Color and COD retention by nanofiltration membranes

• Published in: Desalination Vol. 172; no. 1; pp. 77 - 83
• Main Authors: Lopes, Cristiane N., Petrus, José Carlos C., Riella, Humberto G.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2005; Elsevier
• Subjects: Applied sciences; Chemical engineering; Color and COD removal; Exact sciences and technology; Fouling; General purification processes; Membrane separation (reverse osmosis, dialysis...); Nanofiltration membranes; Pollution; Textile wastewater; Wastewaters; Water reuse; Water treatment and pollution; Color and COD removal; Textile wastewater; Fouling; Water reuse; Nanofiltration membranes; Membrane separation; Nanofiltration; Chemical oxygen demand; Industrial waste water; Color; Reuse; Crossflow; Retention; Spiral; Textile industry; Waste water
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2004.07.030

In the present study the application of the nanofiltration process was investigated mainly in the retention ofcolor and chemical oxygen demand (COD) present in textile industry wastewater. Nanofiltration experiments were carried out in a pilot unit, operating in crossflow. Three different types of spiral wound membranes, DK 1073, NF 45 and MPS 31 were used simultaneously in the same unit. The results of the tests showed that for color retention, the values were around 99% for the DK 1073 and NF 45 membranes and the 87% for COD retention for the DK 1073. The permeate flux for the different wastewaters varied from 30.5 to 70 L/h.m 2. Fouling was observed in all membranes due to the accumulation of molecular species close to the filtering surface. The process was efficient and promising for the reuse of wastewater from this type of industry.