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Toward resource recovery from wastewater: phosphorus extraction from digested sludge using hybrid forward osmosis - membrane distillation process

Journal Article


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Abstract


  • We demonstrate the simultaneous extraction of

    phosphorus and clean water from digested sludge centrate using a

    forward osmosis (FO)

    membrane distillation (MD) hybrid process.

    In this FO

    MD hybrid process, FO concentrates orthophosphate and

    ammonium for subsequent phosphorus recovery in the form of

    struvite (MgNH

    4

    PO

    4

    ·

    6H

    2

    O), while MD is used to recover the draw

    solution and extract clean water from the digested sludge centrate. A

    decline in water

    fl

    ux was observed during the FO process, but fouling

    was largely reversible after a brief, simple membrane

    fl

    ushing using

    deionized water. The FO process also provides an e

    ff

    ective

    pretreatment capacity to the subsequent MD process, which exhibited

    stable water

    fl

    ux. The use of MgCl

    2

    as the draw solute for the FO

    process is another novel aspect of the system. The reverse salt

    fl

    ux of

    magnesium to the concentrated digested sludge across the FO

    membrane and the di

    ff

    usion of protons away from the digested sludge create favorable conditions for the formation of struvite

    crystals. The precipitates obtained in the hybrid process were veri

    fi

    ed to be struvite crystals by examining the crystal morphology,

    element composition, and crystal structure. Results reported here highlight the potential and robustness of the FO

    MD hybrid

    process for extracting phosphorus from wastewater

Authors


  •   Xie, Ming (external author)
  •   Nghiem, Long D. (external author)
  •   Price, William E.
  •   Elimelech, Menachem (external author)

Publication Date


  • 2014

Citation


  • Xie, M., Nghiem, L. D., Price, W. E. & Elimelech, M. (2014). Toward resource recovery from wastewater: phosphorus extraction from digested sludge using hybrid forward osmosis - membrane distillation process. Environmental Science & Technology Letters, 1 (2), 191-195.

Scopus Eid


  • 2-s2.0-84969157685

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3019&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2010

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 191

End Page


  • 195

Volume


  • 1

Issue


  • 2

Place Of Publication


  • United Arab Emerites

Abstract


  • We demonstrate the simultaneous extraction of

    phosphorus and clean water from digested sludge centrate using a

    forward osmosis (FO)

    membrane distillation (MD) hybrid process.

    In this FO

    MD hybrid process, FO concentrates orthophosphate and

    ammonium for subsequent phosphorus recovery in the form of

    struvite (MgNH

    4

    PO

    4

    ·

    6H

    2

    O), while MD is used to recover the draw

    solution and extract clean water from the digested sludge centrate. A

    decline in water

    fl

    ux was observed during the FO process, but fouling

    was largely reversible after a brief, simple membrane

    fl

    ushing using

    deionized water. The FO process also provides an e

    ff

    ective

    pretreatment capacity to the subsequent MD process, which exhibited

    stable water

    fl

    ux. The use of MgCl

    2

    as the draw solute for the FO

    process is another novel aspect of the system. The reverse salt

    fl

    ux of

    magnesium to the concentrated digested sludge across the FO

    membrane and the di

    ff

    usion of protons away from the digested sludge create favorable conditions for the formation of struvite

    crystals. The precipitates obtained in the hybrid process were veri

    fi

    ed to be struvite crystals by examining the crystal morphology,

    element composition, and crystal structure. Results reported here highlight the potential and robustness of the FO

    MD hybrid

    process for extracting phosphorus from wastewater

Authors


  •   Xie, Ming (external author)
  •   Nghiem, Long D. (external author)
  •   Price, William E.
  •   Elimelech, Menachem (external author)

Publication Date


  • 2014

Citation


  • Xie, M., Nghiem, L. D., Price, W. E. & Elimelech, M. (2014). Toward resource recovery from wastewater: phosphorus extraction from digested sludge using hybrid forward osmosis - membrane distillation process. Environmental Science & Technology Letters, 1 (2), 191-195.

Scopus Eid


  • 2-s2.0-84969157685

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3019&context=eispapers

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/2010

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 191

End Page


  • 195

Volume


  • 1

Issue


  • 2

Place Of Publication


  • United Arab Emerites