Evaluation of dried amorphous ferric hydroxide CFH-12® as agent for binding bioavailable phosphorus in lake sediments

Elisabeth Fuchs, Ana Funes, Katrin Saar, Kasper Reitzel, Henning S Jensen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Metal hydroxides formed from aluminum (Al) and iron (Fe) salts can be used as phosphorus (P) adsorbents in lake restoration, but the application entails problems in low-alkaline lakes due to acid producing hydrolysis and potential formation of toxic metal ions. Therefore, we tested the potential of applying CFH-12® (Kemira) - a dried, amorphous Fe-oxide with no pH effect - in lake restoration. Since Fe3+ may become reduced in lake sediments and release both Fe2+ and any associated P we also evaluated the redox sensitivity of CFH-12® in comparison with freshly formed Fe(OH)3. CFH-12® was added to undisturbed sediment cores from three Danish lakes relative to the size of their mobile P pool (molar Fe:PMobile dose ratio of ~10:1), and P and Fe fluxes across the sediment-water interface were compared with those from untreated cores and cores treated with freshly formed Fe(OH)3. Under anoxic conditions, we found that CFH-12® significantly reduced the P efflux from the sediments (by 43% in Lake Sønderby, 70% in Lake Hampen and 60% in Lake Hostrup) while the Fe2+ efflux remained unchanged relative to the untreated cores. Cores treated with freshly formed Fe(OH)3 retained more P, but released significantly more Fe2+, indicating continued Fe3+ reduction. Finally, experiments with pure phases showed that CFH-12® adsorbed less P than freshly formed Fe(OH)3 in the short term, but was capable of adsorbing up to 70% of P adsorbed by Fe(OH)3 over 3months. With product costs only 30% higher than Al salts we find that CFH-12® has potential for use in restoration of low-alkaline lakes.

OriginalsprogEngelsk
TidsskriftScience of the Total Environment
Vol/bind628-629
Sider (fra-til)990-996
ISSN0048-9697
DOI
StatusUdgivet - 2018

Fingeraftryk

Phosphorus
hydroxide
Lakes
lacustrine deposit
Sediments
phosphorus
lake
Restoration
Aluminum
aluminum
Salts
salt
Hydroxides
pH effects
ferric hydroxide
evaluation
sediment-water interface
Poisons
anoxic conditions
sediment core

Citer dette

@article{32d3471c097d42a9b4294e33a61ebdc9,
title = "Evaluation of dried amorphous ferric hydroxide CFH-12{\circledR} as agent for binding bioavailable phosphorus in lake sediments",
abstract = "Metal hydroxides formed from aluminum (Al) and iron (Fe) salts can be used as phosphorus (P) adsorbents in lake restoration, but the application entails problems in low-alkaline lakes due to acid producing hydrolysis and potential formation of toxic metal ions. Therefore, we tested the potential of applying CFH-12{\circledR} (Kemira) - a dried, amorphous Fe-oxide with no pH effect - in lake restoration. Since Fe3+ may become reduced in lake sediments and release both Fe2+ and any associated P we also evaluated the redox sensitivity of CFH-12{\circledR} in comparison with freshly formed Fe(OH)3. CFH-12{\circledR} was added to undisturbed sediment cores from three Danish lakes relative to the size of their mobile P pool (molar Fe:PMobile dose ratio of ~10:1), and P and Fe fluxes across the sediment-water interface were compared with those from untreated cores and cores treated with freshly formed Fe(OH)3. Under anoxic conditions, we found that CFH-12{\circledR} significantly reduced the P efflux from the sediments (by 43{\%} in Lake S{\o}nderby, 70{\%} in Lake Hampen and 60{\%} in Lake Hostrup) while the Fe2+ efflux remained unchanged relative to the untreated cores. Cores treated with freshly formed Fe(OH)3 retained more P, but released significantly more Fe2+, indicating continued Fe3+ reduction. Finally, experiments with pure phases showed that CFH-12{\circledR} adsorbed less P than freshly formed Fe(OH)3 in the short term, but was capable of adsorbing up to 70{\%} of P adsorbed by Fe(OH)3 over 3months. With product costs only 30{\%} higher than Al salts we find that CFH-12{\circledR} has potential for use in restoration of low-alkaline lakes.",
author = "Elisabeth Fuchs and Ana Funes and Katrin Saar and Kasper Reitzel and Jensen, {Henning S}",
note = "Copyright {\circledC} 2018 Elsevier B.V. All rights reserved.",
year = "2018",
doi = "10.1016/j.scitotenv.2018.02.059",
language = "English",
volume = "628-629",
pages = "990--996",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

Evaluation of dried amorphous ferric hydroxide CFH-12® as agent for binding bioavailable phosphorus in lake sediments. / Fuchs, Elisabeth; Funes, Ana; Saar, Katrin; Reitzel, Kasper; Jensen, Henning S.

