Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater
AbstractPre-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. View Full-Text
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Fujioka, T.; Nguyen, K.H.; Hoang, A.T.; Ueyama, T.; Yasui, H.; Terashima, M.; Nghiem, L.D. Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater. Int. J. Environ. Res. Public Health 2018, 15, 2124.
Fujioka T, Nguyen KH, Hoang AT, Ueyama T, Yasui H, Terashima M, Nghiem LD. Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater. International Journal of Environmental Research and Public Health. 2018; 15(10):2124.Chicago/Turabian Style
Fujioka, Takahiro; Nguyen, Kha H.; Hoang, Anh T.; Ueyama, Tetsuro; Yasui, Hidenari; Terashima, Mitsuharu; Nghiem, Long D. 2018. "Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater." Int. J. Environ. Res. Public Health 15, no. 10: 2124.
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