The Idyllwild Water District (IWD) and
Pine Cove Water District (PCWD) are
small California groundwater systems
drawing from soft, mildly acidic
source waters with high carbon dioxide content
and dissolved inorganic carbon concentrations.
After both systems exceeded one or
both of the lead and copper action levels in
1993 and 1994, IWD and PCWD investigated
aeration as a way to increase pH and
replace inhibitor or other chemical additions.
Following pilot-testing, full-scale deep
bubble aeration systems went online in both
water districts in October 1998. By January
1999, IWD and PCWD easily met the lead
and copper action levels. In addition, radon
(Rn) samples from PCWD showed a 99%
reduction in Rn levels, ensuring compliance
with upcoming Rn regulation. Furthermore,
the use of aeration for corrosion control
simplified treatment and improved water
quality in most respects.
When source water chemistry is appropriate,
aeration treatment offers a simple and
inexpensive substitute for chemical dosing
for corrosion control of lead and copper.
Many smaller water systems struggle with
operating chemical feed systems and selecting
chemical dosages for phosphate corrosion
inhibitors. For a modest initial capital investment
and with good planning, water systems
with the appropriate chemistry can use aeration
to take the place of chemical dosing for
corrosion control while removing Rn beyond
any regulatory proposals. The end result is
cost-effective, operator-friendly treatment
that can simultaneously resolve other potential
water quality issues. Includes 33 references, tables, figures.
| Edition : | Vol. 94 - No. 3 |
| File Size : | 1
file
, 1.8 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 03/01/2002 |
