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Phosphate sorption by three potential filter materials as assessed by isothermal titration calorimetry

Lyngsie, Gry LU ; Penn, Chad J. ; Hansen, Hans C B and Borggaard, Ole K. (2014) In Journal of Environmental Management 143. p.26-33
Abstract

Phosphorus eutrophication of lakes and streams, coming from drained farmlands, is a serious problem in areas with intensive agriculture. Installation of phosphate (P) sorbing filters at drain outlets may be a solution. The aim of this study was to improve the understanding of reactions involved in P sorption by three commercial P sorbing materials, i.e. Ca/Mg oxide-based Filtralite-P, Fe oxide-based CFH-12 and Limestone in two particle sizes (2-1mm and 1-0.5mm), by means of isothermal titration calorimetry (ITC), sorption isotherms, sequential extractions and SEM-EDS. The results indicate that P retention by CFH is due to surface complexation by rapid formation of strong Fe-P bonds. In contrast, retention of P by Filtralite-P and... (More)

Phosphorus eutrophication of lakes and streams, coming from drained farmlands, is a serious problem in areas with intensive agriculture. Installation of phosphate (P) sorbing filters at drain outlets may be a solution. The aim of this study was to improve the understanding of reactions involved in P sorption by three commercial P sorbing materials, i.e. Ca/Mg oxide-based Filtralite-P, Fe oxide-based CFH-12 and Limestone in two particle sizes (2-1mm and 1-0.5mm), by means of isothermal titration calorimetry (ITC), sorption isotherms, sequential extractions and SEM-EDS. The results indicate that P retention by CFH is due to surface complexation by rapid formation of strong Fe-P bonds. In contrast, retention of P by Filtralite-P and Limestone strongly depends on pH and time and is interpreted due to formation of calcium phosphate precipitate(s). Consequently, CFH can unambiguously be recommended as P retention filter material in drain outlets, whereas the use of Filtralite-P and Limestone has certain (serious) limitations. Thus, Filtralite-P has high capacity to retain P but only at alkaline pH (pH≥10) and P retention by Limestone requires long-time contact and a high ratio between sorbent and sorbate.

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author
; ; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Calcium phosphates, CFH-12, Fe-oxides, Filtralite-P, Limestone, P sorbing reactions
in
Journal of Environmental Management
volume
143
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:84900018296
  • pmid:24833525
ISSN
0301-4797
DOI
10.1016/j.jenvman.2014.04.010
language
English
LU publication?
no
id
1688a438-6230-4256-a7be-5654e15e26c5
date added to LUP
2016-10-17 14:08:11
date last changed
2023-02-16 05:27:43
@article{1688a438-6230-4256-a7be-5654e15e26c5,
  abstract     = {{<p>Phosphorus eutrophication of lakes and streams, coming from drained farmlands, is a serious problem in areas with intensive agriculture. Installation of phosphate (P) sorbing filters at drain outlets may be a solution. The aim of this study was to improve the understanding of reactions involved in P sorption by three commercial P sorbing materials, i.e. Ca/Mg oxide-based Filtralite-P, Fe oxide-based CFH-12 and Limestone in two particle sizes (2-1mm and 1-0.5mm), by means of isothermal titration calorimetry (ITC), sorption isotherms, sequential extractions and SEM-EDS. The results indicate that P retention by CFH is due to surface complexation by rapid formation of strong Fe-P bonds. In contrast, retention of P by Filtralite-P and Limestone strongly depends on pH and time and is interpreted due to formation of calcium phosphate precipitate(s). Consequently, CFH can unambiguously be recommended as P retention filter material in drain outlets, whereas the use of Filtralite-P and Limestone has certain (serious) limitations. Thus, Filtralite-P has high capacity to retain P but only at alkaline pH (pH≥10) and P retention by Limestone requires long-time contact and a high ratio between sorbent and sorbate.</p>}},
  author       = {{Lyngsie, Gry and Penn, Chad J. and Hansen, Hans C B and Borggaard, Ole K.}},
  issn         = {{0301-4797}},
  keywords     = {{Calcium phosphates; CFH-12; Fe-oxides; Filtralite-P; Limestone; P sorbing reactions}},
  language     = {{eng}},
  month        = {{10}},
  pages        = {{26--33}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Environmental Management}},
  title        = {{Phosphate sorption by three potential filter materials as assessed by isothermal titration calorimetry}},
  url          = {{http://dx.doi.org/10.1016/j.jenvman.2014.04.010}},
  doi          = {{10.1016/j.jenvman.2014.04.010}},
  volume       = {{143}},
  year         = {{2014}},
}