A forward osmosis-membrane distillation hybrid process for direct sewer mining: System performance and limitations

Ming Xie, Long D. Nghiem, William E. Price, Menachem Elimelech

Research output: Contribution to journalArticlepeer-review

175 Citations (Scopus)

Abstract

This study demonstrates the robustness and treatment capacity of a forward osmosis (FO)-membrane distillation (MD) hybrid system for small-scale decentralized sewer mining. A stable water flux was realized using a laboratory-scale FO-MD hybrid system operating continuously with raw sewage as the feed at water recovery up to 80%. The hybrid system also showed an excellent capacity for the removal of trace organic contaminants (TrOCs), with removal rates ranging from 91 to 98%. The results suggest that TrOC transport through the FO membrane is governed by "solute-membrane" interaction, whereas that through the MD membrane is strongly correlated to TrOC volatility. Concentrations of organic matter and TrOCs in the draw solution increased substantially as the water recovery increased. This accumulation of some contaminants in the draw solution is attributed to the difference in their rejection by the FO and MD systems. We demonstrate that granular activated carbon adsorption or ultraviolet oxidation could be used to prevent contaminant accumulation in the draw solution, resulting in near complete rejection (>99.5%) of TrOCs.

Original languageEnglish
Pages (from-to)13486-13493
Number of pages8
JournalEnvironmental Science and Technology
Volume47
Issue number23
Early online date31 Oct 2013
DOIs
Publication statusPublished - 3 Dec 2013

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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