Use of ozonation for water treatment leads to the formation of a wide variety of
byproducts due to the reaction of ozone with constituents of water, such as bromide and
natural organic matter. Identification and quantification of these byproducts are important
for several reasons that include: the byproducts readily serve as a source of nourishment for
biological regrowth in the distribution system; the byproducts may pose a health
concern for consumers; and, the byproducts can serve as precursors to other byproducts
through reactions with water constituents or water treatment chemicals.
The Philadelphia Water Department (PWD) has made use of EPA Method 556
since 1999 to identify and quantify aldehyde ozonation byproducts formed at PWD's two
ozone pilot plants. The use of Method 556 has led to various discoveries that will prove
useful to laboratories that analyze drinking water. Examples of discoveries are the
insolubility of analytes in method solvents, sources of contamination, and method
calibration challenges. In order for the method to be used to analyze large sample
batches, this required modifying the method beyond its original stated capabilities. In
addition, the ozone pilot plant water matrix posed unique challenges that required extra
work such as preservative modification. This paper discusses how PWD
overcame method problems, utilized large sample volumes, and assayed complex water
matrices. Information on the long-term performance of the method is also given.
Includes 11 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 280 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 11/01/2002 |
