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Author(s): M. J. Ferreira
M. F. Almeida
S. Pinho
A. Neves
Title: Alternative treatments for footwear industry liquid effluents. Part 1 Classic approach
Issue Date: 2002
Abstract: The footwear industry generates small volumes of non-biodegradable liquido effluents from finishing operations which have a high organic load, mainly due to pigments, organic acids and organic solvents. In consequence, these effluents must be treated to accomplish regulatory requirements before discharge. One of the treatment alternatives is coagulation/flocculation, a well-known treatment for removing fine particles and colloids. Tests carried out using lime, aluminum sulphate, ferric chloride and ferric sulphate as coagulants gave chemical oxygen demand (COD) and 5-day biochemical oxygen demand (BOD5) removals over 80-90%. However, despite this efficiency, some of the effluent characteristics are still higher than those imposed for discharge to surface waters, land or sewage systems. A polishing step using activated carbon adsorption is then required to permit the discharge to sewage systems, but the quantities of adsorbent required casts some doubt on the feasibility of the process.
Description: A indústria do calçado gera pequenas quantidades de efluentes líquidos não biodegradáveis devido a pigmentos, ácidos orgânicos e solventes. Uma aternativa de tratamento testado é a coagulação/floculação usando cal, sulfato de alumínio, cloreto férrico e sulfato férrico. Os resultados são 80-90% de redução na CQO e CBO5. Contudo o efluente não tem condições de descarga e exige uma etapa de polimento. Usando carvão activado as quantidades exigidas são muito elevadas.
Subject: Ciências Tecnológicas, Outras ciências da engenharia e tecnologias
Technological sciences, Other engineering and technologies
Scientific areas: Ciências da engenharia e tecnologias::Outras ciências da engenharia e tecnologias
Engineering and technology::Other engineering and technologies
Document Type: Artigo em Revista Científica Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Revista Científica Internacional

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