Pretreatment for capacitive deionization: Feasibility tests using activated filter media and granule activated carbon filtration

Heegon Kim, Yeseul Choi, Soonjae Lee, Ki Bong Lee, Kyung Won Jung, Jae Woo Choi

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Dissolved organic matter and scaling are the main causes of electrode fouling, blocking activated carbon pores and reducing their performance. However, limited information exists on fouling by low molecular weight organic matter in the capacitive deionization (CDI) process. This study therefore systematically investigated for the first time a pretreatment process to prevent the accumulation of organic and inorganic matter as well as scaling in the CDI process. During various pretreatments, activated filter media and granule activated carbon were considered promising for drinking water treatment. The higher the turbidity and organic matter concentration in the CDI feed solution was, the greater the reduction of salt removal efficiency, production rate, and energy consumption became. Divalent ions, such as Ca2+, had no noticeable effect on CDI treatment performance because of the neutralization effect of the dispersant, whereas iron had a noticeable effect on CDI electrode fouling. The results of this study are foreseen to help minimize its negative impact by reducing organic matter fouling and enabling water reuse.

Original languageEnglish
Pages (from-to)253-258
Number of pages6
JournalJournal of Industrial and Engineering Chemistry
Volume93
DOIs
Publication statusPublished - 2021 Jan 25

Keywords

  • Activated filter media
  • Capacitive deionization
  • Liquid chromatography with organic carbon detection
  • Municipal wastewater

ASJC Scopus subject areas

  • Chemical Engineering(all)

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