1.0 Ozone disinfectionOzone was discovered over 100 years ago in Berlin and has since been used for the disinfection of drinking water. Ozone disinfection has been widely used in Europe and the United States for 10 years. Disinfection is a process that eliminates most disease-causing microorganisms but does not include bacterial spores on inanimate objects. Disinfectants are the chemicals used in the disinfection process, where different disinfectants have different target ranges of the microorganism. Ozone disinfection is one of many types of disinfection techniques available. Ozone generally known as O3, where oxygen molecules are split by an energy source into oxygen atoms (O1), then when the oxygen atoms collide with oxygen molecules oxygen (O2), they are formed. an ozone gas (O3), generally used as a disinfectant. Ozone is one of the water purifiers and sterilizers that disinfects water, eliminating color, taste and odor. Ozone is produced naturally by lightning using oxygen. Ozone disinfection has been used in many industries such as the food industry; sewage treatment, drinking water and other related industries. Ozone disinfection has 20-30 times more power than chlorine disinfection and typically 4-5 times less contact time than chlorine for ozone disinfection. Ozone does not contain THMs (tri-halomethanes) or complex chlorine compounds that may cause cancer in related users. Ozone must be generated on site during the disinfection process. Most past disinfection studies with ozone have been performed in a pure aqueous system using a single organism system culture. A study by Kessel et al shows that free ozone residual of 0.05 to 0.45 mg/l is sufficient to deactivate poliovirus within 2 minutes...... middle of paper ...... on Agency, 1986)Not all leaks are acceptable because a small amount of ozone could cause an unacceptable concentration of ozone which would result in a safety problem in the workplace. The ozone monitoring system should be installed near the machine to ensure that the ozone level is always safe. Ozone has a solubility limit in water and decomposes more quickly in the water system than in the air. To ensure the maximum performance that ozone can deliver, the contactor must be well covered to maximize ozone contact with wastewater or any water using ozone disinfection. Ozone will become much more dangerous in the gaseous state for some time before rotting, so when handling the ozone gas system, extreme caution is considered a necessity for the system. Every part of the entire system must be checked before starting the ozone disinfection process..