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Water Res. 2015 Sep 1;80:294-305. doi: 10.1016/j.watres.2015.04.041. Epub 2015 May 14.

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

Author information

1
School of Civil, Environmental & Architectural Engineering, Korea University, 1-5 Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-713, Republic of Korea.
2
Energy Laboratory, SAIT, Samsung Electronics, 130 Samsung-ro, Suwon-si, Gyeonggi-do 443-803, Republic of Korea.
3
School of Civil, Environmental & Architectural Engineering, Korea University, 1-5 Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-713, Republic of Korea. Electronic address: skhong21@korea.ac.kr.

Abstract

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.

KEYWORDS:

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

PMID:
26005789
DOI:
10.1016/j.watres.2015.04.041
[Indexed for MEDLINE]

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