Desenvolvimento e aplicação de teste de toxicidade aguda utilizando como organismo-teste Daphnia magna

• Ano de defesa: 2009
• Autor(a) principal: Monteiro, Suianne Priscilla Passos Barbosa
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Palavras-chave em Português: Saneamento; Toxicidade; Esgotos; Águas residuais; Toxicologia ambiental
• Link de acesso: http://www.repositorio.ufc.br/handle/riufc/17226

In the Ceará state, as far as we know, toxicity tests were never conducted before, either with sewage or industrial wastewater. Thus the present work aimed to implement the cultivation and application of acute toxicity tests with Daphnia magna as test-organism in the Laboratory of Sanitation (LABOSAN) of the Federal University of Ceará (UFC), according to the Brazilian guideline NBR 12713/2004. Based on the recommendations of this guideline, it was possible to cultivate and conduct sensibility experiments and toxicity tests with D. magna with both sewage and industrial wastewaters. Because the amount of neonates in the beginning of cultivation was not enough, a growth curve was developed for each of the algae used to feed D. magna: Pseudokirchneriella subcaptata (ex- Selenastrum capricornutum), Scenedesmus subspicatus and Spirulina platensis, They were tested with three different diets. In this study the amount of food influenced directly D. magna reproduction. Both P. subcaptata and S. subspicatus (algae suggested in the NBR 12713/2004) showed to be a good food source to D. magna when the concentration was 6,5E+06 cels./mL.Daphnia. It was also verified that S. platensis was not good to feed D. magna compared to the other algae tested and reported in the guideline. The sensibility letter was created and the EC 5024h average achieved was comparable to the values reported in literature, which confirm that the letter could be used and the cultivation organisms were in the security interval of the test period. The toxicity test results using real dye-containing wastewater showed that the anaerobic system decrease color and COD and helped to detoxify the effluent. The aerobic post-treatment increased the toxicity. Finally, the ecotoxicity tests with textile wastewater showed to be an important tool to assess sub-products generated on anaerobic and aerobic conditions, therefore improving the process treatment understanding