Biofouling Mitigation by Chloramination during Forward Osmosis Filtration of Wastewater

International Journal of Environmental Research and Public Health

AnhTram Hoang¹  LongD. Nghiem²  Mitsuharu Terashima²  Tetsuro Ueyama³  Hidenari Yasui³  Takahiro Fujioka³  KhaH. Nguyen⁴ 

[1] D Division, Kyowakiden Industry Co., Ltd., 10-2 Kawaguchi-Machi, Nagasaki 852-8108, Japan;Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan;Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan;;R&

关键词: chloramine;    forward osmosis;    membrane fouling;    pre-concentration;    wastewater treatment;   

DOI  :  10.3390/ijerph15102124

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown