Bacterial regrowth and formation of disinfection
byproducts (DBPs) in distribution systems are issues
of concern for many drinking water utilities. Yet, the
traditional methods for determining microorganisms
in water distribution systems can greatly underestimate
the actual number of organisms.
Using several newer methods for quantifying
microorganisms and related parameters, the authors
examined bacterial growth in two chloraminated
distribution systems. They found that although intermittent
addition of free chlorine reduced microorganism
counts, the counts begin to increase upon switching
back to chloramines. Periodic flushing, however,
can avoid formation of DBPs, especially at locations
that experience sporadic water use and at "dead-end"
points in a distribution system's piping. This study
relates the importance of examining unique issues in
drinking water distribution systems - such as long
detention times, sporadic use, and dead-end piping
situations - and the importance of creating better
flushing protocols that would contribute to better
water quality at the tap. Includes 30 references, tables, figures.
| Edition : | Vol. 101 - No. 10 |
| Number of Pages : | 11 |
| Published : | 10/01/2009 |
