To effectively utilize a chlorine/chloramine disinfection approach, an understanding of the decay rate of
chlorine and the formation rate of disinfection byproducts (DBPs) during the short period that free chlorine is in contact with the
water is needed. The impact of chlorine dose, treatment, pH, and temperature upon short-term chlorine
decay and DBP formation kinetics for one source water was assessed. Short-term chlorine decay kinetics
were affected by dose, treatment, and pH. Temperature did not appear to have an effect on chlorine decay
in the short term. Dose did not effect the kinetics relative to the long term chlorine demand. The ratio of
long term chlorine demand to total organic carbon (TOC) was a useful tool for understanding the effect of treatment on the
chlorine-reactivity of the remaining natural organic matter (NOM). The application of the Michaelis - Menten did not
appropriately fit the data in the short term time period for any parameter set. The immediate (~ 5-min)
formation of haloacetic acid (HAA9) was greater than that for total trihalomethanes (TTHM) relative to the maximum formation (120 hrs) for all
experimental runs. The short term kinetics for HAA9 formation were higher than that for TTHM for all
experimental runs. This implies that for some waters using a chlorine/chloramine approach the short term
HAA9 formation could be limiting. Chlorine dose changes had a greater impact upon HAA9 formation
than TTHM formation for all times. However, temperature and pH changes had a greater impact on
TTHM formation than HAA9 formation for all times. Treatment changes equally impacted THM
formation and HAA formation for all times. Studies on additional waters are ongoing.
Includes 25 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 440 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 20 |
| Published : | 06/16/2002 |
