Evaluation of poly (aspartic acid sodium salt) as a draw solute for forward osmosis

Gimun Gwak, Bokyung Jung, Sungsoo Han, Seungkwan Hong

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


Poly (aspartic acid sodium salt) (PAspNa) was evaluated for its potential as a novel draw solute in forward osmosis (FO). The inherent advantages of PAspNa, such as good water solubility, high osmotic pressure, and nontoxicity, were first examined through a series of physicochemical analyses and atomic-scale molecular dynamics simulations. Then, lab-scale FO tests were performed to evaluate its suitability in practical processes. Compared to other conventional inorganic solutes, PAspNa showed comparable water flux but significantly lower reverse solute flux, demonstrating its suitability as a draw solute. Moreover, fouling experiments using synthetic wastewater as a feed solution demonstrated that PAspNa reversely flowed to the feed side reduced inorganic scaling on the membrane active layer. The recyclability of PAspNa was studied using both nanofiltration (NF) and membrane distillation (MD) processes, and the results exhibited its ease of recovery. This research reported the feasibility and applicability of FO-NF or FO-MD processes using PAspNa for wastewater reclamation and brackish water desalination.

Original languageEnglish
Pages (from-to)294-305
Number of pages12
JournalWater Research
Publication statusPublished - 2015 Sept 1


  • Antiscaling
  • Desalination
  • Draw solution
  • Forward osmosis (FO)
  • Wastewater reclamation

ASJC Scopus subject areas

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution


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