Membrane and Water Treatment

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Reuse potential of spent RO membrane for NF and UF process

  • Ng, Zhi Chien (Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia) ;
  • Chong, Chun Yew (Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia) ;
  • Sunarya, Muhammad Hamdan (School of Applied Science, Republic Polytechnic) ;
  • Lau, Woei Jye (Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia) ;
  • Liang, Yong Yeow (Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang) ;
  • Fong, See Yin (Oneness Water Sdn Bhd) ;
  • Ismail, Ahmad Fauzi (Advanced Membrane Technology Research Centre (AMTEC), Universiti Teknologi Malaysia)
  • Received : 2019.12.23
  • Accepted : 2020.06.30
  • Published : 2020.09.25
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Abstract

With the increasing demand on reverse osmosis (RO) membranes for water purification worldwide, the number of disposed membrane elements is expected to increase accordingly. Thus, recycling and reuse of end-of-life RO membranes should be a global environmental action. In this work, we aim to reuse the spent RO membrane for nanofiltration (NF) and ultrafiltration (UF) process by subjecting the spent membrane to solvent and oxidizing solution treatment, respectively. Our results showed that solvent-treated RO membrane could perform as good as commercial NF membrane by achieving similar separation efficiencies, but with reduced water permeability due to membrane surface fouling. By degrading the polyamide layer of RO membrane, the transformed membrane could achieve high water permeability (85.6 L/㎡.h.bar) and excellent rejection against macromolecules (at least 87.4%), suggesting its reuse potential as UF membrane. More importantly, our findings showed that in-situ transformation on the spent RO membrane using solvent and oxidizing solution could be safely conducted as the properties of the entire spiral wound element did not show significant changes upon prolonged exposure of these two solutions. Our findings are important to open up new possibilities for the discarded RO membranes for reuse in NF and UF process, prolonging the lifespan of spent membranes and promoting the sustainability of the membrane process.

Keywords

Acknowledgement

The authors would like to thank Universiti Teknologi Malaysia (UTM) for providing UTMSHINE Signature Research Grant (Vot no. Q.J130000.2451.07G79) to financially support the research work conducted.

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