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Effects of hypolimnetic water aeration and iron-phosphate precipitation on the trophic level of Lake Krupunder

  • Lake Restoration
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Abstract

Lake Krupunder is a small, glacial, stratified lake. Before restoration it was classified as eutrophic to polytrophic. Stepwise the lake was restored to a mesotrophic status: 1. In April 1990 a deep water aeration plant was installed. Although the entire hypolimnion was sufficiently supplied with oxygen the trophic level remained high because of substochiometric natural iron concentrations. 2. In September 1991 a technical iron-phosphate precipitation was carried out, dispensing 1.8 t of iron-chloride-sulfate (‘Ferri floc’) into the hypolimnion using the aerator. Until July 1992 the chlorophyll-a concentration decreased by 90%/77% (maximum/mean value).

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  1. Fachbereich Bio-Ingenieurwesen, Produktionstechnik und Verfahrenstechnik, Fachhochschule Hamburg, Lohbrügger-Kirchstr. 65, D-21033, Hamburg, Germany

    Dieter Jaeger

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  1. Dieter Jaeger
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Jaeger, D. Effects of hypolimnetic water aeration and iron-phosphate precipitation on the trophic level of Lake Krupunder. Hydrobiologia 275, 433–444 (1994). https://doi.org/10.1007/BF00026732

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