Table 2.
The time (day) required for infectivity reduction of viruses in different water samples at 23 °C and 4 °C (data were adapted from Gundy et al., 2008).
| Reduction (99%) |
|||
|---|---|---|---|
| HCoV | FIPV | PV-1 | |
| 1. Temperature (23 °C) | |||
| Tap water (filtered) | 6.76 (10.1) | 6.76 (10.1) | 43.3 (64.9) |
| Tap water (unfiltered) | 8.09 (12.1) | 8.32 (12.5) | 47.5 (71.3) |
| Primary effluent (filtered) | 1.57 (2.35) | 1.60 (2.40) | 23.6 (35.5) |
| Primary effluent (unfiltered) | 2.36 (3.54) | 1.71 (2.56) | 7.27 (10.9) |
| Secondary effluent (unfiltered) | 1.85 (2.77) | 1.62 (2.42) | 3.83 (5.74) |
| 2. Temperature (4 °C) | |||
| Tap water (filtered) | 392 (588) | 87.0 (130) | 135 (203) |
Note: Human coronavirus 229E (HCoV), (animal) feline infectious peritonitis virus (FIPV), and poliovirus 1 (PV-1); Data in parenthesis (day) represents the reduction rate of 99.9%. The Primary effluent was collected after settling; meanwhile the secondary effluent was collected before chlorination.