Department of Environmental Engineering, Universidade Estadual do Centro-Oeste, PR153, km 07, Riozinho, Cx Postal 21 CEP: 84500-000, Irati-PR, Brazil.
Environ Technol. 2011 Aug-Sep;32(11-12):1401-8. doi: 10.1080/09593330.2010.537373.
Water disinfection assays were carried out using ozone and chlorine in non-sequential steps--the individual method--and in sequential steps--the combined ozone/chlorine method. Escherichia coli strain ATCC 11229 was used as the indicator microorganism. For the assays using the individual method, the applied dosages of ozone were 2.0, 3.0 and 5.0 mg/L, and 2.0 and 5.0 mg/L of chlorine were used. For the assays applying the combined method, the dosages (dosage combination) were, in mg/L: 2.0 O3 + 2.0 Cl, 3.0 O3 + 2.0 Cl2, 5.0 O3 + 2.0 Cl2 and 2.0 O3 + 5.0 Cl2. The applied contact times were 5, 10, 15 and 20 minutes for the individual method as well as for the combined method. For all used dosages and contact times, E. coli inactivation was superior to the inactivation obtained in the individual method, indicating the occurrence of synergism for E. coli inactivation in the combined method.
采用顺序和非顺序步骤（单独法），即用臭氧和氯气进行水消毒检测，单独法中臭氧的使用剂量分别为 2.0、3.0 和 5.0mg/L，氯气的使用剂量为 2.0 和 5.0mg/L；组合法中（剂量组合）使用的剂量为：2.0O3+2.0Cl、3.0O3+2.0Cl2、5.0O3+2.0Cl2 和 2.0O3+5.0Cl2，接触时间为 5、10、15 和 20 分钟。对于所有使用的剂量和接触时间，大肠杆菌的失活率都优于单独法的失活率，这表明在组合法中，大肠杆菌的失活存在协同作用。
