Table 5.
Measured chlorine consumption and DBP production in the washing bath experiment (n = 2)
| Parameter | Mean value ± SD |
||
|---|---|---|---|
| Tap water | Water with COD of 500 mg O2/liter | Water with COD of 1,000 mg O2/liter | |
| COD (mg O2/liter) | 36 ± 13 | 500 ± 25 | 1,017 ± 4 |
| Free chlorine, residual (mg/liter) | 1.17 ± 0.26 | 1.16 ± 0.33 | 1.09 ± 0.39 |
| Free chlorine dose (mg/liter/min) | 0.3 ± 0.02 | 2.6 ± 0.2 | 6.6 ± 1.2 |
| Chlorination breakpoint (mg/liter) | 1.9 ± 0.2 | 81.0 ± 14.4 | 244.5 ± 19.1 |
| Cumulative dose (mg/liter) | 17.1 ± 2.1 | 235.8 ± 23.6 | 609.0 ± 59.4 |
| Reduction of E. coli O157 on lettuce (log CFU/g) | 0.6 ± 0.2 | 0.6 ± 0.2 | 1.6 ± 0.2 |
| Total trihalomethanes (water) (μg/liter) | <6.3 | 27.8 ± 5.4 | 124.5 ± 13.4 |
| Chloroform | <6.3 | 27.8 ± 5.4 | 111.1 ± 17.3 |
| Bromodichloromethane | <6.3 | <6.3 | 13.4 ± 2.9 |
| Total trihalomethanes (lettuce) (μg/g) | <6.3 | <6.3 | <6.3 |