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@article{1d0bede44e0f4b3992f27a051a39fc92,
title = "Application of dynamic current density for increased concentration factors and reduced energy consumption for concentrating ammonium by electrodialysis",
abstract = "Ammonium (NH4+) can be recovered from water for fertiliser production or even energy production purposes. Because NH4+ recovery is more effective at increased concentrations, electrodialysis (ED) can be used to concentrate NH4+ from side streams, such as sludge reject water, and simultaneously achieve high NH4+ removal efficiencies. However, the effect of osmosis and back-diffusion increases when the NH4+ concentration gradient between the diluate and the concentrate stream increases, resulting in a limitation of the concentration factor and an increase in energy consumption for NH4+ removal. In this study, we showed that operation at dynamic current density (DCD) reduced the effect of osmosis and back-diffusion, due to a 75{\%} decrease of the operational run time, compared to operation at a fixed current density (FCD). The concentration factor increased from 4.5 for an FCD to 6.7 for DCD, while the energy consumption of 90{\%} NH4+ removal from synthetic sludge reject water at DCD remained stable at 5.4 MJ·kg-N−1.",
keywords = "Ammonium, Back-diffusion, Current efficiency, Electro-osmosis, Electrodialysis, Osmosis",
author = "{van Linden}, N. and H. Spanjers and {van Lier}, {Jules B.}",
year = "2019",
doi = "10.1016/j.watres.2019.114856",
language = "English",
volume = "163",
journal = "Water Research",
issn = "0043-1354",
publisher = "Elsevier",

}

RIS

TY - JOUR

T1 - Application of dynamic current density for increased concentration factors and reduced energy consumption for concentrating ammonium by electrodialysis

AU - van Linden, N.

AU - Spanjers, H.

AU - van Lier, Jules B.

PY - 2019

Y1 - 2019

N2 - Ammonium (NH4+) can be recovered from water for fertiliser production or even energy production purposes. Because NH4+ recovery is more effective at increased concentrations, electrodialysis (ED) can be used to concentrate NH4+ from side streams, such as sludge reject water, and simultaneously achieve high NH4+ removal efficiencies. However, the effect of osmosis and back-diffusion increases when the NH4+ concentration gradient between the diluate and the concentrate stream increases, resulting in a limitation of the concentration factor and an increase in energy consumption for NH4+ removal. In this study, we showed that operation at dynamic current density (DCD) reduced the effect of osmosis and back-diffusion, due to a 75% decrease of the operational run time, compared to operation at a fixed current density (FCD). The concentration factor increased from 4.5 for an FCD to 6.7 for DCD, while the energy consumption of 90% NH4+ removal from synthetic sludge reject water at DCD remained stable at 5.4 MJ·kg-N−1.

AB - Ammonium (NH4+) can be recovered from water for fertiliser production or even energy production purposes. Because NH4+ recovery is more effective at increased concentrations, electrodialysis (ED) can be used to concentrate NH4+ from side streams, such as sludge reject water, and simultaneously achieve high NH4+ removal efficiencies. However, the effect of osmosis and back-diffusion increases when the NH4+ concentration gradient between the diluate and the concentrate stream increases, resulting in a limitation of the concentration factor and an increase in energy consumption for NH4+ removal. In this study, we showed that operation at dynamic current density (DCD) reduced the effect of osmosis and back-diffusion, due to a 75% decrease of the operational run time, compared to operation at a fixed current density (FCD). The concentration factor increased from 4.5 for an FCD to 6.7 for DCD, while the energy consumption of 90% NH4+ removal from synthetic sludge reject water at DCD remained stable at 5.4 MJ·kg-N−1.

KW - Ammonium

KW - Back-diffusion

KW - Current efficiency

KW - Electro-osmosis

KW - Electrodialysis

KW - Osmosis

UR - http://www.scopus.com/inward/record.url?scp=85069549613&partnerID=8YFLogxK

U2 - 10.1016/j.watres.2019.114856

DO - 10.1016/j.watres.2019.114856

M3 - Article

VL - 163

JO - Water Research

T2 - Water Research

JF - Water Research

SN - 0043-1354

M1 - 114856

ER -

ID: 55588155