionais que atuam na ?rea, em fun??o da complexidade de intera??es que ocorrem no solo e na ?gua. O Terminal, objeto de estudo, est? localizado na cidade de Natal-RN e ocupa uma ?rea de 110.000 m2. O estudo visa avaliar a contamina??o do solo e ?gua subterr?nea por derivados de petr?leo na bacia do tanque 1430-04, caracterizando a presen?a de subst?ncias com potencial de contamina??o atrav?s de dados obtidos pela coleta de amostras do solo e ?gua distribu?das para an?lise dos par?metros TPH fracionado, BTEX, VOC, SVOC e Metais. Como tamb?m, a an?lise dos par?metros f?sicos do solo (granulometria, porosidade total e efetiva, densidade de part?culas e total do solo, umidade natural) e fra??o de carbono org?nico. As an?lises qu?micas das amostras de solo n?o apresentaram concentra??es dos par?metros analisados (TPH, BTEX, VOC, SVOC e Metais). Nas amostras de ?gua subterr?neas foram detectadas concentra??es de benzeno, al?m de xilenos e TPH. Para os metais, foram detectados concentra??es de chumbo, al?m do ferro. J? para os metais dissolvidos apenas o chumbo apresentou concentra??es acima dos valores de investiga??o. Todos os resultados das an?lises qu?micas foram comparados com os valores da Resolu??o 420 do CONAMA de 2009. / The Aquavi?rios Terminal Unit's main function is to receive, store and distribute oil, oil products and liquid renewable fuels, ensuring the supply of domestic and international markets. The great logistic movement generated by the exploration, processing, storage, transportation and commercialization of oil and its derivatives has generated worries related to its potential contamination of the environment. Because of the numerous accidents with fuel spills, which cause contamination of soils and waters by oil-derived hydrocarbons, research in this context makes it a challenge for professionals working in the area, due to the complexity of interactions occurring in the soil and in the water. The Terminal, object of study, is located in the city of Natal-RN and occupies an area of 110,000 m2. The aim of this study is to evaluate soil and groundwater contamination by petroleum by-products in the 1430-04 basin, characterizing the presence of substances with potential contamination in soil and groundwater through the collection of soil and water samples for the analysis of TPH fractional parameters, BTEX, VOC, SVOC and metals. As well as the analysis of soil physical parameters (particle size, total and effective porosity, particle density and total soil, natural moisture) and organic carbon fraction. The chemical analyzes of soil samples did not present concentrations of the analyzed parameters (TPH, BTEX, VOC, SVOC and metals). Concentrations of benzene were detected in the groundwater samples, in addition to xylenes and TPH. For metals, concentrations of lead were detected in addition to iron. For dissolved metals, only lead had concentrations above the values investigated. All results of the chemical analyzes were compared with the values of CONAMA Resolution 420/2009.

Made available in DSpace on 2014-12-17T14:08:48Z (GMT). No. of bitstreams: 1 HerculesLAS_DISSERT.pdf: 3304337 bytes, checksum: 041717a4cfd116130802eab3678923c7 (MD5) Previous issue date: 2011-01-31 / Among the potentially polluting economic activities that compromise the quality of groundwater are the gas stations. The city of Natal has about 120 gas stations, of which only has an environmental license for operation. Discontinuities in the offices were notified by the Public Ministry of Rio Grande do Norte to carry out the environmental adaptations, among which is the investigation of environmental liabilities. The preliminary and confirmatory stages of this investigation consisted in the evaluation of soil gas surveys with two confirmatory chemical analysis of BTEX, PAH and TPH. To get a good evaluation and interpretation of results obtained in the field, it became necessary three-dimensional representation of them. We used a CAD software to graph the equipment installed in a retail service station fuel in Natal, as well as the plumes of contamination by volatile organic compounds. The tool was concluded that contamination is not located in the current system of underground storage of fuel development, but reflects the historical past in which tanks were removed not tight gasoline and diesel / Dentre as atividades econ?micas potencialmente poluidoras que comprometem a qualidade das ?guas subterr?neas est?o os Postos Revendedores de Combust?veis. A cidade do Natal possui cerca de 120 postos de combust?veis, dos quais, apenas um possui licen?a ambiental de opera??o. Os postos em desconformidade foram notificados pelo Minist?rio P?blico do Rio Grande do Norte para realizarem as adequa??es ambientais, dentre as quais est? a investiga??o de passivo ambiental. As fases preliminar e confirmat?ria desta investiga??o consistiram na avalia??o de gases do solo com duas sondagens confirmat?rias para an?lises qu?micas de BTEX, HPA e TPH. Para obter-se uma boa avalia??o e interpreta??o dos resultados obtidos no campo, se fez necess?rio a representa??o tridimensional dos mesmos. Utilizou-se um software CAD para representar graficamente os equipamentos instalados em um posto revendedor de combust?vel em Natal/RN, assim como as plumas de contamina??o por compostos org?nicos vol?teis. A partir desta ferramenta foi poss?vel concluir que a contamina??o n?o est? localizada no atual Sistema de Armazenamento Subterr?neo de Combust?vel do empreendimento, mas reflete o hist?rico passado em que foram removidos tanques n?o estanques de gasolina e diesel