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Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater.


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.

SUBMITTER: Fujioka T 

PROVIDER: S-EPMC6210331 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater.

Fujioka Takahiro T   Nguyen Kha H KH   Hoang Anh Tram AT   Ueyama Tetsuro T   Yasui Hidenari H   Terashima Mitsuharu M   Nghiem Long D LD  

International journal of environmental research and public health 20180927 10


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-  ...[more]

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