I: Science of the Total Environment, Bind 628-629, 2018, s. 990-996.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Evaluation of dried amorphous ferric hydroxide CFH-12® as agent for binding bioavailable phosphorus in lake sediments

AU - Fuchs, Elisabeth

AU - Funes, Ana

AU - Saar, Katrin

AU - Reitzel, Kasper

AU - Jensen, Henning S

N1 - Copyright © 2018 Elsevier B.V. All rights reserved.

PY - 2018

Y1 - 2018

N2 - Metal hydroxides formed from aluminum (Al) and iron (Fe) salts can be used as phosphorus (P) adsorbents in lake restoration, but the application entails problems in low-alkaline lakes due to acid producing hydrolysis and potential formation of toxic metal ions. Therefore, we tested the potential of applying CFH-12® (Kemira) - a dried, amorphous Fe-oxide with no pH effect - in lake restoration. Since Fe3+ may become reduced in lake sediments and release both Fe2+ and any associated P we also evaluated the redox sensitivity of CFH-12® in comparison with freshly formed Fe(OH)3. CFH-12® was added to undisturbed sediment cores from three Danish lakes relative to the size of their mobile P pool (molar Fe:PMobile dose ratio of ~10:1), and P and Fe fluxes across the sediment-water interface were compared with those from untreated cores and cores treated with freshly formed Fe(OH)3. Under anoxic conditions, we found that CFH-12® significantly reduced the P efflux from the sediments (by 43% in Lake Sønderby, 70% in Lake Hampen and 60% in Lake Hostrup) while the Fe2+ efflux remained unchanged relative to the untreated cores. Cores treated with freshly formed Fe(OH)3 retained more P, but released significantly more Fe2+, indicating continued Fe3+ reduction. Finally, experiments with pure phases showed that CFH-12® adsorbed less P than freshly formed Fe(OH)3 in the short term, but was capable of adsorbing up to 70% of P adsorbed by Fe(OH)3 over 3months. With product costs only 30% higher than Al salts we find that CFH-12® has potential for use in restoration of low-alkaline lakes.

AB - Metal hydroxides formed from aluminum (Al) and iron (Fe) salts can be used as phosphorus (P) adsorbents in lake restoration, but the application entails problems in low-alkaline lakes due to acid producing hydrolysis and potential formation of toxic metal ions. Therefore, we tested the potential of applying CFH-12® (Kemira) - a dried, amorphous Fe-oxide with no pH effect - in lake restoration. Since Fe3+ may become reduced in lake sediments and release both Fe2+ and any associated P we also evaluated the redox sensitivity of CFH-12® in comparison with freshly formed Fe(OH)3. CFH-12® was added to undisturbed sediment cores from three Danish lakes relative to the size of their mobile P pool (molar Fe:PMobile dose ratio of ~10:1), and P and Fe fluxes across the sediment-water interface were compared with those from untreated cores and cores treated with freshly formed Fe(OH)3. Under anoxic conditions, we found that CFH-12® significantly reduced the P efflux from the sediments (by 43% in Lake Sønderby, 70% in Lake Hampen and 60% in Lake Hostrup) while the Fe2+ efflux remained unchanged relative to the untreated cores. Cores treated with freshly formed Fe(OH)3 retained more P, but released significantly more Fe2+, indicating continued Fe3+ reduction. Finally, experiments with pure phases showed that CFH-12® adsorbed less P than freshly formed Fe(OH)3 in the short term, but was capable of adsorbing up to 70% of P adsorbed by Fe(OH)3 over 3months. With product costs only 30% higher than Al salts we find that CFH-12® has potential for use in restoration of low-alkaline lakes.

U2 - 10.1016/j.scitotenv.2018.02.059

DO - 10.1016/j.scitotenv.2018.02.059

M3 - Journal article

VL - 628-629

SP - 990

EP - 996

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -