Nanofiltration hollow fiber membranes for textile wastewater treatment: Lab-scale and pilot-scale studies

作者：Ong Yee Kang; Li Fu Yun; Sun Shi Peng; Zhao Bai Wang; Liang Can Zeng; Chung Tai Shung^*

来源：Chemical Engineering Science, 2014, 114: 51-57.

DOI：10.1016/j.ces.2014.04.007

• Nanofiltration
• Textile wastewater
• Hollow fiber membrane
• Pilot-scale
• Dyes
• Chemical oxidation demand (COD)

The textile industry is a water intensive industry that generates a vast amount of wastewater. The wastewater generated from the textile industry is generally loaded with pollutants comprising spent textile dyes, suspended solids, mineral oils, electrolytes, surfactants, etc. Therefore, it must be properly treated before disposal or reuse. A systematic study was conducted to evaluate the performance of newly developed polyamide-imide hollow fiber nanofiltration (NF) membrane in various operating conditions such as feed temperature (i.e., 25, 40, 50, 70 degrees C), solute concentration (i.e., 100, 500,1000 ppm) and pH (i.e., 3, 7, 10). The results indicate that the NF membrane has satisfactory rejections (average: > 90%) against various dyes at most testing conditions. In addition, more than 80% of NaCl and 90% of Na2SO4 permeate through the membrane. As a result, these salts have the potential to be be recovered and reused for the next dyeing process. The robustness of the membrane was proven by showing satisfactory and stable performance under cycles of chemical cleaning during the lab-scale and pilot-scale evaluations.

• 出版日期2014-7-26