Enhanced chlorine dioxide decay in the presence of metal oxides in drinking water distribution systems

Liu, C.; Von Gunten, U.; Croue, Jean-Philippe

Access Status

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Authors

Liu, C.

Von Gunten, U.

Croue, Jean-Philippe

Date

2013

Type

Conference Paper

Metadata

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Citation

Liu, C. and Von Gunten, U. and Croué, J. 2013. Enhanced chlorine dioxide decay in the presence of metal oxides: Relevance to drinking water distribution systems, in Proceedings of the Water Quality Technology Conference and Exposition, Nov 3–7 2013. Long Beach, California: American Water Works Association.

Source Title

2013 Water Quality Technology Conference and Exposition, WQTC 2013

School

Curtin Water Quality Research Centre

URI

http://hdl.handle.net/20.500.11937/53646

Collection

Curtin Research Publications

Abstract

The present study focused on enhanced chlorine dioxide (ClO2) decay in the presence of metal oxides formed in drinking water distribution systems due to metal pipe corrosion phenomena. Chlorine dioxide decays via three pathways: 1) catalytic disproportionation which produces equal molar amounts of chlorite and chlorate, 2) the decay to chlorite and oxygen and 3) oxidation of metals to a higher oxidation state. Cupric oxide (CuO) and nickel oxide (NiO) showed significantly stronger ability to catalyze the ClO2 disproportionation than goethite (a-FeOOH). CuO and NiO also enhanced ClO2 decay to produce chlorite and oxygen. Chlorine dioxide can oxidize cuprous oxide (Cu2O) to CuO, with the release of chlorite. The interaction between metal oxides and chlorine dioxide will raise an issue on how to maintain oxidant residual in drinking water distribution systems.