Full Description

This powerpoint presentation begins by presenting study objectives: Lead and Copper Rule 2007 Amendmentsrequire advanced notification and approvalfor "water systems that intend to make anylong-term change in water treatment"; many factors impactcorrosivity, including corrosion inhibitortype and dose, pH, alkalinity, and hardness; consequently, long-term changes in severalof these parameters have been evaluated forNorth 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 inRaleigh for cost savings; impact of switching chloramines to chlorineannually; and, to verify desired ranges of water qualityparameters for lead and copper corrosioncontrol. 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 fromalum to ferric sulfate in one case, and fromcaustic to liquid lime for the other, did notappear problematic for lead and coppercorrosion given the recommendedconditions for corrosion inhibitor and pH; and, bench-testing is very useful in evaluatinglong-term changes that can arise from site-specificwater qualities to avoid unintendedconsequences. Includes table, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 24File Size: 1 file , 1.2 MB