Processos de Tratamento Terciário para Redução da DQO e Cor dos Efluentes de uma Fábrica Integrada de Celulose Kraft Branqueada e Papel

• Autor(a) principal: Araújo, José Eduardo
• Data de Publicação: 2013
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5937
• topic: Redução de DQO; Efluente; Celulose Kraft; Reduction of COD; Effluent; Pulp Kraft; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS::TECNOLOGIA DE CELULOSE E PAPEL

The present work presents a technical and economical comparison among several terciary treatments for COD and color removal of a bleached kraft pulp and paper mill secondary effluent. Lab tests were carried out simulating two treatments: conventional physico-chemical (coagulation/flocculation/flotation) and oxidation. Flocculants used were aluminum sulfate Al2(SO4)3, Aluminum polychloride (PAC) and ferric chloride (FeCl3). For oxidation tests it was used ozone (O3) and Chlorine dioxide (ClO2). The best physico-chemical treatment option was the use of aluminuum sulfate with an optimum dosage of 600 mg L-1 which provided a color removal of 84% and a cost of 0.24 US$ kg-1 of color and a COD reduction of 56% resulting in a estimated cost of 0.49US$ kg-1. It also resulted in a sludge generation of 0,34 kg m-3 of treated effluent. Although the use of PAC and FeCl3 resulted in excellent performance with a lower dosage (200 mg L-1), the costs were much higher than the aluminum sulfate. Both oxidative processes tested present very low performance to reduce color and COD in the tested conditions and therefore not technically and economically feasible.