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Title: Forward Osmosis Membrane Bioreactor For Water Reuse
Keywords: FO-MBR, draw, water flux, rejection, fouling
Issue Date: 21-Jul-2011
Citation: ZHANG JUNYOU (2011-07-21). Forward Osmosis Membrane Bioreactor For Water Reuse. ScholarBank@NUS Repository.
Abstract: Water is becoming increasingly important as the population over the world continues to grow, which leads to the increasing demand of portable water. It is necessary to reclaim water from used water or wastewater to overcome the water shortage problem through membrane technologies. Forward osmosis membrane bioreactor (FO-MBR) is a combination of forward osmosis (FO) and membrane bioreactor (MBR) to treat wastewater. It requires lower energy compared to the conventional MBR. With a nanofiltration (NF) process as the reconcentration process, clean water is able to be produced. FO-MBR shows a great potential in wastewater treatment, however, there are very few studies on FO-MBR including performance and fouling propensity. In this study, an optimal FO membrane module design was investigated before a suitable draw solution was selected, as it could maximize the effective membrane area for draw solution to transport water. Thereafter, a suitable draw solution was selected with this module design and used in the wastewater treatment process to investigate the performance and fouling mechanism of the FO-MBR. Three FO membrane modules were chosen to study the water fluxes and reverse salt fluxes in the FO process. The results of water fluxes showed that the 6-chamber FO membrane module was able to achieve highest water flux among the three modules. The results of the reverse salt flux showed that 3 different FO membrane modules all generated a reverse salt flux lower than 1 g m-2 h-1, which was because of the highly selective FO membrane. Therefore, 6-chamber FO membrane module was the best design for the FO-MBR among the three designs. FO membrane module design plays an important role in transporting water through optimizing the effective membrane area and therefore improving the water productivity. Very limited studies were conducted on FO module design. Thus, this study provides information on the effect of FO module design on water productivity.
Appears in Collections:Master's Theses (Open)

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