Concurrent Nitrogen and Phosphorus Recovery Using Flow-Electrode Capacitive Deionization

Yanhong Bian, Xi Chen, Lu Lu, Peng Liang, Zhiyong Ren

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

This study presents that flow-electrode capacitive deionization (FCDI) can concurrently remove salts and nutrient ions from wastewater effluent and recover them as concentrate efficiently. Compared with complex biological nutrient removal, this electrochemical method utilizes the ionic nature of salts and nutrient species (NH 4 + -N, NO 3 - -N, PO 4 3- -P) to enable simple nutrient removal and desalination. The FCDI with separated anode and cathode (FCDI-S) removed 70-98.5% salinity, 49-91% PO 4 3- -P, 89-99% NH 4 + -N, and 83-99% NO 3 - -N under the 5-15 wt % electrode loadings. When a reverse potential was applied, more than 80% of the removed nutrient ions were recovered in the concentrate during discharging operation. Furthermore, when connected flow operation (FCDI-C) was implemented that allowed external electrode mixing, more adsorption sites were freed up, which resulted in 43.5 ± 2.2% increase in PO 4 3- -P removal, 12.3 ± 1.1% increase in NH 4 + -N removal, and 9.9 ± 0.3% increase in NO 3 - -N removal. This electrochemical method provides a new alternative nutrient removal and recovery solution especially for distributed applications.

Original languageEnglish (US)
Pages (from-to)7844-7850
Number of pages7
JournalACS Sustainable Chemistry and Engineering
Volume7
Issue number8
DOIs
StatePublished - Apr 15 2019

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment

Keywords

  • Desalination
  • Flow-electrode capacitive deionization
  • Nitrogen
  • Nutrients recovery
  • Phosphorus

Fingerprint Dive into the research topics of 'Concurrent Nitrogen and Phosphorus Recovery Using Flow-Electrode Capacitive Deionization'. Together they form a unique fingerprint.

  • Cite this