Volume 6, Issue 4 (April 2009)

    Ecotoxicological Assessment of an In-Lake Remediation Method

    (Received 7 October 2008; accepted 17 February 2009)

    Published Online: 2009

    CODEN: JAIOAD

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    Abstract

    Eutrophication and contaminated sediments are preoccupying issues in aquatic ecosystems and water resources protection. Saint-Augustin Lake (Quebec, Canada) is affected by both problems (eutrophication and contaminated sediment) and the presence of de-icing salts. According to sustainable management principles, Galvez and collaborators are developing an in-lake remediation method to restore eutrophicated lakes which consists of (a) the precipitation of the phosphorus present in the water column by the addition of alum in association with (b) the deposit of an active capping layer (calcite+sand) to isolate P, Al, and the contaminated sediments. The objective of this study is to assess the ecotoxicological impact of this restoration method for the Saint-Augustin Lake. Two ecotoxicological approaches will be used to assess this impact: (a) single-species bioassays using algal (Pseudokirchneriella subcapitata; growth), duckweed (Lemna minor; growth), daphnid (Daphnia magna; survival and reproduction), amphipod (Hyalella azteca; survival and reproduction), and invertebrate (Chironomus riparius; survival, growth, and emergence); and (b) a 2-L microcosm assay using the same organisms for purpose of comparisons. Alum toxicity, calcite impact, and organisms’ recolonization ability will be studied separately: first in artificial conditions, by using formulated sediments and artificial water and by considering de-icing salts impact, and secondly by using the sediments and overlying water of the Saint-Augustin lake. Preliminary results are available and presented here. No effect was measured for salt (NaCl) toxicity on algae, daphnids, chironomids, and amphipods. Alum inhibited algal growth strongly, had no impact on D. magna mobility and survival, but a clear dose-effect response was observed for daphnid reproduction. The global remediation method had almost the same effect as alum on P. subcapitata but stimulated daphnid reproduction at 10 mg/L alum, while it was reduced with 20 mg/L, and completely inhibited with 30 mg/L.


    Author Information:

    Soumis-Dugas, Gabriel
    M.Sc. Student, Laval University, Civil Engineering Department, Quebec

    Triffaut-Bouchet, Gaëlle
    Ph.D., Research Professional, CEAEQ, Division de l’Écotoxicologie et de l’Évaluation du risque, Quebec

    Galvez, Rosa
    Ph.D., Professor, Laval University, Civil Engineering Department, Quebec

    Martel, Louis
    M.Sc., Research Professional, CEAEQ, Division de l’Écotoxicologie et de l’Évaluation du risque, Quebec


    Stock #: JAI102181

    ISSN: 1546-962X

    DOI: 10.1520/JAI102181

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    Author
    Title Ecotoxicological Assessment of an In-Lake Remediation Method
    Symposium Fourth Symposium on Contaminated Sediments: Sustainable Management and Remediation, 2009-07-03
    Committee E01