TABLE 2.
AD40 and FCV Ct99.99% ranges observed from bench-scale inactivation experiments, Ct99.99% values calculated by fitting the EFH model to bench-scale data, and EPA guidance manual Ct99.99% values
| BDF water conditions
|
Ct99.99% (mg/liter × min)
|
|||||
|---|---|---|---|---|---|---|
| °C | pH | AD40 observed ranges | AD40 EFH modela | FCV observed ranges | FCV EFH modela | EPA guidance manual |
| 5 | 6 | >0.77 to <1.53 | 1.28 | >20.20 to <30.30 | 20.85 | 33.5 |
| 5 | 8 | >0.80 to <1.59 | 0.67 | >0.68 (3.60 log)b | 1.08 | 33.5 |
| 15 | 6 | >0.49 to <0.74 | 0.92 | >4.20 to <6.72 | 7.13 | 16.8 |
| 15 | 8 | <0.12c | 0.11 | <0.18d | 0.19 | 16.8 |
a
Ct values calculated using k′ = 0.0001 (conditions of negligible disinfectant decay).
b
Duration of experiment was not long enough to achieve 99.99% inactivation. Ct value corresponds to 3.60-log inactivation by 45 s.
c
Value is ≥4.21-log inactivation by 15 s.
d
Value is ≥4.15-log inactivation by 15 s.