|
The purpose of all Advanced Oxidation Technologies (AOTs), is to produce hydroxyl radicals (·OH), a highly reactive oxidizing agent that reacts with and destroys most organic pollutants in water. There are a variety of advanced oxidation approaches commercially available. Each has a scope of wastewater treatment applications that it is best suited for.
Bacterial Disinfection and Viral Inactivation
The extent of bacteria destruction and viral inactivation is related to the concentration of ozone in the water and its contact time with the microorganisms. Bacteria are the most rapidly destroyed. E-Coli bacteria are destroyed by ozone concentrations of just over .01 mg/liter and contact time of 15 second at temperatures of 25 degrees C (77 degrees F) and 30 degrees C (86 degrees F).* Streptococcus facials are much more easily destroyed. At ozone concentrations of about 0.025 mg/liter, 99.99% inactivation is obtained in 20 seconds or less at both temperatures. Viruses are more resistant than bacteria. Polio virus types I, II and III are inactivated by exposure to concentrations of dissolved ozone of 0.4 mg/liter over a four minute contact period.
Oxidation of Inorganics
In the case of iron, manganese and the several arsenide or arsenate compounds, oxidation takes place very rapidly, leaving insoluble compounds which are easily removed by an activated carbon filter. Sulfide ions are oxidized sequentially to sulfate ions, an innocuous substance. The first stage of this oxidation is very rapid, quickly and efficiently removing any sulfurous odors. Nitrite ions are oxidized to nitrate ions, which are stable and innocuous.
Oxidation of Organics - Pesticides, etc.
Ozone if a very powerful agent in treating organic materials. Organics are either natural (humic and fulvic acids) or synthetic (detergents, pesticides) in nature. Some organics react with ozone very rapidly to destruction, within minutes or even seconds (phenol, formic acid), whereas other react more slowly with ozone (humic, fulvic acids, several pesticides, dichloromethane, etc.).Soaking your meats and produce in Ozone water for 10 to 15 min. can greatly reduce contamination.
|
