• AWWA JAW60540

AWWA JAW60540

Journal AWWA - Sequential Disinfection of Adenovirus Type 2 with UV-Chlorine-Chloramine

American Water Works Association , 10/01/2004

Publisher: AWWA

File Format: PDF

$15.00$30.00


Bench-scale experiments determined the inactivation rates of adenovirus serotype 2 with low-pressure, high-output ultraviolet (UV) light, chlorine (Cl2), and preformed chloramines. Studies with sequential chloramines were also done to mimic water treatment practices. Sequential experiments with adenovirus serotype 2 suspended in laboratory-grade water and natural waters containing ammonia were exposed to either UV light followed by Cl2/chloramines or the reverse sequence. Adenovirus log reductions were quantified through cell culture techniques. A free Cl2 C × T (concentration × time) of 1.22 mg-min/L resulted in a 3.72-log reduction, a preformed chloramine C × T of 264.5 mg-min/L resulted in a 1.2-log reduction, a sequential chloramine C × T of 40.5 mg-min/L resulted in a 1-log reduction, and a UV dose of 40 mJ/cm2 resulted in a 1-log reduction. Up to 4-log reductions were achieved with a UV dose of 40 mJ/cm2 followed by a sequential chloramine C × T of 27.2 mg-min/L. This suggests that sequential disinfection may be the best option for dealing with UV-resistant organisms such as adenoviruses. Includes 39 references, figures.

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