Electrically charged forward osmosis: Promoting reverse salt flux to enhance water recovery and struvite precipitation

Kartikeya M. Kekre, Diana Tiburcio, Avner Ronen, Rominder Suri, Gangadhar Andaluri, Heyang Yuan

Research output: Contribution to journalArticlepeer-review

Abstract

Agricultural wastewater contains high concentrations of nitrogen and phosphorus. There is a growing interest in recovering these nutrients. In this study, an electrically charged forward osmosis (eFO) system was developed to recover struvite and water from synthetic livestock wastewater. By applying a voltage near the surface of the FO membrane, magnesium migrated reversely into the feed chamber and reacted with the ammonium and phosphate in the feed solution to form struvite. As a result of electrical charging, the recovery of struvite and water was enhanced by 77% and 39%, respectively. The enhancement might be because dilutive and concentrative polarization was alleviated on the draw and feed side of the FO membrane during ion migration. High external voltage, high draw concentration, and alkaline/neutral draw pH favored water recovery and struvite precipitation. This study provides insights into harnessing reverse salt flux to improve the recovery of nutrients and water in FO systems.

Original languageEnglish
Article number106522
JournalResources, Conservation and Recycling
Volume186
DOIs
StatePublished - 1 Nov 2022

Keywords

  • Forward osmosis
  • Livestock wastewater
  • Reverse salt flux
  • Struvite recovery

ASJC Scopus subject areas

  • Waste Management and Disposal
  • Economics and Econometrics

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