Avaliação ecotoxicológica de efluentes de celulose branqueada de eucalipto ao longo do tratamento biológico

• Autor(a) principal: Martins, Daniel Von Rondon
• Data de Publicação: 2008
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/3709
• topic: Ecotoxicidade; Efluente de celulose; Tratamento biológico; Eco-toxicity; Pulp mill effluents; Biological treatment; CNPQ::ENGENHARIAS::ENGENHARIA SANITARIA::TRATAMENTO DE AGUAS DE ABASTECIMENTO E RESIDUARIAS::ESTUDOS E CARACTERIZACAO DE EFLUENTES INDUSTRIAIS

In this work the toxicity of bleached eucalypt pulp mill effluents was assessed. First, a physical-chemical characterization of the samples was done at different points along the treatment. Then the samples were submitted to toxicity tests with four monitor organisms. For the acute toxicity assessment Vibrio fischeri (Microtox® system) and Daphnia similis were used, while the chronic toxicity test was performed with Ceriodaphnia dubia and Pseudokirchneriella subcapitata. The experiments were done on the Eco-toxicity Laboratory, created on the Water and Waste Division located on the UFV campus. Cultivation conditions were standardized and tests were developed for the organisms Daphnia similis, Ceriodaphnia dubia, and Pseudokirchneriella subcapitata. The results indicate that there is no acute toxicity in the effluent. On the other hand, chronic toxicity was detected when higher concentrations of the effluent were used in the assay with Ceriodaphnia dubia. The treated effluent presents a EC50 = 73,5% to the above crustacean and a negative reproductive effect was observed with a chronic value (CV) of 71%. However, when the dilution factor, which is calculated according to the resolution SMA-3/2000 of Secretaria do Meio Ambiente do Estado de São Paulo , was considered on the water body, the chronic effect to Ceriodaphnia dubia was not significant. Finally, the treated effluent stimulated the growth of the green algae Pseudokirchneriella subcapitata raising the concern of water body eutrofization.