Method for inhibition of growth of organisms on faces of...

B - Operations – Transporting – 63 – B

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B63B 59/04 (2006.01) C23F 13/02 (2006.01)

Patent

CA 2204239

The invention concerns a method for inhibition of growth of organisms on faces of constructions (11) submerged in a liquid. In themethod, an electrically conductive structure (11) to be protected is connected as the cathode of a source (14) of direct current, or an electrically non-conductive structure (111) to be protected is first coated with an electrically conductive material (111a) and connected as the cathode of a source of direct current (14), respectively, and, as the anode (12), an anode is used that has been isolated from the structure (11) to be protected or that is placed separate from said structure, which anode is connected as the anode of the source (14) of direct current. A control signal is given to the source (14) of direct current from a control unit (15), which control signal changes the current density and/or the voltage supplied by the source (14) of direct current, whereby the pH of the liquid on the face of the structure (11) to be protected varies with such of a frequency that the microbial organisms on the face of the structure (11) to be protected cannot adapt themselves to the changing conditions.

L'invention concerne un procédé pour inhiber la croissance d'organismes sur les faces de constructions (11) submergées dans un liquide. Dans le procédé, une structure (11) conductrice d'électricité à protéger est reliée en tant que cathode à une source (14) de courant continu ou une structure (111) non conductrice d'électricité à protéger reçoit d'abord un matériau conducteur d'électricité (111a) et ensuite elle est connectée en tant que cathode à une source de courant continu (14). Comme anode (12) on utilise une anode qui a été isolée de la structure (11) à protéger ou qui est séparée de ladite structure et cette anode est connectée en tant qu'anode à la source (14) de courant continu. Un signal de commande est donné à la source (14) de courant continu depuis une unité de commande (15) qui provoque des changements de la densité de courant et/ou de la tension fournie par la source (14) de courant continu, grâce à quoi le pH du liquide sur la face de la structure (11) à protéger varie avec une fréquence telle que les organismes microbiens sur la face de la structure (11) à protéger ne puissent plus s'adapter aux conditions changeantes.

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