Abstract
This study investigated membrane capacitive deionization (MCDI) at a pilot-scale using ion-selective polymer-coated carbon electrodes for wastewater reuse. Several issues have been addressed to verify the suitability of MCDI for wastewater reclamation: electrosorption performance, removal efficiency and selectivity of ions present in wastewater, optimization of operating conditions, and performance degradation in long-term caused by the accumulation of organic contaminants. The coated electrodes had better adsorption capacities and charge efficiencies than the conventional MCDI system, which was attributed to their low electrical resistance induced by the thin coated layer. The pilot-scale MCDI test cell involved 50 pairs of anion- and cation-selective electrodes and achieved good removal efficiency of ions from the wastewater effluent, particularly for problematic charged impurities, such as nitrate (NO 3 − ) (up to 91.08% of NO 3 − was removed). Increasing the flow rate and reducing the applied potential were shown to be efficient for achieving better water quality by enhancing the NO 3 − selectivity. Last, the 15 d operation showed good reproducibility in electrosorption and regeneration for the coated electrodes, despite the fact that high concentrations of organics were contained in the wastewater feed solution (12.4 mg/L of dissolved organic carbon).
| Original language | English |
|---|---|
| Pages (from-to) | 241-250 |
| Number of pages | 10 |
| Journal | Chemical Engineering Journal |
| DOIs | |
| Publication status | Published - 2019 Sep 15 |
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Keywords
- Ion selectivity
- Ion-selective carbon electrode
- Membrane capacitive deionization
- Nitrate removal
- Wastewater reuse
ASJC Scopus subject areas
- Chemistry(all)
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering
Cite this
Reuse of municipal wastewater via membrane capacitive deionization using ion-selective polymer-coated carbon electrodes in pilot-scale. / Kim, David Inhyuk; Dorji, Pema; Gwak, Gimun; Phuntsho, Sherub; Hong, Seungkwan; Shon, Hokyong.
In: Chemical Engineering Journal, 15.09.2019, p. 241-250.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Reuse of municipal wastewater via membrane capacitive deionization using ion-selective polymer-coated carbon electrodes in pilot-scale
AU - Kim, David Inhyuk
AU - Dorji, Pema
AU - Gwak, Gimun
AU - Phuntsho, Sherub
AU - Hong, Seungkwan
AU - Shon, Hokyong
PY - 2019/9/15
Y1 - 2019/9/15
N2 - This study investigated membrane capacitive deionization (MCDI) at a pilot-scale using ion-selective polymer-coated carbon electrodes for wastewater reuse. Several issues have been addressed to verify the suitability of MCDI for wastewater reclamation: electrosorption performance, removal efficiency and selectivity of ions present in wastewater, optimization of operating conditions, and performance degradation in long-term caused by the accumulation of organic contaminants. The coated electrodes had better adsorption capacities and charge efficiencies than the conventional MCDI system, which was attributed to their low electrical resistance induced by the thin coated layer. The pilot-scale MCDI test cell involved 50 pairs of anion- and cation-selective electrodes and achieved good removal efficiency of ions from the wastewater effluent, particularly for problematic charged impurities, such as nitrate (NO 3 − ) (up to 91.08% of NO 3 − was removed). Increasing the flow rate and reducing the applied potential were shown to be efficient for achieving better water quality by enhancing the NO 3 − selectivity. Last, the 15 d operation showed good reproducibility in electrosorption and regeneration for the coated electrodes, despite the fact that high concentrations of organics were contained in the wastewater feed solution (12.4 mg/L of dissolved organic carbon).
AB - This study investigated membrane capacitive deionization (MCDI) at a pilot-scale using ion-selective polymer-coated carbon electrodes for wastewater reuse. Several issues have been addressed to verify the suitability of MCDI for wastewater reclamation: electrosorption performance, removal efficiency and selectivity of ions present in wastewater, optimization of operating conditions, and performance degradation in long-term caused by the accumulation of organic contaminants. The coated electrodes had better adsorption capacities and charge efficiencies than the conventional MCDI system, which was attributed to their low electrical resistance induced by the thin coated layer. The pilot-scale MCDI test cell involved 50 pairs of anion- and cation-selective electrodes and achieved good removal efficiency of ions from the wastewater effluent, particularly for problematic charged impurities, such as nitrate (NO 3 − ) (up to 91.08% of NO 3 − was removed). Increasing the flow rate and reducing the applied potential were shown to be efficient for achieving better water quality by enhancing the NO 3 − selectivity. Last, the 15 d operation showed good reproducibility in electrosorption and regeneration for the coated electrodes, despite the fact that high concentrations of organics were contained in the wastewater feed solution (12.4 mg/L of dissolved organic carbon).
KW - Ion selectivity
KW - Ion-selective carbon electrode
KW - Membrane capacitive deionization
KW - Nitrate removal
KW - Wastewater reuse
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UR - http://www.scopus.com/inward/citedby.url?scp=85064619943&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2019.04.156
DO - 10.1016/j.cej.2019.04.156
M3 - Article
SP - 241
EP - 250
JO - Chemical Engineering Journal
JF - Chemical Engineering Journal
SN - 1385-8947
ER -