This powerpoint presentation begins by presenting study objectives: Lead and Copper Rule 2007 Amendments
require advanced notification and approval
for "water systems that intend to make any
long-term change in water treatment"; many factors impact
corrosivity, including corrosion inhibitor
type and dose, pH, alkalinity, and hardness; consequently, long-term changes in several
of these parameters have been evaluated for
North Carolina (NC) utilities to allow for process changes. Long-term changes studied and why: switching from alum to ferric sulfate for disinfection byproduct (DBP)
control in Winston-Salem; switching from caustic to liquid lime in
Raleigh for cost savings; impact of switching chloramines to chlorine
annually; and, to verify desired ranges of water quality
parameters for lead and copper corrosion
control. Bench testing conditions and results are presented for both Winston-Salem and Raleigh. Study conclusions indicate that: many factors impact corrosion control; for the specific waters tested, a change from
alum to ferric sulfate in one case, and from
caustic to liquid lime for the other, did not
appear problematic for lead and copper
corrosion given the recommended
conditions for corrosion inhibitor and pH; and, bench-testing is very useful in evaluating
long-term changes that can arise from site-specific
water qualities to avoid unintended
consequences. Includes table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.2 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 24 |
| Published : | 11/01/2009 |
