Des essais de traitement d'effluents de l'industrie textile par coagulation-floculation, nanofiltration et par combinaison coagulation-floculation-nanofiltration ont été effectués. Les résultats montrent que la coagulation-floculation par le sulfate d'aluminium conduit à des abattements de la matière organique de 87% de DCO et de la turbidité de 98% pour une dose de 1,7 g/l d'aluminium élémentaire. Cette méthode de traitement ne permet pas d'éliminer la matière organique soluble ainsi que les sels. Par contre, les résultats de la nanofiltration et de la combinaison coagulation-floculation-nanofiltration ont montré que cette dernière méthode conduit à des abattements de la matière organique de 98% de DCO et des sels de 99,9%. Industrie / textile / rejet / nanofiltration / coagulation-floculation.Treatment of textile effluent by the process coagulationfloculation-nanofiltration. Many attempts of treatment of the effluent of textile industry by coagulation-floculation, nanofiltration and by combined coagulation-floculation-nanofiltration were realised. The results shows that coagulation-floculation loading to reduction of the organic matter of 87% of COD and the turbidity of 98% for a dose of 1.7 g/l of elementary aluminium, but does not eliminate the soluble organic matter and the salts.Then, the membrane filtration process offers an alternative effluent treatment.To avoid the colmatation of the membrane module, we chosed to treat the textile effluent by coagulationfloculation.The solution in the dye bath goes directly to the nanofiltration unit, where the soluble contaminants are retained. Hence, clear water is produced. On other hand, the results of nanofiltration and of combined process coagulation-floculation-nanofiltration showed that last method leads to rejection of the organic matter of 98% of COD and salts of 99,9%. Since, the clear water was produced that can be recycled in company.
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