Remoção de células de Microcystis Aeruginosa em água de abastecimento por coagulação, floculação e sedimentação utilizando cloreto férrico e sulfato de alumínio e filtração por filtro de areia

• Ano de defesa: 2014
• Autor(a) principal: Oliveira, Erivanna Karlene dos Santos
• Orientador(a): Ceballos, Beatriz Suzana Ovruski de
• Banca de defesa: Rodrigues, Andrea Carla Lima , Vieira, Fernando Fernandes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual da Paraíba
• Programa de Pós-Graduação: Mestrado em Ciência e Tecnologia Ambiental - MCTA
• Departamento: Tecnologia Ambiental
• País: BR
• Palavras-chave em Português: Microcystis aeruginosa; Coagulação; Sulfato de alumínio; Cloreto férrico
• Área do conhecimento CNPq: CNPQ::CIENCIAS HUMANAS::GEOGRAFIA
• Link de acesso: http://tede.bc.uepb.edu.br/tede/jspui/handle/tede/2056

The presence of cyanobacteria in reservoirs, lakes and rivers is a global environmental health problem as a result ofanthropogenic eutrophication. These microorganisms hinder water purifiers, to produce taste and odor difficult to remove and the cells at high density clog the sand filters, reducing its time of use. In the conventional method of water treatment, coagulation, flocculation and sedimentation are essential in the removal of cells and determine the efficiency of the following operations. In this study we analyzed the efficiency of removal of intact cells of Microcystis aeruginosaand microcystin-LR in the stages of coagulation, flocculation and sedimentation, followed by filtration through sand filters with the use of coagulants ferric chloride and aluminum sulfate, evaluating four filtration rates: 15, 30, 50 and 100 m 3 .m -2 .d -1 at pH 7.5 and a dosage of 40 mg.L -1 tests with a bench-scale (Jartest) using treated water dechlorinated and adadded with a pureculture of M. aeruginosa with approximate final densityof 10 cel.mL -1 simulating a bloom. The parametres control were turbidity, apparent color and cell concentration. It was observed that both the efficiency rates at 15 and 30 m 1 had similar removal of apparent color, turbidity and cellconcentration (79%, 80% and 92% and 80%, 80,5% and 89,10% respectively for the coagulant ferric chloride. And for aluminum sulphate was the same for both rates removals of 81,48% for apparent color, turbidity to 83,25% and to 90,50% for cell concentration, since the rate for 30 m 1 removals were 83,33%, 83,25% and 89,71%, respectively. Nocell lysiswas observedandconsequently, no further increases in concentrationsofmicrocystin-LR cyanotoxinduring treatment was observed.