Resumo: O principal objetivo deste trabalho foi avaliar a eficiência de um sistema de tratamento de efluentes têxteis composto pelos processos eletrocoagulação (EC) e foto-Fenton solar (FFS) integrados. Utilizando reatores de escala laboratorial, do tipo sequencial, o efluente têxtil foi tratado pela EC seguido pelo processo FFS. Os parâmetros operacionais do reator FFS foram otimizados realizando um delineamento experimental 3 3 completo, seguido da análise estatística dos dados obtidos. O efluente têxtil bruto apresentou uma coloração preta, turbidez moderada, alta alcalinidade e elevada carga orgânica (DQO = 1636 mg O 2 L -1 , COT = 638 mg C L -1 ). Em 20 min os processos integrados EC/FFS apresentaram reduções de 99,5% da DQO, 96% do COT, 99,9% da cor e da turbidez, atendendo os valores máximos permitidos pela legislação brasileira para despejo de efluentes em corpos hídricos receptores. Assim, a integração dos processos EC/FFS mostrou-se uma alternativa eficaz no tratamento de efluente têxtil.Palavras-chave: efluente têxtil; integração de processos; eletrocoagulação; foto-Fenton.Abstract: This paper aimed to evaluate the efficacy of an integrated textile wastewater treatment system based on both electrocoagulation and solar photo-Fenton processes. A sequential-type, lab-scale reactors system was built and used. By performing a complete experimental design 3 3 , analyzing second order models for some response variables such as Chemical Oxygen Demand, Turbidity and color as well as an ANOVA evaluation, the set of operating photo-Fenton reactor parameters was optimized. High contents of organic matter, intense dark color, moderate turbidity and high alkalinity are characteristics of textile wastewater samples. High performance in COD, DOC, color and turbidity removal was attended by the integrated textile wastewaters treatment system operated in 20 min and set at optimized operating reactors parameters, with their final concentrations below the maximum allowed limits recommended by the Brazilian environmental legislation. Thus, an integration of electrocoagulation and photo-Fenton processes is an alternative effective method on removals of main pollutants of textile effluents.
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