Rutzen, C. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Stratified Lakes,
Dittrich, M. Swiss Federal Institute for Environmental Science and Technology , Limnological Research Center, maria.dittrich@eawag.ch
Gabriel, O. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Stratified Lakes,
Koschel, R. H.. Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Stratified Lakes,

 
PHOSPHORUS RELEASE DURING ARTIFICIALLY INDUCED CALCITE PRECIPITATION IN A STRATIFIED HARDWATER LAKE
 
The phosphorus release during artificially induced calcite precipitation was studied as a restoration technology in the eutrophic hardwater lake Schmaler Luzin (East-North Germany). The artificial calcite precipitation was induced by addition of calcium hydroxide in the hypolimnion of the stratified lake during the summer stratification period in 1996 and 1997. Changes in the composition of the sediment, pore water profiles of dissolved matter (pH, dissolved inorganic carbon, phosphorus, calcium), P-binding forms in sediment and in sedimentation traps were studied during one year. Laboratory experiments were performed for the phosphorus release from undistributed sediment corn and incubation experiments were carried out with sequential fractionation. The P content of sediment decreased and its binding forms in surface sediment is similar to those in grey marl (meso- to oligotrophic state). The P binding forms at the sediment surface have a high content of P bound to calcite after the treatments. The presence of small calcite crystals indicates calcite precipitation at the sediment surface.
 
Day: Friday, Feb. 5
Time: 09:00 - 09:15am
Location: Sweeney Center
 
Code: CS63FR0900S