Secondary effects of anion exchange on chloride, sulfate, and lead release: Systems approach to corrosion control

Hillary Willison, Treavor Boyer

Research output: Contribution to journalArticle

20 Scopus citations

Abstract

Water treatment processes can cause secondary changes in water chemistry that alter finished water quality including chloride, sulfate, natural organic matter (NOM), and metal release. Hence, the goal of this research was to provide an improved understanding of the chloride-to-sulfate mass ratio (CSMR) with regards to chloride and sulfate variations at full-scale water treatment plants and corrosion potential under simulated premise plumbing conditions. Laboratory corrosion studies were conducted using Pb-Sn solder/Cu tubing galvanic cells exposed to model waters with low (approx. 5 mg/L Cl - and 10 mg/L SO 4 2-) and high (approx. 50 mg/L Cl - and 100 mg/L SO 4 2-) concentrations of chloride and sulfate at a constant CSMR of ∼0.5. The role of NOM during corrosion was also evaluated by changing the type of organic material. In addition, full-scale sampling was conducted to quantify the raw water variability of chloride, sulfate, and NOM concentrations and the changes to these parameters from magnetic ion exchange treatment. Test conditions with higher concentrations of chloride and sulfate released significantly more lead than the lower chloride and sulfate test waters. In addition, the source of NOM was a key factor in the amount of lead released with the model organic compounds yielding significantly less lead release than aquatic NOM.

Original languageEnglish (US)
Pages (from-to)2385-2394
Number of pages10
JournalWater Research
Volume46
Issue number7
DOIs
StatePublished - May 1 2012
Externally publishedYes

    Fingerprint

Keywords

  • Chloride-to-sulfate mass ratio
  • Copper
  • Lead
  • Magnetic ion exchange
  • Natural organic matter

ASJC Scopus subject areas

  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution
  • Ecological Modeling

Cite this