Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes

Natural apatites have previously shown a great capacity for phosphate retention from wastewater. However, its fine particle size distribution may lead to a premature clogging of the filter. Accordingly, a granulated apatite product was developed and manufactured in order to control the particle size...

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Autores principales:	Laura Delgado-González, Bruno Lartiges, Mathieu Gautier, Stéphane Troesch, Pascal Molle
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	granulated apatite filter phosphorus retention small wwtps Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/873283fd54954f3f8b8387518f80b318
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spelling	oai:doaj.org-article:873283fd54954f3f8b8387518f80b3182021-11-06T10:47:53ZPhosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes0273-12231996-973210.2166/wst.2021.010https://doaj.org/article/873283fd54954f3f8b8387518f80b3182021-02-01T00:00:00Zhttp://wst.iwaponline.com/content/83/4/792https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Natural apatites have previously shown a great capacity for phosphate retention from wastewater. However, its fine particle size distribution may lead to a premature clogging of the filter. Accordingly, a granulated apatite product was developed and manufactured in order to control the particle size distribution of the media. Experiments were conducted on laboratory columns to assess their phosphorus retention capacity, to identify the processes involved in phosphorus retention and to evaluate their kinetic rates. The results showed phosphorus retention capacities of 10.5 and 12.4 g PO4-P·kg−1 and kinetic rate coefficients in the range of 0.63 and 0.23 h−1 involving lower values than those found for natural apatites in previous studies. Scanning Electron Microscopy images showed that apatite particles in the granules were embedded in the binder and were not readily accessible to act as seeds for calcium phosphate precipitation. The retention processes differ depending on the supersaturation of the solution with respect to calcium phosphate phases: at low calcium concentrations (69.8 ± 3.9 mg·L−1), hydroxyapatite precipitates fill up the porosity of the binder up to a depth of 100–300 μm from the granule surface; at higher calcium concentrations (112.7 ± 7.4 mg·L−1) precipitation occurs at the granule surface, forming successive layers of hydroxyapatite and carbonated calcium phosphates.Laura Delgado-GonzálezBruno LartigesMathieu GautierStéphane TroeschPascal MolleIWA Publishingarticlegranulated apatite filterphosphorus retentionsmall wwtpsEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 83, Iss 4, Pp 792-802 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	granulated apatite filter phosphorus retention small wwtps Environmental technology. Sanitary engineering TD1-1066
spellingShingle	granulated apatite filter phosphorus retention small wwtps Environmental technology. Sanitary engineering TD1-1066 Laura Delgado-González Bruno Lartiges Mathieu Gautier Stéphane Troesch Pascal Molle Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
description	Natural apatites have previously shown a great capacity for phosphate retention from wastewater. However, its fine particle size distribution may lead to a premature clogging of the filter. Accordingly, a granulated apatite product was developed and manufactured in order to control the particle size distribution of the media. Experiments were conducted on laboratory columns to assess their phosphorus retention capacity, to identify the processes involved in phosphorus retention and to evaluate their kinetic rates. The results showed phosphorus retention capacities of 10.5 and 12.4 g PO4-P·kg−1 and kinetic rate coefficients in the range of 0.63 and 0.23 h−1 involving lower values than those found for natural apatites in previous studies. Scanning Electron Microscopy images showed that apatite particles in the granules were embedded in the binder and were not readily accessible to act as seeds for calcium phosphate precipitation. The retention processes differ depending on the supersaturation of the solution with respect to calcium phosphate phases: at low calcium concentrations (69.8 ± 3.9 mg·L−1), hydroxyapatite precipitates fill up the porosity of the binder up to a depth of 100–300 μm from the granule surface; at higher calcium concentrations (112.7 ± 7.4 mg·L−1) precipitation occurs at the granule surface, forming successive layers of hydroxyapatite and carbonated calcium phosphates.
format	article
author	Laura Delgado-González Bruno Lartiges Mathieu Gautier Stéphane Troesch Pascal Molle
author_facet	Laura Delgado-González Bruno Lartiges Mathieu Gautier Stéphane Troesch Pascal Molle
author_sort	Laura Delgado-González
title	Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
title_short	Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
title_full	Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
title_fullStr	Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
title_full_unstemmed	Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
title_sort	phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/873283fd54954f3f8b8387518f80b318
work_keys_str_mv	AT lauradelgadogonzalez phosphorusretentionbygranulatedapatiteassessingmaximumretentioncapacitykineticsandretentionprocesses AT brunolartiges phosphorusretentionbygranulatedapatiteassessingmaximumretentioncapacitykineticsandretentionprocesses AT mathieugautier phosphorusretentionbygranulatedapatiteassessingmaximumretentioncapacitykineticsandretentionprocesses AT stephanetroesch phosphorusretentionbygranulatedapatiteassessingmaximumretentioncapacitykineticsandretentionprocesses AT pascalmolle phosphorusretentionbygranulatedapatiteassessingmaximumretentioncapacitykineticsandretentionprocesses
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Phosphorus retention by granulated apatite: assessing maximum retention capacity, kinetics and retention processes

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