Polyelectrolyte-Promoted Forward Osmosis鈥揗embrane Distillation (FO鈥揗D) Hybrid Process for Dye Wastewater Treatment

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• 作者：Qingchun Ge ; Peng Wang ; Chunfeng Wan ; Tai-Shung Chung
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：June 5, 2012
• 年：2012
• 卷：46
• 期：11
• 页码：6236-6243
• 全文大小：425K
• 年卷期：v.46,no.11(June 5, 2012)
• ISSN：1520-5851

文摘

Polyelectrolytes have proven their advantages as draw solutes in forward osmosis process in terms of high water flux, minimum reverse flux, and ease of recovery. In this work, the concept of a polyelectrolyte-promoted forward osmosis鈥搈embrane distillation (FO鈥揗D) hybrid system was demonstrated and applied to recycle the wastewater containing an acid dye. A poly(acrylic acid) sodium (PAA-Na) salt was used as the draw solute of the FO to dehydrate the wastewater, while the MD was employed to reconcentrate the PAA-Na draw solution. With the integration of these two processes, a continuous wastewater treatment process was established. To optimize the FO鈥揗D hybrid process, the effects of PAA-Na concentration, experimental duration, and temperature were investigated. Almost a complete rejection of PAA-Na solute was observed by both FO and MD membranes. Under the conditions of 0.48 g mL^鈥? PAA-Na and 66 掳C, the wastewater was most efficiently dehydrated yet with a stabilized PAA-Na concentration around 0.48 g mL^鈥?. The practicality of PAA-Na-promoted FO鈥揗D hybrid technology demonstrates not only its suitability in wastewater reclamation, but also its potential in other membrane-based separations, such as protein or pharmaceutical product enrichment. This study may provide the insights of exploring novel draw solutes and their applications in FO related processes.