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Table 2

The CT or dosage for different disinfectants to inactivate enteric viruses

Disinfectant removalFree chlorine (min mg/L)Monochloramine (min mg/L)Chlorine dioxide (min mg/L)Ozone (min mg/L)UV (mJ/cm2)
2 Log10, 99% 5.8/3.0 1243/643 8.4/4.2 0.90/0.50 100 
3 Log10, 99% 8.7/4.0 2063/1067 25.6/12.8 1.40/0.80 143 
4 Log10, 99% 11.6/6.0 2883/1491 50.1/25.1 1.80/1.00 186 
Disinfectant removalFree chlorine (min mg/L)Monochloramine (min mg/L)Chlorine dioxide (min mg/L)Ozone (min mg/L)UV (mJ/cm2)
2 Log10, 99% 5.8/3.0 1243/643 8.4/4.2 0.90/0.50 100 
3 Log10, 99% 8.7/4.0 2063/1067 25.6/12.8 1.40/0.80 143 
4 Log10, 99% 11.6/6.0 2883/1491 50.1/25.1 1.80/1.00 186 

Note: The former four columns present the enteric viruses inactivation efficiency by main chemical disinfectants on 1 or 10 °C (separated by /). The last column presents the UV inactivation efficiency on adenovirus which is the most resistant to UV.

The successful practices in WWTPs in China and other countries have proven that this virus cannot spread in wastewater once the disinfection process is conducted properly.

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