Minimização de efluentes em uma fábrica de polpa kraft lo-solids® branqueada de eucalipto

• Autor(a) principal: Moreira, Leandro de Jesus
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/5903
• topic: Efluentes; Fábrica de polpa kraft; Polpa kraft Lo-Solids branqueada; Effluent; Kraft pulp mill; Lo-solids bleached kraft pulp; CNPQ::CIENCIAS AGRARIAS::RECURSOS FLORESTAIS E ENGENHARIA FLORESTAL::TECNOLOGIA E UTILIZACAO DE PRODUTOS FLORESTAIS::TECNOLOGIA DE CELULOSE E PAPEL

Historically, the pulp and paper industry has been one of the largest consumers of natural resources. The volume of water consumed in the sector reaches an average value of about 25 to 100 m3 per ton of pulp produced. Among the stages that comprise the kraft process, the bleaching plant is the largest source of liquid effluent generation. Reducing effluent generation, through partial or total system closure, significantly reduces fresh water consumption and brings benefits in terms of reduction of environmental pollution. The purpose of this work was to evaluate the feasibility of reducing fresh water consumption in the bleaching system, through the recirculation of bleaching filtrates. From the current conditions of pulp process of Lwarcel Celulose Ltda, which has total effluent generation of 22 m3/adt, two degrees of closure were analyzed, generation 19,5 and 17,5 m3/tsa. Based on these conditions, the final product quality, concentration and influence of non-process elements (NPEs) in the circuit, reagent consumption on bleaching and concentration of effluent generation were analyzed. Results indicate that as the circuit was closed, the concentration of non-process elements (NPEs) was increased in the system and only one alternative analyzed meets pulp quality requirements.