AWWA WQTC65850

Classical methods for the disinfection of drinking water, such as the use of chlorine andchloramines, are efficient at treating large volumes. However, some disadvantages exist such asthe formation of disinfection byproducts and parasite resistance. Alternative methods for waterdisinfection are being used often in conjunction with chlorine to address these problems. One ofthese alternatives is using the solution generated from the electrolysis of brine, consisting of boththe anolyte and catholyte, for the disinfection of drinking water. Although this solution consistsprimarily of chlorine, it likely contains numerous other oxidant species generated during theelectrolysis process and is often termed a mixed-oxidant solution (MOS).Not only has MOS been shown to be more effective at the disinfection of drinking watercompared to equivalent doses of chlorine, but it also has been shown to have some interestingcharacteristics. These include the inhibition of biofilm within the pipe system, and the inactivationof Cryptosporidium parvum, a chlorine resistant parasite. However, to date, attempts to identifywhat species in the MOS is responsible for the enhanced properties have been challenging andunsuccessful.The pros and cons of various methods used to identify the oxidant species in the mixed-oxidantsolutions are described in this paper, including the use of quenching and trapping reagentsto selectively isolate individual oxidants. Techniques examined include those for the detectionof hydrogen peroxide, ozone, chlorine, and the hydroxyl radical. Advances in characterizing thechemical constituents of the mixed oxidant solutions are discussed. Includes 11 references, tables.

Product Details

Edition:

Vol. - No.

Published:

11/01/2007

Number of Pages:

6

File Size:

1 file , 140 KB