Integration of Nanofiltration Hollow Fiber Membranes with Coagulation鈥揊locculation to Treat Colored Wastewater from a Dyestuff Manufacturer: A Pilot-Scale Study

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• 作者：Can-Zeng Liang ; Shi-Peng Sun ; Bai-Wang Zhao ; Tai-Shung Chung
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：November 11, 2015
• 年：2015
• 卷：54
• 期：44
• 页码：11159-11166
• 全文大小：449K
• ISSN：1520-5045

文摘

A positively charged nanofiltration (NF) hollow fiber membrane with an antifouling feature has been fabricated and scaled up to pilot scale to treat colored wastewater from a dyestuff manufacturer with the aid of the coagulation鈥揻locculation (CF) process. An effective CF formulation, i.e., iron chloride/anionic polyacrylamide (IC/APAM) = 800/100 ppm, has been identified to treat the NF concentrate stream. The challenges of membrane fouling and processing concentrate streams can be effectively managed by the integrated NF鈥揅F process. The NF process is able to achieve 82% and 67% removal of color and chemical oxygen demand (COD) from the colored wastewater, respectively; while the CF process can remove 91% of color and 81% of COD from the NF concentrate stream. NF and CF were found to complement each other. The NF process alone always generates a concentrate stream, but it can effectively reduce the wastewater volume. The CF processes are particularly favorable for treating small volume concentrate streams. These advantages make the NF鈥揅F process propitious for users located in land- or space-limited places and countries.