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

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

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.

OriginalsprogEngelsk
TidsskriftSeparation and Purification Technology
Vol/bind217
Sider (fra-til)40-47
Antal sider8
ISSN1383-5866
DOI
StatusUdgivet - 15 jun. 2019

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

Citer dette

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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.",
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Effect of reverse sodium flux and pH on ammoniacal nitrogen transport through biomimetic membranes. / Kedwell, Katie Charlotte; Christensen, Morten Lykkegaard; Quist-Jensen, Cejna Anna; Jørgensen, Mads Koustrup.

I: Separation and Purification Technology, Bind 217, 15.06.2019, s. 40-47.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

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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.

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