Made available in DSpace on 2014-12-17T15:01:44Z (GMT). No. of bitstreams: 1 AlbinaSM.pdf: 1562113 bytes, checksum: e5551de2cc6c767e4141281b3035f979 (MD5) Previous issue date: 2007-12-07 / In this work, biosorption process was used to remove heavy metals from used automotive lubricating oils by a bus fleet from Natal-RN-Brazil. This oil was characterized to determine the physical-chemistry properties. It was also characterized the used oil with the aim of determining and quantifying the heavy metal concentration. Fe and Cu were the metals existent in large concentration and these metals were choused to be studied in solubilization process. For the biosorption process was used the seaweed Sargassum sp for the study of influencing of the metals presents separately and with other metals. It was also studied the effect of the protonation treatment of alga with the objective to know the best efficiency of heavy metals removal. The study of the solubilization showed that the presence of more than a metal favors the solubilization of the metals presents in the oil and consequently, it favors the biosorption process, what becomes interesting the perspective application in the heavy metals removal in lubricating oils used, because the presence of more than a heavy metal favors the solubility of all metals present. It was observed that the iron and copper metals, which are present in large concentration, the protonated biosorbtent was more effective. In this study we used as biomass the marine alga Sargassum sp to study the influence of agitation velocity, temperature and initial biomass concentration on the removal of iron and copper from used lubricant oils. We performed an experimental design and a kinetic study. The experiments were carried out with samples of used lubricant oil and predetermined amounts of algae, allowing sufficient time for the mixture to obtain equilibrium under controlled conditions. The results showed that, under the conditions studied, the larger the amount of biomass present, the lower the adsorption capacity of the iron and of the copper, likely due to a decrease in interface contact area. The experimental design led us to conclude that a function can be obtained that shows the degree of influence of each one of the system variables / No presente trabalho escolheu-se o ?leo lubrificante automotivo usado de uma frota de ?nibus da cidade de Natal-RN-Brasil. Este ?leo foi caracterizado, indicando que os metais contidos em maior concentra??o s?o Ferro (Fe) e Cobre (Cu). Para o processo de biossor??o utilizou-se a alga marinha feof?cea Sargassum sp para se estudar a influ?ncia da presen?a de metal isoladamente e com outros metais. Estudou-se ainda o efeito do tratamento deprotona??o na alga visando a efici?ncia de remo??o de metais pesados. O estudo da solubiliza??o mostrou-se interessante para a aplica??o na remo??o de metais pesados em ?leos lubrificantes usados, j? que a presen?a de mais de um metal pesado favorece a solubilidade de todos os metais presentes. Observou-se que, para os metais Fe e Cu, que est?o presentes no ?leo em maiores concentra??es, a utiliza??o do biossorvente protonado foi mais eficiente. Para estudar a influ?ncia da velocidade de agita??o, da temperatura, da quantidade de biomassa e da concentra??o inicial de biomassa na remo??o de Fe e Cu presentes em ?leos lubrificantes usados utilizou-se a alga marinha Sargassum sp. protonada. Foi realizado um planejamento experimental e um estudo cin?tico. A partir dos resultados obtidos observou-se que nas condi??es estudadas, ? medida que a quantidade de biomassa aumenta, ? menor a capacidade de adsor??o do Fe e do Cu. Do planejamento experimental p?de-se concluir que ? poss?vel obter uma fun??o que mostre o n?vel de influ?ncia de cada uma das vari?veis do sistema. Sendo que para o Fe a vari?vel mais relevante foi a quantidade de biomassa e para o Cu foi a temperatura