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Relevance of results. One of the main factors of the accelerated transition to innovative development of the economy on the basis of the formation of high-tech industries is rational nature management, which makes it possible to use the country's natural resources with the greatest impact and, on the basis of their deep processing, create new types of structural materials and promote the introduction of advanced technologies and industries. The implementation of these tasks determines the need for a well-founded p...

The object of study was Wolszty?skie Lake, (area 124.2 ha, max depth 4.2 m). That water body is flow-through lake type and it is alimented by Dojca River and total catchment area is 193,5 km2. The lake was restored using phosphorus inactivation method ? in the 2005-2006 years an aluminum coagulant PAX 18 was used for treatment and in 2013-2014 years ? iron coagulant PIX 111. The results of research revealed, that the amounts of phosphorus fractions in the bottom sediment have changed. In the 20 cm thick sediment c...