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Digitale Medien

Effects of hypolimnetic water aeration and iron-phosphate precipitation on the trophic level of Lake Krupunder (1994)

Jaeger, Dieter

Springer

Hydrobiologia 275-276 (1994), S. 433-444

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ISSN: 1573-5117

Schlagwort(e): lake restoration ; hypolimnetic aeration ; iron-phosphate precipitation ; eutrophication ; reoligotrophication

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: 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).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00026732

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