| Title |
Prediction of Cryptosporidium parvum Inactivation in Advanced Ozone Drinking Water Treatment with Lab Scale Experiments |
| Authors |
조민 ( Min Cho ) ; 정현미 ( Hyen Mi Chung ) ; 김이호 ( Ree Ho Kim ) ; 손진식 ( Jin Sik Sohn ) ; 박상정 ( Sang Jung Park ) ; 윤제용 ( Je Yong Yoon ) |
| Keywords |
Ozone; Cryptosporidium parvum; Modified Delayed Chick-Watson model; Disinfection; CT |
| Abstract |
With the appearance of pathogenic microorganisms, which were resistant to free chlorine, the significant attention to the necessity of powerful alternative disinfection methods such as ozone, chlorine dioxide, LTV irradiation to inactivating pathogens has been increased in water treatment. Among these alternative disinfection methods, ozone is well known as strong biocidal method and the usage of ozone is also increasing in Korea. However, in Korea, there has been no report on the quantitative study of Cryptosporidium parvum with ozone and its evaluation in advanced drinking water treatments. This study reports on the methodology for predicting the ozone inactivation of Cryptosporidium parvum by ozone disinfection in advanced drinking water treatment. The method is based on the fact that a specific inactivation level of microorganisms is achieved at a unique value of ozone exposures, independent of ozone dose and type of water, and quantitatively described by a delayed Chick-Watson model. The required values ^-CT for 2 log inactivation of Cryptosporidium parvum was 6.0 mg/L-min and 15.5 mg/L-min at 20℃ and 5℃, respectively. From this obtained Cryptosporidium parvum inactivation curves and calculated ^-CT values of advanced drinking water treatment water in Korea with FIA (Flow injection alaysis), we can predict that water treatment plant can achieve a 1.1~1.8 log inactivation and 0~0.4 log inactivation at 20℃ and 5℃, respectively. This methodology will be useful for drinking water treatment plants which intend to evaluate the disinfection efficiencies of their ozonation process without full scale test and direct experiments with Cryptosporidium parvum. |