Effect of reverse sodium flux and pH on ammoniacal nitrogen transport through biomimetic membranes

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Abstract

Forward osmosis can be used to treat wastewater using seawater as the draw solution. This has been done for both water purification and nutrient concentration. However, the loss of ammoniacal nitrogen to the draw solution may be a key issue, reducing nutrient recovery and preventing the discharge of untreated seawater draw solution – a cost-saving strategy for the industrialisation of forward osmosis for wastewater treatment. In this study, forward ammoniacal nitrogen flux was studied using digester centrate from a wastewater treatment plant as the feed solution. The draw solution contained various NaCl concentrations in order to determine the effect of reverse sodium flux on forward ammoniacal nitrogen flux. The forward ammoniacal nitrogen flux was measured to be 1.5 × 10 –6 –8.0 × 10 –5 mol m −2 s −1 , and increased with pH and sodium concentration in the draw solution. The forward ammonium flux increased with draw solution reverse salt flux below pH = 9, whereas it was unaffected by this flux above pH = 9. Therefore, the reverse flux of sodium ions facilitates the forward transport of ammonium ions at low pH. The transport of the positively charged ammonium was lower than that of the neutral ammonia due to its higher hydrodynamic radius.

Original languageEnglish
JournalSeparation and Purification Technology
Volume217
Pages (from-to)40-47
Number of pages8
ISSN1383-5866
DOIs
Publication statusPublished - 15 Jun 2019

Fingerprint

Biomimetics
Nitrogen
Sodium
Fluxes
Membranes
Ammonium Compounds
Osmosis
Seawater
Wastewater treatment
Nutrients
Ions
Ammonia
Discharge (fluid mechanics)
Purification
Wastewater
Hydrodynamics
Salts
Recovery
Water

Keywords

  • Ammonia
  • Ammonium
  • Aquaporin
  • Biomimetic membrane
  • Forward osmosis

Cite this

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title = "Effect of reverse sodium flux and pH on ammoniacal nitrogen transport through biomimetic membranes",
abstract = "Forward osmosis can be used to treat wastewater using seawater as the draw solution. This has been done for both water purification and nutrient concentration. However, the loss of ammoniacal nitrogen to the draw solution may be a key issue, reducing nutrient recovery and preventing the discharge of untreated seawater draw solution – a cost-saving strategy for the industrialisation of forward osmosis for wastewater treatment. In this study, forward ammoniacal nitrogen flux was studied using digester centrate from a wastewater treatment plant as the feed solution. The draw solution contained various NaCl concentrations in order to determine the effect of reverse sodium flux on forward ammoniacal nitrogen flux. The forward ammoniacal nitrogen flux was measured to be 1.5 × 10 –6 –8.0 × 10 –5 mol m −2 s −1 , and increased with pH and sodium concentration in the draw solution. The forward ammonium flux increased with draw solution reverse salt flux below pH = 9, whereas it was unaffected by this flux above pH = 9. Therefore, the reverse flux of sodium ions facilitates the forward transport of ammonium ions at low pH. The transport of the positively charged ammonium was lower than that of the neutral ammonia due to its higher hydrodynamic radius.",
keywords = "Ammonia, Ammonium, Aquaporin, Biomimetic membrane, Forward osmosis",
author = "Kedwell, {Katie Charlotte} and Christensen, {Morten Lykkegaard} and Quist-Jensen, {Cejna Anna} and J{\o}rgensen, {Mads Koustrup}",
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AU - Kedwell, Katie Charlotte

AU - Christensen, Morten Lykkegaard

AU - Quist-Jensen, Cejna Anna

AU - Jørgensen, Mads Koustrup

PY - 2019/6/15

Y1 - 2019/6/15

N2 - Forward osmosis can be used to treat wastewater using seawater as the draw solution. This has been done for both water purification and nutrient concentration. However, the loss of ammoniacal nitrogen to the draw solution may be a key issue, reducing nutrient recovery and preventing the discharge of untreated seawater draw solution – a cost-saving strategy for the industrialisation of forward osmosis for wastewater treatment. In this study, forward ammoniacal nitrogen flux was studied using digester centrate from a wastewater treatment plant as the feed solution. The draw solution contained various NaCl concentrations in order to determine the effect of reverse sodium flux on forward ammoniacal nitrogen flux. The forward ammoniacal nitrogen flux was measured to be 1.5 × 10 –6 –8.0 × 10 –5 mol m −2 s −1 , and increased with pH and sodium concentration in the draw solution. The forward ammonium flux increased with draw solution reverse salt flux below pH = 9, whereas it was unaffected by this flux above pH = 9. Therefore, the reverse flux of sodium ions facilitates the forward transport of ammonium ions at low pH. The transport of the positively charged ammonium was lower than that of the neutral ammonia due to its higher hydrodynamic radius.

AB - Forward osmosis can be used to treat wastewater using seawater as the draw solution. This has been done for both water purification and nutrient concentration. However, the loss of ammoniacal nitrogen to the draw solution may be a key issue, reducing nutrient recovery and preventing the discharge of untreated seawater draw solution – a cost-saving strategy for the industrialisation of forward osmosis for wastewater treatment. In this study, forward ammoniacal nitrogen flux was studied using digester centrate from a wastewater treatment plant as the feed solution. The draw solution contained various NaCl concentrations in order to determine the effect of reverse sodium flux on forward ammoniacal nitrogen flux. The forward ammoniacal nitrogen flux was measured to be 1.5 × 10 –6 –8.0 × 10 –5 mol m −2 s −1 , and increased with pH and sodium concentration in the draw solution. The forward ammonium flux increased with draw solution reverse salt flux below pH = 9, whereas it was unaffected by this flux above pH = 9. Therefore, the reverse flux of sodium ions facilitates the forward transport of ammonium ions at low pH. The transport of the positively charged ammonium was lower than that of the neutral ammonia due to its higher hydrodynamic radius.

KW - Ammonia

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KW - Aquaporin

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