AWWA WQTC69493

Potassium ferrate (K₂FeO₄, Fe(VI)), a powerful and environmentally friendly oxidizingagent, is attracting growing attention as an emerging water treatment chemical. This studyreports on recent work examining the effectiveness of Fe(VI) for oxidation ofpharmaceutically active compounds (PhACs) and inactivation of viral pathogens (surrogatepathogen: coliphage MS2) during water treatment. Twelve PhACs from representativecompound classes were screened to assess potential reactivity with Fe(VI) on timescales ofinterest to water utilities. Eight of the 12 PhACs surveyed, including the antiepileptic drugcarbamazepine and phenolic endocrine disruptor compounds (EDCs), were found to havemoderate to high reactivity with Fe(VI). Results also show that Fe(VI) is an effectivedisinfectant for MS2 phage. The CT value for 99% inactivation of MS2 is ~2 mg-min L-1 asFe at pH 7 and 25 ºC. Both rates of PhAC oxidation and virus inactivation are highlydependent upon solution pH, increasing with decreasing pH as Fe(VI) speciation shiftstowards more reactive protonated species (HFeO₄^- and H₂FeO₄). Kinetic models that considerchanging speciation of both Fe(VI) and the reacting PhAC or virus, illustrated for the case ofcarbamazepine, were developed to account for pH-dependent reactivity trends. Includes 25 references, table, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

8

File Size:

1 file , 900 KB