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Chlorine Dioxide (ClO2) is not a new chemical, but instead an old one and it was initially discovered by Sir Humphrey Davy nearly 200 years ago. A yellowish-green gas in its natural state, it really is used increasingly inside our modern world as a far more effective oxidising biocide than traditional chemicals such as chlorine or bromine.So what's so special relating to this well known chemical and why is it used so widely in industrial water treatment?chlordioxidlösung It possesses many key properties that differentiate it from other oxidising biocides and regulate how it can be used. For example, at room temperature, this can be a water-soluble gas that dissolves in water BUT does not react with the water. This compares with traditional biocidal chemicals such as for example chlorine or bromine which react with water giving solutions containing a range of ionic species.As a dissolved non-ionic gas, solutions of chlorine dioxide are particularly effective in controlling the forming of bio-films. The effectiveness of ClO2 in penetrating and controlling bio-film has been demonstrated in a laboratory environment where bio-film growth from a contaminated water is in comparison to that of exactly the same water with either ClO2 or chlorine (Cl2), added at 1ppm for 1hour/day or 1ppm for 15mins x4 /day. The biocidal ramifications of chlorine dioxide are unaffected by system pH in the range 4 -10. Most water systems come in this band.Chlorine dioxide selectively oxidises organic material without chlorination - will not give rise to chlorinated by-products. In other tests associated with chlorine dioxide water treatment, the selectivity of ClO2 compared to Cl2 is has also shown. The addition of ClO2 to a polluted water immediately produces a reserve, whereas a considerable concentration of Cl2 needs to be added before a reserve is generated. Because Cl2 reacts with the pollutants, ClO2 does not. It is so reactive that it cannot be compressed or liquefied. In practice it really is produced on-site for immediate water treatment usage.So to summarise, chlorine dioxide is really a gas that's both highly water soluble and volatile. Due to its unstable nature, it cannot be compressed or liquefied and is always produced on-site. It is just a selective oxidising agent and broad spectrum biocide which will not produce chlorinated by-products. It is often the biocide/disinfectant of preference in food washing applications and it is effective in controlling legionella. For these reasons and more, it has become an extremely important component of the water treatment industry.