Chlorine demand of Savannah River water Page: 4 of 30
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Savannah River water used for cooling SRS reactors was
tested for chlorine demand and the rate of decay for both
free and total residual chlorine on seven quarterly dates
between 1986 and 1988. Test conditions included chlorine
dosages of 1, 3, and 5 mg/L and a variety of contact times
ranging from less than 1 minute to one day. Statistically
significant differences were detected in the chlorine demand
for the seven dates; however, there was no discernible
seasonality to the variation. The chlorine demand, amount of
combined residual chlorine formed and the persistence of
total residual chlorine following a dose of 5 mg/L was
significantly greater on one of the seven sampling dates
(February, 1988) compared to all of the other dates. These
differences could not be attributed to water temperature,
pH, ammonia nitrogen concentration, or the amount of
rainfall prior to or during the collection of the cooling
water. Except as noted above, dissipation of chlorine was
similar among the sampling dates. Most reactions of
available chlorine with other constituents in the cooling
water occurred in the first minute of contact, although
measurable total chlorine residuals generally persisted for
24 hours after the dose had been administered. The results
of this study indicate that, with occasional exceptions, a
chlorine dose of between 3 and 5 mg/1 will provide a free
chlorine residual of 1 mg/L in Savannah River water.
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Wilde, E.W. Chlorine demand of Savannah River water, report, January 1, 1989; Aiken, South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1094127/m1/4/: accessed March 26, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.