AWWA ACE63080

This research examined the removal of perchlorate from drinking and groundwater with an innovative method using titanium metal as a chemical reductant. The zerovalent titanium was induced by pitting corrosion to remove the surface oxide film byapplying electrochemical potential. Localized breakdown of the surface oxide film by thepitting corrosion exposed the underlying bare titanium and perchlorate was reduced toinnocuous chloride by the bare titanium. The rate of perchlorate reduction was highlydependent on the applied current. One-half of reaction time to reduce 1 mM ofperchlorate was 1.5 hrs when 200 mA of constant current was supplied during thereaction. Mass balances revealed that oxidation was also developed on the surface oxidefilm, where the pitting corrosion did not exist. The titanium system effectively destroyedboth mg/L and µg/L levels of perchlorate and achieved below 24.5 µg/L of the DWEL. Includes 15 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

5

File Size:

1 file , 290 KB