Table 4.

Disinfection of SARS-CoV in wastewater by chlorine and chlorine dioxide^a

Disinfectants	Dose (mg/L)	Inactivation rate (%)			Free residue chlorine (mg/L)
		SARS-CoV	f2 phage	E. coli (8099)
Chlorine
	5	68.38	30.91	0	0.11
	10	100	27.27	0	0.40
	20	100	79.09	100	0.50
	40	100	100	100	0.82
Chlorine dioxide
	5	0	0	0	0.00
	10	94.38	32.73	0	0.00
	20	82.22	42.73	0	0.00
	40	100	60.00	99.46	2.19

^aSARS-CoV, 10^1.75TCID₅₀/ml; f₂, 1.1 × 10⁵ pfu/L; E. coli, 1.3 × 10⁶ cfu/L; temperature, 20 °C; disinfection for 30 min. Results from three experiments.