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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Jaeger, D. (1994). Effects of hypolimnetic water aeration and iron-phosphate precipitation on the trophic level of Lake Krupunder. In: Mortensen, E., Jeppesen, E., Søndergaard, M., Nielsen, L.K. (eds) Nutrient Dynamics and Biological Structure in Shallow Freshwater and Brackish Lakes. Developments in Hydrobiology, vol 94. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-2460-9_38
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DOI: https://doi.org/10.1007/978-94-017-2460-9_38
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