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The research and development program in reproces sing of low burn-up spent fuel elements began in Brazil in 70’s, originating the lab -scale hot cell, known as CELESTE located at Nuclear and Energy Research Institute, IPEN CNEN/SP. The program was ended at the beginning of 90’s, and the laboratory was c losed down. Part of the radioactive waste generated mainly from the analytical laboratories is stored waiting for treatment at the Waste Management Laboratory, and it is constituted by mixture of aqueous and organic phases. The most widely used technique for the treatment of radioactive liquid wastes is the solidification in cement matrix, due to the low processing costs and compatibility with a wide variety of wastes. However, organics are generally incompatible with cement, interfering with the hydration and setting processes, and requiring pre -treatment with special additives to stabilize or destroy them. The objective of this work can be divided in three parts: i) organic compounds characterization in the radioactive liquid waste; ii) the occurrence of b acterial consortia from Pocos de Caldas uranium mine soil and Sao Sebastiao estuary sediments that are able to degrade organic compounds and third, the development of a methodology to biodegrade organic compounds from the radioactive liquid waste aiming th e cementation From the characterization analysis, TBP and ethyl acetate were chosen to be degrade d. The results showed that selected bacterial consortia were efficient for the organic liquid wastes degradation. At the end of the experiments the biodegradat ion level were 66% for ethyl acetate and 70% for the TBP. SUMARIO Pagina 1. INTRODUCAO ....1 2 . OBJETIVO 3 3. REVISAO BIBLIOGRAFICA 4 3.1. Gerencia de rejeitos radioativos 4 3.2. Principais compostos orgânicos util izados no processo PUREX 9 3.2.1. Tri-butilfosfato 9 3.2.2. Alcanos 10 3.3.3. Acetato de etila 12 4. METODOLOGIA 13 4.1. Caracterizacao dos rejeitos 15 4.2. Obtencao e estudo das comunidades mi crobianas 17 4.2.1. Avaliacao dos RRLO quanto a presenca de microrganismos 17 4.2.2. Ensaios de biodegradacao dos principais compostos orgânicos presentes nos RRLO. 18 4.2.2.1. Origem das comunidades microbianas 18 4.2.2.2. Obtencao das comunidades microbianas 20 4.3. Biodegradacao dos RRLO 23 4.4. Gerenciamento de rejeitos 26 5 . RESULTADOS E DISCUSSAO 27 5.1. Caracterizacao dos Rejeitos 27 5.2. Obtencao e estudo das comunidades microbianas 29 5.2.1. Avaliacao da contaminacao por microrganismos. 29 5.2.2. Determinacao da concentracao inibitoria minima (CIM) dos Rejeitos Radioativos Liquidos Orgânicos (RRLO). 29 5.2.3. Curvas de crescimento 29 5.2.4. Experimentos de biodegrad acao dos compostos orgânicos presentes nos RRLO. 36 5.2.4.1. Biodegradacao do acetato de etila 36 5.2.4.2. Biodegradacao do dodecano ...38 5.2.4.3. Biodegradacao do TBP 39 5.3. Biodegradacao dos RRLO 43 5.3.1. Concentracao inibitoria minima (CIM) dos RRLO destilados 43 5.3.2. Ensaios de biodegradacao dos RRLO 80 e 85 in natura e destilados. 43 5.4. Consideracoes finais 50 6 . CONCLUSOES 52 7. TRABALHOS FUTUROS 53 REFERENCIAS 54

Biodegradação de rejeitos radioativos líquidos orgânicos provenientes do reprocessamento do combustível nuclear