La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Conversion of dissolved phosphorus in runoff by ferric sulfate to a form less available to algae: Field performance and cost assessment
Auteurs :	Risto Uusitalo, Auteur ; Aaro Narvanen, Auteur ; Antti Kaseva, Auteur ; Aino Launto-Tiuttu, Auteur ; Janne Heikkinen, Auteur ; Paivi Joki-Heiskala, Auteur ; Kimmo Rasa, Auteur ; Tapio Salo, Auteur
Type de document :	Article
Dans :	AMBIO (44 MAR 2015)
Article en page(s) :	S286-S296
Langues:	Anglais
Résumé :	Conversion of dissolved P by ferric sulfate into a particulate form sparingly available to algae was studied in 15 ditches in Finland using stand-alone dispensers for ferric sulfate administration. Ferric sulfate typically converted 60-70 % of dissolved P into iron-associated form, a process which required 250-650 kg per kg dissolved P. Mean cost was 160 EUR per kg P converted (range 20-400 EUR kg(-1)). The costs were lowest at sites characterized by high dissolved P concentrations and small catchment area. At best, the treatment was efficient and cost-effective, but to limit the costs and the risks, ferric sulfate dispensers should only be installed in small critical source areas.

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