RESUMEN
Total and Fecal coliforms [TC and FC], heterotrophic plate count [HPC], were counted by microbiological method and E.coli O157:H7 were detected through immunological and Real time PCR methods in water intake and all of units of Isfahan water treatment plant [IWTP]. The microbial profile including TC, FC, and HPC, were monitored and turbidity and total organic carbon were analyzed in 8 locations of water intake, and unit operation and processes of IWTP, including, inlet, sedimentation, ozonation, and filtration and finished water. Immunological method through anti-serum kits and molecular method of RT-PCR were used to detect E.coli O157:H7 in the 8 locations and also the sludge of the sedimentation basin and filters backwash water of IWTP. Survival of E.coli O157:H7 in sludge sample of sedimentation basin was indicated by formation of agglutination particles in immunological method and through indicator probes in the RT-PCR method. However, E.coli O157:H7 was not detected in water samples of other units of IWTP. The removal percent of TC, FC, and HPC were: 59.5, 49, and 54.8% in sedimentation basin; 66, 45.8, and 57% in ozonation;: 98.8, 98, and 78.8 in the filtration; and 96, 100, 91% in disinfection, respectively. This study approved the existence of the pathogenic coliform, E.coli O157:H7 in the sludge of sedimentation basin. Absent of E.coli O157:H7 in the finished water indicates that the existing units of IWTP could eliminate these pathogenic bacteria, before reaching the final units of the plant, including the filters and disinfection