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Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater

Author

Listed:
  • Takahiro Fujioka

    (Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan)

  • Kha H. Nguyen

    (R&D Division, Kyowakiden Industry Co., Ltd., 10-2 Kawaguchi-Machi, Nagasaki 852-8108, Japan)

  • Anh Tram Hoang

    (Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan)

  • Tetsuro Ueyama

    (Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
    R&D Division, Kyowakiden Industry Co., Ltd., 10-2 Kawaguchi-Machi, Nagasaki 852-8108, Japan)

  • Hidenari Yasui

    (Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan)

  • Mitsuharu Terashima

    (Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan)

  • Long D. Nghiem

    (Centre for Technology in Water and Wastewater, University of Technology Sydney, Ultimo NSW 2007, Australia)

Abstract

Pre-concentration is essential for energy and resource recovery from municipal wastewater. The potential of forward osmosis (FO) membranes to pre-concentrate wastewater for subsequent biogas production has been demonstrated, although biofouling has also emerged as a prominent challenge. This study, using a cellulose triacetate FO membrane, shows that chloramination of wastewater in the feed solution at 3–8 mg/L residual monochloramine significantly reduces membrane biofouling. During a 96-h pre-concentration, flux in the chloraminated FO system decreased by only 6% and this flux decline is mostly attributed to the increase in salinity (or osmotic pressure) of the feed due to pre-concentration. In contrast, flux in the non-chloraminated FO system dropped by 35% under the same experimental conditions. When the feed was chloraminated, the number of bacterial particles deposited on the membrane surface was significantly lower compared to a non-chloraminated wastewater feed. This study demonstrated, for the first time, the potential of chloramination to inhibit bacteria growth and consequently biofouling during pre-concentration of wastewater using a FO membrane.

Suggested Citation

  • Takahiro Fujioka & Kha H. Nguyen & Anh Tram Hoang & Tetsuro Ueyama & Hidenari Yasui & Mitsuharu Terashima & Long D. Nghiem, 2018. "Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater," IJERPH, MDPI, vol. 15(10), pages 1-11, September.
    • Handle: RePEc:gam:jijerp:v:15:y:2018:i:10:p:2124-:d:172253
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