Membrane based strategies for the pre-treatment of acid dye bath wastewaters

This paper, as part of a study carried out for the recovery of the acid dye bath wastewaters of a carpet manufactuting industry by membrane processes, describes the evaluation of alternative strategies for the pre-treatment of acid dye bath wastewaters. Dead-end microfiltration (MF) simulating sand filtration with MF media having pore sizes of 2.5. 1.0. 0.45 and 0.2 mu m and ultrafiltration (UF) with an UF membrane having a molecular weight cut off (MWCO) of 50,000 Da were tested in single and sequential stages in order to achieve the best treatment efficiency. Four alternative process trains were tested: single MF, sequential MF, single UF, and MF followed by UF. For both.MF and UF application of sequential filtration did not provide any significant benefit over single processes. In addition. chemical oxygen demand (COD) removal performance of all the alternative processes was similar where the highest removal was only 5%. On the other hand. color removals were much better: ranging front 15 to 100%. even with single ME Comparison of all the process alternatives revealed that. single MF (0.45 mu m). as the simplest process. is the most suitable pre-treatment method for the acid dye bath wastewaters.


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Clean water recovery from the reactive dyeing effluent of a cotton textile mill with membrane filtration was investigated. Lab-scale experiments were performed with wastewater samples taken from the last three steps of the dyeing line, comprising four sequential baths of dyeing, warm rinsing, washing with soap, and lukewarm rinsing. Waste dyeing bath was deliberately excluded considering its extremely high salt and color contents. Two sets of experiments were performed; direct nanofiltration (NF) and NF wit...
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Citation Formats
G. Capar, Ü. Yetiş, and L. Yılmaz, “Membrane based strategies for the pre-treatment of acid dye bath wastewaters,” JOURNAL OF HAZARDOUS MATERIALS, pp. 423–430, 2006, Accessed: 00, 2020. [Online]. Available: