TABLE 4.
Concentrations of mycobacteria isolated from the water from the Ivry treatment plant at some intermediate stages of treatment, in which slow sand filtration is used
| Date (mo/day/yr) | Process | Organism(s) | Concn (CFU · liter−1) |
|---|---|---|---|
| 3/28/2000 | Prefiltration | NDa | |
| Slow sand filtration | ND | ||
| Ozone treatment | ND | ||
| GAC filtration | M. peregrinum | >3,000 | |
| Treated water (chlorination) | ND | ||
| 7/18/2000 | Prefiltration | Contaminated | |
| Slow sand filtration | Unidentified mycobacteria | 10 | |
| Ozone treatment | M. nonchromogenicum | 10 | |
| GAC filtration | M. fortuitum | >>3,000 | |
| Treated water (chlorination) | ND | ||
| 10/17/2000 | Prefiltration | M. nonchromogenicum | 100 |
| Slow sand filtration | M. peregrinum | 800 | |
| M. flavescens | 10 | ||
| M. chelonae | 10 | ||
| Ozone treatment | ND | ||
| GAC filtration | M. fortuitum-M. peregrinum | 2,000 | |
| Treated water (chlorination) | ND | ||
| 1/23/2001 | Prefiltration | M. duvalii | 20 |
| Unidentified mycobacteria | 300 | ||
| Unidentified mycobacteria | 2,000 | ||
| M. flavescens | 20 | ||
| Slow sand filtration | M. peregrinum | >400 | |
| Ozone treatment | ND | ||
| GAC filtration | M. peregrinum | >3,000 | |
| Treated water (chlorination) | M. nonchromogenicum | 60 | |
| 4/17/2001 | Prefiltration | Contaminated | |
| Slow sand filtration | Unidentified mycobacteria | 10 | |
| Ozone treatment | ND | ||
| GAC filtration | M. peregrinum | 1,500 | |
| Treated water (chlorination) | ND | ||
| 7/17/2001 | Prefiltration | Contaminated | |
| Slow sand filtration | Contaminated | ||
| Ozone treatment | ND | ||
| GAC filtration | M. fortuitum | 2,000 | |
| Unidentified mycobacteria | 10 | ||
| Treated water (chlorination) | ND |
a
ND, not detected.