Phosphate removal by iron oxide-coated diatomite: Laboratory test of a new method for cleaning drainage water

Gry Lyngsie*, Konstantina Katika, Ida Lykke Fabricius, Hans Christian Bruun Hansen, Ole Kragholm Borggaard

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Transport of phosphate (P) in drainage water from P rich agricultural fields to freshwaters via drains may cause open water eutrophication. One way to reduce this transport is by installation of P sorbing filters at drain outlets. As drainage water flows and P concentrations can be highly fluctuating, suitable filter must have good hydraulic conductivity and high P sorbing efficiency, i.e. rapid sorption with high affinity and capacity. To fulfill these requirements, we tested a new concept for filter material design comprising porous and stable calcined diatomaceous earth particles (CDE, 2e4 mm) coated with thin layers of high affinity P sorbing amorphous iron oxide. According to NMR and MICP analyses the material had a bimodal pore size distribution with average diameters of around 1 μm and 100 μm. The coating formed a thin film on the CDE internal and external surfaces and markedly increased the P sorption efficiency. Thus, P in 0.1 and 0.5 mg P/L solutions was almost quantitatively sorbed within 1½ min at a solution:solid ratio of 100. SEM-EDX demonstrated that P quickly penetrated into the porous structure of the CDE granules and that all Fe in the coating was active in P bonding. This conceptual investigation demonstrates that porous CDE is a useful host into which Fe oxides can be precipitated resulting in an effective P sorbing material.
Original languageEnglish
JournalChemosphere
Volume222
Pages (from-to)884-890
ISSN0045-6535
DOIs
Publication statusPublished - 2019

Cite this

Lyngsie, Gry ; Katika, Konstantina ; Fabricius, Ida Lykke ; Hansen, Hans Christian Bruun ; Borggaard, Ole Kragholm. / Phosphate removal by iron oxide-coated diatomite: Laboratory test of a new method for cleaning drainage water. In: Chemosphere. 2019 ; Vol. 222. pp. 884-890.
@article{0a55b0b5bbd74dedb0bb807eeffcebab,
title = "Phosphate removal by iron oxide-coated diatomite: Laboratory test of a new method for cleaning drainage water",
abstract = "Transport of phosphate (P) in drainage water from P rich agricultural fields to freshwaters via drains may cause open water eutrophication. One way to reduce this transport is by installation of P sorbing filters at drain outlets. As drainage water flows and P concentrations can be highly fluctuating, suitable filter must have good hydraulic conductivity and high P sorbing efficiency, i.e. rapid sorption with high affinity and capacity. To fulfill these requirements, we tested a new concept for filter material design comprising porous and stable calcined diatomaceous earth particles (CDE, 2e4 mm) coated with thin layers of high affinity P sorbing amorphous iron oxide. According to NMR and MICP analyses the material had a bimodal pore size distribution with average diameters of around 1 μm and 100 μm. The coating formed a thin film on the CDE internal and external surfaces and markedly increased the P sorption efficiency. Thus, P in 0.1 and 0.5 mg P/L solutions was almost quantitatively sorbed within 1½ min at a solution:solid ratio of 100. SEM-EDX demonstrated that P quickly penetrated into the porous structure of the CDE granules and that all Fe in the coating was active in P bonding. This conceptual investigation demonstrates that porous CDE is a useful host into which Fe oxides can be precipitated resulting in an effective P sorbing material.",
author = "Gry Lyngsie and Konstantina Katika and Fabricius, {Ida Lykke} and Hansen, {Hans Christian Bruun} and Borggaard, {Ole Kragholm}",
year = "2019",
doi = "10.1016/j.chemosphere.2019.01.158",
language = "English",
volume = "222",
pages = "884--890",
journal = "Chemosphere",
issn = "0045-6535",
publisher = "Pergamon Press",

}

Phosphate removal by iron oxide-coated diatomite: Laboratory test of a new method for cleaning drainage water. / Lyngsie, Gry; Katika, Konstantina; Fabricius, Ida Lykke; Hansen, Hans Christian Bruun; Borggaard, Ole Kragholm.

In: Chemosphere, Vol. 222, 2019, p. 884-890.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Phosphate removal by iron oxide-coated diatomite: Laboratory test of a new method for cleaning drainage water

AU - Lyngsie, Gry

AU - Katika, Konstantina

AU - Fabricius, Ida Lykke

AU - Hansen, Hans Christian Bruun

AU - Borggaard, Ole Kragholm

PY - 2019

Y1 - 2019

N2 - Transport of phosphate (P) in drainage water from P rich agricultural fields to freshwaters via drains may cause open water eutrophication. One way to reduce this transport is by installation of P sorbing filters at drain outlets. As drainage water flows and P concentrations can be highly fluctuating, suitable filter must have good hydraulic conductivity and high P sorbing efficiency, i.e. rapid sorption with high affinity and capacity. To fulfill these requirements, we tested a new concept for filter material design comprising porous and stable calcined diatomaceous earth particles (CDE, 2e4 mm) coated with thin layers of high affinity P sorbing amorphous iron oxide. According to NMR and MICP analyses the material had a bimodal pore size distribution with average diameters of around 1 μm and 100 μm. The coating formed a thin film on the CDE internal and external surfaces and markedly increased the P sorption efficiency. Thus, P in 0.1 and 0.5 mg P/L solutions was almost quantitatively sorbed within 1½ min at a solution:solid ratio of 100. SEM-EDX demonstrated that P quickly penetrated into the porous structure of the CDE granules and that all Fe in the coating was active in P bonding. This conceptual investigation demonstrates that porous CDE is a useful host into which Fe oxides can be precipitated resulting in an effective P sorbing material.

AB - Transport of phosphate (P) in drainage water from P rich agricultural fields to freshwaters via drains may cause open water eutrophication. One way to reduce this transport is by installation of P sorbing filters at drain outlets. As drainage water flows and P concentrations can be highly fluctuating, suitable filter must have good hydraulic conductivity and high P sorbing efficiency, i.e. rapid sorption with high affinity and capacity. To fulfill these requirements, we tested a new concept for filter material design comprising porous and stable calcined diatomaceous earth particles (CDE, 2e4 mm) coated with thin layers of high affinity P sorbing amorphous iron oxide. According to NMR and MICP analyses the material had a bimodal pore size distribution with average diameters of around 1 μm and 100 μm. The coating formed a thin film on the CDE internal and external surfaces and markedly increased the P sorption efficiency. Thus, P in 0.1 and 0.5 mg P/L solutions was almost quantitatively sorbed within 1½ min at a solution:solid ratio of 100. SEM-EDX demonstrated that P quickly penetrated into the porous structure of the CDE granules and that all Fe in the coating was active in P bonding. This conceptual investigation demonstrates that porous CDE is a useful host into which Fe oxides can be precipitated resulting in an effective P sorbing material.

U2 - 10.1016/j.chemosphere.2019.01.158

DO - 10.1016/j.chemosphere.2019.01.158

M3 - Journal article

VL - 222

SP - 884

EP - 890

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

ER -