DiaZone "divided" cells incorporate a special membrane that separates the anolyte flow (water flowing past anode) from the catholyte flow (water flowing past cathode) in the cell. In this case, the anodes in the cell produce both oxygen and ozone from water as water simply flows through the cell. As ozone is an extremely powerful oxidant, only a very low concentration of ozone is required in solution, measured in parts per billion (ppb), to achieve high levels of disinfection.
This electrolytic cell produces ozone (O3) for the "O" in H2O without any chemical addition. The ozone generated in the cell remains in solution to destroy microbes of all types including all know bacteria and viruses. The rate of microbial lysis is a function of the ozone concentration and treatment time but, generally speaking, at normal ozone concentrations most bacteria and viruses are killed within a few minutes.
DiaZone ozone-water (OW) cells are divided into two equal halves, each half having one or more electrodes separated by the membrane. The high performance electrodes are conductive diamond and are paired either side of the membrane which acts as a solid polymer electrolyte. Ozone is generated in the anolyte stream at the interface between the diamond electrode and the membrane. Hydrogen ions and metal cations (positively charged ions) pass through the membrane to the cathodes.
To prevent passivation and cell failure caused by the build up of metals, such as calcium, on the cathodes, the polarity of the cell is reversed at regular intervals. Thus polarity reversal maintains electrodes in good condition thereby maintaining cell performance without the need for chemical cleaning agents.
DiaZone "undivided" (open) cells produce a range of mixed oxidants that typically includes peroxo compounds (such as peroxocarbonate and peroxodisulphate) from their respective mineral salts present in the feed water, and also hydrogen peroxide. Hypochlorous acid and hypochlorite are generated from chloride ions, subject to pH value. Open cells are preferred for cooling tower and evaporative condenser applications. Peroxo compounds and hypochlorous acid combined provide a powerful and effective solution for cooling tower disinfection.