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Applications of Ozone in Water
Ozone has been used for approximately a century in the treatment of potable water. Ozone has been used mainly as a disinfectant and sanitiser, but as a result of its strong oxidising powers it has found additional applications in water treatment, especially for taste and odor control, colour removal and removing iron and manganese salts. The huge increase in the bottled water industry over the last few decades was made possible, partly due to the effectiveness of ozone and many countries, including the UK, are replacing chlorine treatment with ozonation in the production of potable water. In recent years concern has grown regarding possible health effects of synthetic organic compounds in water and of chlorinated organic compounds synthesised during treatment by the reaction of chlorine with organic compounds. Such concern has focused attention on ozone to remove these synthetic organics and minimise the use of chlorine. Applications Process Water
Ozonated water is highly effective in killing both gram-positive and gram-negative food related bacteria including spoilage organisms, faecal contaminants and food borne pathogens. Cooling Towers
Ozonated cooling tower water prevents the growth of micro-organisms and reduces calcium carbonate scale, common occurrences in towers due to opportunistic micro-organisms present in static/stagnant water. Wash Water
Ozonated water can be a cost-effective alternative to wet chemical sanitizers and disinfectants. This avoids the added costs of the chemicals as well as the costs of labor associated with the transport, storage and handling of hazardous chemicals. Ground Water
Water supplied from private wells or boreholes can be of varying quality as pollutants can lead into aquifers from surrounding land. Ozone can offer, after treatment, a solution to guarantee water purity. Effluent Treatment
Using ozone, discharge contaminants can be reduced, effluent loading is less and surcharges and operating costs for industrial users can be lower. Efficient filtration and mass transfer of ozone into waste streams promotes the removal of fats, oils and greases. |
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