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Water extraction from mixed liquor of an aerobic bioreactor by forward osmosis: membrane fouling and biomass characteristics assessment

Journal Article


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Abstract


  • This study investigated membrane fouling and biomass characteristics during water extraction from mixed liquor of an aerobic bioreactor by a submerged forward osmosis (FO) system. As the sludge concentration in the reactor increased from 0 to 20 g/L, fouling of the FO membrane increased but was much less severe than that of a reference microfiltration membrane. The results also indicate that aeration can be used to effectively control membrane fouling. By increasing the draw solute concentration, as expected, the initial water flux was increased. However, there appears to be a critical water flux above

    which severe membrane fouling was encountered. A short-term osmotic membrane bioreactor experiment showed build-up of salinity in the bioreactor due to the reverse draw solute transport and inorganic salts rejection by the FO membrane. Salinity build-up in the bioreactor reduced the permeate flux and sludge production, and at the same time, altered the biomass characteristics, leading to more soluble microbial products and less extracellular polymeric substances in the microbial mass. Additionally, the inhibitory effects of the increased salinity on biomass and the high rejection capacity of FO led to the build-up of ammonia and ortho-phosphate in the bioreactor.

Publication Date


  • 2015

Citation


  • Luo, W., Hai, F. I.., Price, W. E. & Nghiem, L. D. (2015). Water extraction from mixed liquor of an aerobic bioreactor by forward osmosis: membrane fouling and biomass characteristics assessment. Separation and Purification Technology, 145 55-62.

Scopus Eid


  • 2-s2.0-84924912896

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4582&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3563

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 55

End Page


  • 62

Volume


  • 145

Place Of Publication


  • United Kingdom

Abstract


  • This study investigated membrane fouling and biomass characteristics during water extraction from mixed liquor of an aerobic bioreactor by a submerged forward osmosis (FO) system. As the sludge concentration in the reactor increased from 0 to 20 g/L, fouling of the FO membrane increased but was much less severe than that of a reference microfiltration membrane. The results also indicate that aeration can be used to effectively control membrane fouling. By increasing the draw solute concentration, as expected, the initial water flux was increased. However, there appears to be a critical water flux above

    which severe membrane fouling was encountered. A short-term osmotic membrane bioreactor experiment showed build-up of salinity in the bioreactor due to the reverse draw solute transport and inorganic salts rejection by the FO membrane. Salinity build-up in the bioreactor reduced the permeate flux and sludge production, and at the same time, altered the biomass characteristics, leading to more soluble microbial products and less extracellular polymeric substances in the microbial mass. Additionally, the inhibitory effects of the increased salinity on biomass and the high rejection capacity of FO led to the build-up of ammonia and ortho-phosphate in the bioreactor.

Publication Date


  • 2015

Citation


  • Luo, W., Hai, F. I.., Price, W. E. & Nghiem, L. D. (2015). Water extraction from mixed liquor of an aerobic bioreactor by forward osmosis: membrane fouling and biomass characteristics assessment. Separation and Purification Technology, 145 55-62.

Scopus Eid


  • 2-s2.0-84924912896

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4582&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/3563

Has Global Citation Frequency


Number Of Pages


  • 7

Start Page


  • 55

End Page


  • 62

Volume


  • 145

Place Of Publication


  • United Kingdom