AWWA JAW60540

Bench-scale experiments determined the inactivation rates of adenovirus serotype 2 withlow-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 waterand natural waters containing ammonia were exposed to either UV light followed byCl₂/chloramines or the reverse sequence. Adenovirus log reductions were quantified throughcell culture techniques. A free Cl2 C × T (concentration × time) of 1.22 mg-min/L resulted in a3.72-log reduction, a preformed chloramine C × T of 264.5 mg-min/L resulted in a 1.2-logreduction, a sequential chloramine C × T of 40.5 mg-min/L resulted in a 1-log reduction, anda UV dose of 40 mJ/cm₂ resulted in a 1-log reduction. Up to 4-log reductions were achievedwith 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-resistantorganisms such as adenoviruses. Includes 39 references, figures.

Product Details

Edition:

Vol. 96 - No. 10

Published:

10/01/2004

Number of Pages:

7

File Size:

1 file , 210 KB