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The use of organic EDA and EDTA as draw solutes in forward osmosis

Authors： WANG Hao1, HE Tao2, LI Xuemei2, Lin Xiao1

Units： 1.State Key lab of Material-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, Nanjing 21009, China; 2. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China

KeyWords： EDA; EDTA; Draw solutes; Forward osmosis

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2013,33(6):87-91

Abstract：

Forward osmosis uses the osmotic pressure difference across a semipermeable membrane as the driving force for the concentration and desalination of the feed solution. Although the development of FO processes has drawn a lot of attention for its energy-efficiency and high water recovery rate, the FO flux is far below theoretical prediction because of internal concentration polarization and high salt leakage in the FO process. In this report, organic chemicals, ethylenediamine (EDA) and ethylenediaminotetraacetate (EDTA), are used as the draw solutes for forward osmosis and compared with NaCl. The osmotic pressure, FO flux with different membrane orientation, and reverse solute flux were measured using commercial HTI membranes. It was found that in the AL-DS mode, at draw solution concentration of 0.5 mol/L, FO water fluxes were 14.5, 12.8, and 12.5 L•m2•h-1, specific reverse solute flow rate (Js/Jw) were 0.3, 1.1, 1.0 g/L for EDTA , EDA, and NaCl, respectively. The reasons behind the very low reverse solute flow of EDTA were analyzed and ascribed to its larger hydration diameter and possibly negative net charges. These results showed that the organic draw solutes are promising as draw solutes for forward osmosis.

Funds：

国家重大基础研究973项目 (No. 2012CB623402 2012CB720903), 自然科学基金项目(21176119)

AuthorIntro：

王皓(1987-)，男，甘肃武威人，硕士，南京工业大学，主要研究方向为正渗透驱动溶质；通讯联系人：email: linx@njut.edu.cn ; het@sari.ac.cn

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