Pulverizing aerator in the process of lake restotation

In 1995, the Institute of Agricultural Engineering of the Agricultural University in Poznan launched research on an integrated lake restoration technology, whose core was a wind-powered aerator capable of oxygenating also the bottom layers (the hypolimnion) of deep lakes. The aerator uses energy from the Savonius rotor mainly for water pulverizing, causing the release of gases such as hydrogen sulphide or methane, which usually result in complete water saturation and replace them with oxygen. Even the early studies showed the constructed device to be highly efficient in improving oxygen conditions in the bottom zone. Moreover, the research made it clear that the device should be equipped with an autonomous system designed to inactivate phosphorus, one of the principal factors determining the rate of lake degradation. In 2013 the first wind-driven pulverizing aerator equipped with such a new system was installed at Goreckie Lake. The research describe results of the process of the restoration of Goreckie Lake with using pulverizing aerator system conducted regularly from 2013 to 2015. It was the aim of this work. The results show that the efficience of pulverizing aerator with a phosphorus inactivation system and the efficiency of the coagulant dosage depend on the wind speed from the determined range of the speed. The technical specifications causes that the device uses only energy of the wind, which is the main advantage of the whole system. (C) 2017 Elsevier B.V. All rights reserved.