Coagulation à l'alun et recouvrement actif de calcaire pour contrer l'eutrophisation du lac Saint-Augustin (Québec) : essais In situ en enclos

Authors: Bourget, Alexandre
Advisor: Galvez, RosaLeroueil, Serge
Abstract: A pilot project has been conducted for the remediation of eutrophicated Saint-Augustin lake (Quebec) during the summer of 2009. The efficiency of several restoration techniques has been accessed during an in situ experiment in four isolated water enclosures: (i) alum coagulation/flocculation, (ii) active capping of sediments using limestone, (iii) combination of those methods (Alum+Limestone), and (iv) control enclosure. The control and alum enclosures reached high soluble P concentrations (0.58 to 1.05 mg/l). The Alum+Limestone enclosure presented the strongest reduction in P concentrations compared to the control enclosure (83 to 90%), followed by limestone only (65 to 76%). Carlson’s trophic status indices (TSI) calculations show the best option to be Alum+Limestone with TSI (49 to 81) closest to the lake (42 to 73). Infestation of the sediments by Cipangopaludina chinensis snails observed before experimentation might have served as a strong bioturbation agent, possibly explaining the hypereutrophic state of the enclosures.
Document Type: Mémoire de maîtrise
Issue Date: 2011
Open Access Date: 18 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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