Ammonium removal from domestic wastewater using selective battery electrodes

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Conventional technologies for ammonium removal from wastewaters are based on biological conversion to nitrogen gas, eliminating the possibility for ammonium recovery. A new electrochemical approach was developed here to selectively remove ammonium using two copper hexacyanoferrate (CuHCF) battery electrodes separated by an anion exchange membrane, at low applied voltages (0.1 to 0.3 V). The CuHCF battery electrodes removed NH4 + from a synthetic wastewater with a selectivity >5 (i.e., percent removed of NH4 +/percent removed of Na+) when operated with a 0.1 V applied voltage, despite the much higher initial Na+ concentration in the sample (20 mM) than NH4 + (5 mM). In contrast, we observed only negligible selective removal of NH4 + over Na+ (<2) when using nonselective electrodes or ion-selective membranes (10 mM Na+, 5 mM NH4 +, 0.1 V). The selectivity further increased to 9 when using equimolar concentrations of NH4 + and Na+ (10 mM). With an actual domestic wastewater, the CuHCF electrodes removed 85% of NH4 + (3.4 to 0.5 mM) with a selectivity >4 versus Na+ in the presence of other competing cations. These results demonstrate that CuHCF electrodes can be used to selectively remove NH4 + from various waters containing multiple ions.

Original languageEnglish (US)
Pages (from-to)578-583
Number of pages6
JournalEnvironmental Science and Technology Letters
Volume5
Issue number9
DOIs
StatePublished - Jan 1 2018

Fingerprint

Waste Water
Ammonium Compounds
Electrodes
electrode
Wastewater
ammonium
wastewater
Electric potential
Anions
Cations
Copper
ion exchange
Ion exchange
Nitrogen
Negative ions
cation
Gases
Positive ions
Ions
membrane

All Science Journal Classification (ASJC) codes

  • Ecology
  • Environmental Chemistry
  • Health, Toxicology and Mutagenesis
  • Pollution
  • Waste Management and Disposal
  • Water Science and Technology

Cite this

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title = "Ammonium removal from domestic wastewater using selective battery electrodes",
abstract = "Conventional technologies for ammonium removal from wastewaters are based on biological conversion to nitrogen gas, eliminating the possibility for ammonium recovery. A new electrochemical approach was developed here to selectively remove ammonium using two copper hexacyanoferrate (CuHCF) battery electrodes separated by an anion exchange membrane, at low applied voltages (0.1 to 0.3 V). The CuHCF battery electrodes removed NH4 + from a synthetic wastewater with a selectivity >5 (i.e., percent removed of NH4 +/percent removed of Na+) when operated with a 0.1 V applied voltage, despite the much higher initial Na+ concentration in the sample (20 mM) than NH4 + (5 mM). In contrast, we observed only negligible selective removal of NH4 + over Na+ (<2) when using nonselective electrodes or ion-selective membranes (10 mM Na+, 5 mM NH4 +, 0.1 V). The selectivity further increased to 9 when using equimolar concentrations of NH4 + and Na+ (10 mM). With an actual domestic wastewater, the CuHCF electrodes removed 85{\%} of NH4 + (3.4 to 0.5 mM) with a selectivity >4 versus Na+ in the presence of other competing cations. These results demonstrate that CuHCF electrodes can be used to selectively remove NH4 + from various waters containing multiple ions.",
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Ammonium removal from domestic wastewater using selective battery electrodes. / Kim, Taeyoung; Gorski, Christopher Aaron; Logan, Bruce Ernest.

In: Environmental Science and Technology Letters, Vol. 5, No. 9, 01.01.2018, p. 578-583.

Research output: Contribution to journalArticle

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AU - Kim, Taeyoung

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AU - Logan, Bruce Ernest

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AB - Conventional technologies for ammonium removal from wastewaters are based on biological conversion to nitrogen gas, eliminating the possibility for ammonium recovery. A new electrochemical approach was developed here to selectively remove ammonium using two copper hexacyanoferrate (CuHCF) battery electrodes separated by an anion exchange membrane, at low applied voltages (0.1 to 0.3 V). The CuHCF battery electrodes removed NH4 + from a synthetic wastewater with a selectivity >5 (i.e., percent removed of NH4 +/percent removed of Na+) when operated with a 0.1 V applied voltage, despite the much higher initial Na+ concentration in the sample (20 mM) than NH4 + (5 mM). In contrast, we observed only negligible selective removal of NH4 + over Na+ (<2) when using nonselective electrodes or ion-selective membranes (10 mM Na+, 5 mM NH4 +, 0.1 V). The selectivity further increased to 9 when using equimolar concentrations of NH4 + and Na+ (10 mM). With an actual domestic wastewater, the CuHCF electrodes removed 85% of NH4 + (3.4 to 0.5 mM) with a selectivity >4 versus Na+ in the presence of other competing cations. These results demonstrate that CuHCF electrodes can be used to selectively remove NH4 + from various waters containing multiple ions.

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