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The forward osmosis membrane bioreactor: A low fouling alternative to MBR processes
被引:618
作者:
Achilli, Andrea
[1
]
Cath, Tzahi Y.
[2
]
Marchand, Eric A.
[1
]
Childress, Amy E.
[1
]
机构:
[1] Univ Nevada, Dept Civil & Environm Engn, Reno, NV 89557 USA
[2] Colorado Sch Mines, Environm Engn & Sci Div, Golden, CO 80401 USA
关键词:
Membrane bioreactor;
Forward osmosis;
Membrane fouling;
Wastewater treatment;
Nutrient removal;
WASTE-WATER;
REVERSE-OSMOSIS;
PREDICTION;
D O I:
10.1016/j.desal.2008.02.022
中图分类号:
TQ [化学工业];
学科分类号:
0817 ;
摘要:
A novel osmotic membrane bioreactor(OsMBR) is presented. The system utilizes a submerged forward osmosis (FO) membrane module inside a bioreactor. Through osmosis, water is transported from the mixed liquor across a semi-permeable membrane, and into a draw solution (DS) with a higher osmotic pressure. To produce potable water, the diluted DS is treated in a reverse osmosis (RO) unit; the by-product is a reconcentrated DS for reuse in the FO process. Preliminary results from experiments conducted with a flat-sheet cellulose triacetate FO membrane demonstrated high sustainable flux and relatively low reverse transport of solutes from the DS into the mixed liquor. Membrane fouling was controlled with osmotic backwashing. The FO membrane was found to reject 98% of organic carbon and 90% of ammonium-nitrogen; the OsMBR process (bioreactor and FO membrane) was found to remove greater than 99% of organic carbon and 98% of ammonium-nitrogen, respectively; suggesting a better compatibility of the OsMBR with downstream RO systems than conventional membrane bioreactors.
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页码:10 / 21
页数:12
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