A Novel Multi-Charged Draw Solute That Removes Organic Arsenicals from Water in a Hybrid Membrane Process

Environmental Science & Technology
Qingchun GeMinghua Liu

Abstract

The potential of forward osmosis for water treatment can only be maximized with suitable draw solutes. Here a three-dimensional, multicharge draw solute of decasodium phytate (Na10-phytate) is designed and synthesized for removing organic arsenicals from water using a hybrid forward osmosis (FO) - membrane distillation (MD) process. Efficient water recovery is achieved using Na10-phytate as a draw solute with a water flux of 20.0 LMH and negligible reverse solute diffusion when 1000 ppm organic arsenicals as the feed and operated under ambient conditions with FO mode. At 50 °C, the novel draw solute increases water flux by more than 30% with water fluxes higher than 26.0 LMH on the FO side, drastically enhancing water recovery efficiency. By combining the FO and MD processes into a single hybrid process, a 100% recovery of Na10-phytate draw solute was achieved. Crucially, organic arsenicals or Na10-phytate draw solutes are both rejected 100% and not detected in the permeate of the hybrid process. The complete rejection of both organic arsenicals and draw solutes using hybrid membrane processes is unprecedented; creating a new application for membrane separations.

References

Jun 22, 2002·Toxicology Letters·Michael F Hughes
Sep 8, 2007·Environmental Science & Technology·Tielian XuKevin E O'Shea
Mar 28, 2009·Langmuir : the ACS Journal of Surfaces and Colloids·Soh-Fong LimJ Paul Chen
Jan 14, 2012·Water Research·Qingchun GeTai-Shung Chung
Mar 27, 2012·Journal of Hazardous Materials·Xiaohong GuanQinghai Hu
Apr 28, 2012·Environmental Science & Technology·Qingchun GeTai-Shung Chung
Oct 16, 2012·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Nidia Rivera-ReynaAracely Hernández-Ramírez

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Citations

Jul 18, 2019·Environmental Technology·Bizhan BagheriMohammad Mahdi Zerafat
Jul 1, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Sara ArabiValetta Saldanha
Feb 18, 2020·Water Research·Guanglei QiuYen-Peng Ting
Sep 24, 2019·ACS Applied Materials & Interfaces·Xinfei Dong, Qingchun Ge

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