Electro-flocculation associated with the extract of Moringa oleifera Lam as natural coagulant for the removal of reactive blue 5G dye/Aplicacao da eletrofloculacao associada ao extrato de Moringa oleifera Lam como coagulante natural para remocao do corante reativo azul 5G

• Published in: Acta scientiarum. Technology 2016-10, p.483
• Main Authors: dos Santos, Bruna Souza, Eyng, Eduardo, Stival Bittencourt, Paulo Rodrigo, Mantovani Frare, Laercio, de Moraes Flores, Eder Lisandro, Budke Costa, Michelle
• Format: Article
• Language: Spanish
• ISSN: 1806-2563
• DOI: 10.4025/actascitechnol.v38i4.28796

Although an important significant sector in world economy, the textile industry is known for its large volumes of wastewater generated in production processes. In the search for cleaner technologies, the application of electrochemical processes, such as electro-flocculation, or natural coagulants, such as Moringa oleifera Lam extract, have become recurrent in literature. Since the required operating conditions for alternative technologies are such that they hamper effective application, current paper presents results obtained with the use of a hybrid system of treatment which combines electro-flocculation and the aqueous extract of Moringa oleifera lam to evaluate the removal of reactive blue 5G dye from aqueous solutions. Milder conditions of electric current intensity (0.10-1.50 A) and natural coagulant concentration (250-2000 mg [L.sup.-1]) were tested. Through a Central Composite Rotatable Design, it was possible to obtain a quadratic model which subsidized the optimization of operating conditions. Applying an electric current of 0.97 A to sacrificial electrodes of iron and a concentration of 2000 mg [L.sup.-1] for the extract of Moringa oleifera Lam, an average 86.79% color removal was obtained, considered a satisfactory rate. Keywords: textile effluent, electrochemical treatment, optimization. A industria textil, apesar de representar um importante setor para a economia mundial, tambem e conhecida pelos grandes volumes de aguas residuarias geradas no seu processo produtivo. Na busca por tecnologias mais limpas de tratamento, aplicacoes de processos eletroquimicos, como a eletrofloculacao, ou ainda de coagulantes naturais, como o extrato de Moringa Oleifera Lam, tem se tornado recorrente na literatura. Entretanto, por vezes as condicoes operacionais exigidas por estas tecnologias alternativas inviabilizam sua aplicacao efetiva. Neste contexto, o presente trabalho apresenta os resultados obtidos com o emprego de um sistema hibrido de tratamento, conciliando a eletrofloculacao a adicao de extrato aquoso de Moringa Oleifera Lam, avaliando-se a remocao do corante reativo Azul 5G de solucoes aquosas. Foram testadas condicoes mais brandas de intensidade de corrente eletrica (0,10-1,50 A) e concentracao de coagulante natural (250-2000 mg [L.sup.-1]). Por meio de um Delineamento Composto Central Rotacional foi possivel obter um modelo quadratico, que subsidiou a otimizacao das condicoes operacionais. Aplicando-se a corrente eletrica de 0,97 A aos eletrodos de