This powerpoint presentation begins by providing a brief overview of Aurora (Colorado) Water's supply system, and process overview. A comparison of two treatment facilities, Wemlinger and Griswold, is presented, along with treatment plant upgrades, and the simultaneous addition of chlorine and chlorine
dioxide. Observations following chlorine
dioxide conversion are presented, along with optimization studies and the objectives for a follow-up study that include
expanding the previous optimization study to answer the
following questions:
can results be replicated,
does source water impact the findings, and
does seasonal variability impact the findings? Other follow-up study objectives include:
develop practical guidance for plant optimization of
Cl<sub>2</sub> and ClO<sub>2</sub>; and,
develop test procedures and protocols. Experimental approach included jar tests lasting 1 year, test conditions consisting of
initial Cl<sub>2</sub> and Cl<sub>2</sub> dose range: 0 - 1 mg/L,
based on acceptable operating
conditions at Wemlinger and Griswold WTFs, and
12 dose conditions evaluated per test. Summary of study includes the following: full scale data shows that the co-application of
chlorine and chlorine dioxide had several
advantages such as
achieves adequate CT at lower ClO<sub>2</sub> dose,
reduction in chlorite formation (compared to ClO<sub>2</sub> alone),
reduction in TTHMs (compared to chlorine alone), and
dampens the effect of TOC/UV spikes on TTHM formation.
Preliminary optimization study findings include the following:
the Cl<sub>2</sub>:ClO<sub>2</sub> dose ratio does not have an "optimal"
condition (contrary to our previous study);
chlorite formation impacted by source water and seasonal
variability; and,
TTHM concentrations reduced by limiting chlorine dose. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 30 |
| Published : | 11/01/2008 |
