Sequential Use of Advanced Oxidation-Membranes for water treatment

Abstract

Coloring dyes are a huge problem in the recycling of water from the textile, paper, coating, ceramic and other industries where the usage of processing water is extensive and the need for recycling it very high. Performance of a hybrid ultraviolet/hydrogen peroxide (UV/H2O2)–mixed matrix membrane system for an azo dye, acid black 1 [AB1], removal in a water purification process was studied. Different mixed matrix membranes embedded with titanium dioxide (TiO2) nanoparticles, multi-walled carbon nanotubes (MWCNTs), and a mixture of them were fabricated by the phase inversion method. Mixed matrix membranes embedded with MWCNTs resulted in higher pure water flux, and mixed matrix membranes embedded with TiO2 showed lower flux declines in the presence of AB1. However, all the membranes exhibited very low total organic carbon (TOC) rejection and none of the mixed matrix membranes could decolorize the AB1 solution. UV/H2O2 pretreatment of the AB1 solution resulted in enhanced TOC rejection, decolorization, and enhanced antifouling membrane behavior. Combining UV/H2O2 with each type of polysulfone (PSF) mixed matrix membranes (PSF/TiO2, PSF/MWCNT, and PSF/TiO2/MWCNT) resulted in optimal performance in terms of permeation, flux decline, antifouling, rejection, and decolorization. The hybrid process of UV/H2O2-PSF/TiO2/MWCNT mixed matrix membrane resulted in 270 (L/[m2·h]) permeation, 29% flux decline, 90% TOC rejection, 99% decolorization, and 99% flux recovery ratio (FRR%).