GNIEZNO

Recultivation of Jelonek and Winiary lakes in Gniezno by inactivation of phosphorus in bottom sediments

Chemical precipitation of phosphorus with coagulants reduces the amount of nutrients and thereby reduces the intensity of the development of algae, resulting in improved water quality and increase its transparency.

Phosphorus inactivation method is already used on the various reservoirs, but the method of inactivating phosphorus in bottom sediments and the supporting work is an innovation.

When using the vessel called Proteus does not need protection to the area storing sediments (no problem of smell!). Reclamation work is conducted from the surface of the water, without any risk for the environment and are safe for biological life. This method is especially recommended for shallow lakes.

This is the only method at the world scale recommended to reclamation of lakes located in the city center.

Corresponds to the Water Framework Directive (2000/60/EC) requires.

The surface module is responsible for moving the whole vessel and control the work of the underwater module. The underwater module is responsible for triggering controlled resuspension of sediments in its own closed space, as well as for oxygenating the sediments and applying a substance which blocks phosphorus in bottom sediments.

Finished

The method involves blocking (inactivation) of phosphorus directly in bottom sediments, using appropriate chemical substances (coagulants), which results in decreased amounts of phosphorus available in the water to, e.g. Cyanophyceae algae or phytoplankton algae, which could generate water blooming.

In the recultivation process the important variables included site of coagulant dosing and induction of artificial resuspension of bottom sediments. Such activities allowed for a penetration of the dosed chemical substances into the outer layer of the sediments, the most active layer in the process of the inner feeding and, thus, participating in circulation of biogens, including phosphorus, between the sediments and water. Apart from trapping the phosphorus already present in the sediments, the procedure of administering chemical compounds directly to bottom sediments permits to improve their condition: the sediments may recover or increase their ability to store phosphorus and, in this way, reduce concentration of phosphorus in the water controlling its level in longer periods of time. The method affects the dynamics of phosphorus circulation in the container.

PROTE Technologies for our Environment, Ltd. , Pozna, Poland ( PROTE Technologie dla ?rodowiska Sp. z o.o.) PROTEUS has been registered by Inland Navigation Office, Poland (Urzdeglugi ródldowej) and at the same time has been approved by National Labor Inspectorate.

Lake managing

Expansion to new areas

International dissemination of the Project

Financial resources for expansion process