Environmental impact of two successive chemical treatments in a small shallow eutrophied lake: Part I. Case of aluminium sulphate

Abstract : This paper deals with the efficiency and effects of addition of aluminium sulphate on soft water quality of a shallow eutrophic lake. Almost all the controlled variables improved with treatment, especially nutrient concentrations such as soluble reactive phosphorus (SRP) and transparency. However, aluminium sulphate was not added in sufficient quantity to reduce the total phosphorus content, SRP concentration was significantly reduced in the short term. Moreover, external loading of phosphorus was high and not taken into account by the in-lake treatments. Finally, resuspension of sediment (polymictic lake) removed the alum hydroxide layer on the sediment surface, which reduced treatment effectiveness. No significant pH decrease was noted following alum addition. According to bibliographical toxicological data, monomeric aluminium content does not show any toxic effect on aquatic fauna and flora. In spite of low SRP in the water column, the treatment did not prevent appearance of Microcystis sp. colony (>10 colony per ml) approximately 30 days after alum application
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-unilim.archives-ouvertes.fr/hal-00931146
Contributeur : Véronique Deluchat <>
Soumis le : mercredi 15 janvier 2014 - 00:18:42
Dernière modification le : jeudi 7 février 2019 - 17:25:17

Identifiants

  • HAL Id : hal-00931146, version 1

Collections

Citation

Eric D. van Hullebusch, Véronique Deluchat, Philippe Chazal, Michel Baudu. Environmental impact of two successive chemical treatments in a small shallow eutrophied lake: Part I. Case of aluminium sulphate. Environmental Pollution, Elsevier, 2002, 120, pp.617-626. ⟨hal-00931146⟩

Partager

Métriques

Consultations de la notice

357