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Assessing the removal of organic micro-pollutants from anaerobic membrane bioreactor effluent by fertilizer-drawn forward osmosis

Authors
Kim, YoungjinLi, ShengChekli, LauraWoo, Yun ChulWei, Chun-HaiPhuntsho, SherubGhaffour, NoreddineLeiknes, TorOveShon, Ho Kyong
Issue Date
1-7월-2017
Publisher
ELSEVIER SCIENCE BV
Keywords
Fertilizer-drawn forward osmosis; Fertigation; Anaerobic membrane bioreactor effluent; Organic micro-pollutants; Membrane fouling; Physical cleaning
Citation
JOURNAL OF MEMBRANE SCIENCE, v.533, pp.84 - 95
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
533
Start Page
84
End Page
95
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/82872
DOI
10.1016/j.memsci.2017.03.027
ISSN
0376-7388
Abstract
In this study, the behavior of organic micro-pollutants (OMPs) transport including membrane fouling was assessed in fertilizer-drawn forward osmosis (FDFO) during treatment of the anaerobic membrane bioreactor (AnMBR) effluent. The flux decline was negligible when the FO membrane was oriented with active layer facing feed solution (AL-FS) while severe flux decline was observed with active layer facing draw solution (AL-DS) with di-ammonium phosphate (DAP) fertilizer as DS due to struvite scaling inside the membrane support layer. DAP DS however exhibited the lowest OMPs forward flux or higher OMPs rejection rate compared to other two fertilizers (i.e., mono-ammonium phosphate (MAP) and KCl). MAP and KCl fertilizer DS had higher water fluxes that induced higher external concentration polarization (ECP) and enhanced OMPs flux through the FO membrane. Under the AL-DS mode of membrane orientation, OMPs transport was further increased with MAP and KCl as DS due to enhanced concentrative internal concentration polarization while with DAP the internal scaling enhanced mass transfer resistance thereby lowering OMPs flux. Physical or hydraulic cleaning could successfully recover water flux for FO membranes operated under the AL-FS mode but only partial flux recovery was observed for membranes operated under AL-DS mode because of internal scaling and fouling in the support layer. Osmotic backwashing could however significantly improve the cleaning efficiency.
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