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AWWA WQTC71601
- Colloidal Mobilization of PbO2 by Chloramine and NOM and Effects of Phosphate Corrosion Inhibitors
- Conference Proceeding by American Water Works Association, 11/01/2009
- Publisher: AWWA
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This paper addresses changes of lead release and colloidal mobilization from lead dioxide(PbO<sub>2</sub>) associated with the introduction of chloramine, presence of natural organic matter (NOM) and addition ofphosphate corrosion inhibitors in drinking water distribution systems. Experimental workshowed that when NOM was present, the surface potential of PbO<sub>2</sub> exhibited a prominentnegative shift and colloidal mobilization of Pb(IV) particles became prominent. The presenceof chloramine did not significantly change these effects of NOM on the colloidal behavior ofPbO<sub>2</sub>. Effects of phosphate corrosion inhibitors on colloidal lead release were examined. Itwas determined that the formation of nano particles of hydroxypyromorphite Pb<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>OH greatly decreased lead release. Includes 9 references, figures.
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