AWWA WQTC60618

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 wasused in conjunction with the existing 16 MGD lime softening treatment units and filtersfor potable water treatment. A side stream is removed from the existing lime softeningtreated water and passed through a 6 MGD ion exchange treatment unit to remove TotalOrganic Carbon (TOC) and color, thereby reducing DBP formation potential in thefinished water. The existing lime softening equipment and the existing wells were ingood condition and produced acceptable water but higher quality water was desired. TheCity compared various options such as anion exchange, membrane softening, reverseosmosis(using a saline water source) and ozone. It was determined that the most costeffective method for improving the water quality was the anion exchange system. It wasalso determined that this system was very efficient with respect to generating wastewaterflows. Less than 1% of the water treated is sent to waste disposal verses approximately15% for a comparable membrane treatment system. Essentially all the color is strippedfrom this side stream. Removal of these precursors reduced total trihalomethane (TTHM)formation during disinfection with chloramines and allows the plant to meet current andmost 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.

Product Details

Edition:

Vol. - No.

Published:

11/15/2004

Number of Pages:

6

File Size:

1 file , 310 KB