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O efluente gerado no processo produtivo de curtimento de couro e rico em material orgânico, sal, sulfetos, corante, cromo potencialmente toxico, entre outros poluentes que causam impactos ao solo, agua e ar. O tratamento mais comum dado ao efluente de curtume consiste em gradeamento e retencao de gordura seguido de coagulacao, floculacao, decantacao e aplicacao de lodos ativados. O objetivo do presente estudo foi tratar o efluente de curtumes por meio do processo de coagulacao/floculacao/decantacao com o coagulante natural tanino. O pH do efluente foi ajustado para 7,0 e as concentracoes de tanino testadas variaram de 0,6 a 3,6 g/L. Apos a decantacao, foi coletado o sobrenadante e analisado em termos de remocao de DQO, cor e turbidez. Pode-se observar que houve eficiencia na remocao de quase 100% de cor e turbidez utilizando tanino. Em relacao a DQO, as remocoes foram menores que as remocoes de cor e turbidez, ficando em torno de 50%. PALAVRAS-CHAVE: Efluente de curtume; coagulacao/floculacao/decantacao; coagulante natural. EVALUATION OF THE TANNIN USING IN PH NEUTRAL IN THE TANNERY WASTEWATER TREATMENT ABSTRACT The effluent generated in the production process of tanning leather is rich in organic material, salt, sulfides, dye, potentially toxic chromium, among other pollutants that cause impacts to soil, water and air. The most common treatment of the tannery wastewater consists of railing and fat retention followed by coagulation, flocculation, sedimentation and application of activated sludge. The aim of this study was to treat the effluent from tanneries through coagulation/flocculation/sedimentation with the natural coagulant tannin. The effluent pH was adjusted to 7.0 and tannin concentrations tested ranged from 0.6 to 3.6 g/l. After decantation, the supernatant was collected and analyzed in terms of COD removal, color and turbidity. It was observed that removal efficiency was almost 100% of color and turbidity removal using tannin. Regarding COD removals were lower than the color and turbidity, getting around 50%. KEY-WORDS : Tannery effluent. Coagulation/flocculation/sedimentation. Natural coagulant. EVALUACION DEL USO DE TANINO PH NEUTRO EN EL TRATAMIENTO DE AGUAS RESIDUALES DE BRONCEADO RESUMEN El efluente generado en el proceso de produccion de cuero curtido es rico en materia organica, sal, sulfuros, tinte, potencialmente toxicos de cromo, entre otros contaminantes que causan impactos al suelo, agua y aire. El tratamiento mas comun de las aguas residuales curtiduria consta de barandilla y la retencion de la grasa seguido por coagulacion, floculacion, sedimentacion y la aplicacion de lodos activados. El objetivo de este estudio fue para tratar el efluente de las curtidurias a traves de la coagulacion/floculacion/sedimentacion con proceso de tanino natural coagulante. El pH del efluente se ajusto a 7,0 y el tanino concentraciones ensayadas oscilaron entre 0,6 y 3,6 g / l. Despues de la decantacion, el sobrenadante se recoge y se analiza en terminos de remocion de DQO, color y turbidez. Se observo que la eficiencia de eliminacion era casi 100% de color y turbidez usando tanino. En cuanto a las extracciones de DQO fueron mas bajos que el color y la turbidez, obteniendo alrededor del 50%. PALABRAS-CLAVE: Aguas residuales de curtiembre. Coagulacion/floculacion/sedimentacion. Coagulante natural.

AVALIAÇÃO DO USO DE TANINO EM PH NEUTRO NO TRATAMENTO DE EFLUENTE DE CURTUME