A successful start-up of a novel ion exchange color and disinfection byproduct (DBP)
precursor removal treatment system was completed in 2000. This treatment system was
used in conjunction with the existing 16 MGD lime softening treatment units and filters
for potable water treatment. A side stream is removed from the existing lime softening
treated water and passed through a 6 MGD ion exchange treatment unit to remove Total
Organic Carbon (TOC) and color, thereby reducing DBP formation potential in the
finished water. The existing lime softening equipment and the existing wells were in
good condition and produced acceptable water but higher quality water was desired. The
City compared various options such as anion exchange, membrane softening, reverse
osmosis(using a saline water source) and ozone. It was determined that the most cost
effective method for improving the water quality was the anion exchange system. It was
also determined that this system was very efficient with respect to generating wastewater
flows. Less than 1% of the water treated is sent to waste disposal verses approximately
15% for a comparable membrane treatment system. Essentially all the color is stripped
from this side stream. Removal of these precursors reduced total trihalomethane (TTHM)
formation during disinfection with chloramines and allows the plant to meet current and
most likely future US Environmental Protection Agency DBP regulations at a very low installed capital and operations and maintenance cost,
significantly lower than a membrane treatment system. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 310 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 6 |
| Published : | 11/15/2004 |
