期刊名称：Journal of Applied Research in Water and Wastewater
印刷版ISSN：2476-6283
电子版ISSN：2476-6283
出版年度：2021
卷号：8
期号：1
页码：77-87
DOI：10.22126/arww.2021.6499.1214
语种：English
出版社：Razi University
摘要：As a result of population growth and potable water scarcity, an increasing number of reverseosmosis desalination plants are being installed and operated (more than 15,000 in the world).Reverse osmosis membranes tend to reach the end of the life cycle in around two to fiveyears, becoming a solid waste. Recycling/repurposing these aged membranes could be asustainable and profitable solution. This project aimed to transform end-of-life reverseosmosis membranes through the oxidation of their active layer using chlorine intonanoporous/microporous membranes, while searching possible applications for the resultingmembranes. The results show that membranes oxidized at 10,000 ppm.h had a significantincrease in permeability (3.1x), reaching NF-like capacity. On the other hand it was observeda decrease in the rejection of salt (4.35x) and acetaminophen (1.5x). Scanning ElectronMicroscopy (SEM) shows the positive effect of chlorine in the complete removal of particlesdeposited over the membrane. This oxidation condition also increased the average roughness(2.42x) of the membrane, as shown by Atomic Force Microscopy (AFM). Analysis by FourierTransform Reflectance Spectroscopy (FTIR) suggests that chlorine oxidation replaced thehydrogen in the amide nitrogen. Both FTIR and SEM suggests the polyamide layer was notfully degraded. Application tests suggests that the recycled membrane can be used for thetreatment of brackish and surface waters. The recycling of reverse osmosis membranes canbe an alternative to simple landfill disposal, allowing owners to shift from disposal cost torevenue, as well as being a sustainable solution. The high permeability achieved on theseoxidized membranes suggest many other NF/UF functions could potentially use recycled ROmembranes.
关键词：Reverse osmosis;Membrane recycling;Oxidation;Desalination;Membrane second life;Nanofiltration
