Journal
WATER ENVIRONMENT RESEARCH
Volume 82, Issue 7, Pages 648-656Publisher
WATER ENVIRONMENT FEDERATION
DOI: 10.2175/106143010X12609736966360
Keywords
nitrite reduction; zinc; kinetic parameters; mass transfer
Funding
- Perrinots SCA of Marmande (France)
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Heterogeneous chemical reactions are complicated, especially in the case of competitive reactions. The aim of this study was to investigate the elimination of nitrite (NO(2)(-)) by applying a metallic reduction using zero-valent zinc (Zn(0)). The effect of pH, stirring, and metal shape (powder and chips) on the rate and products of nitrite reduction were studied in a batch-stirred reactor. The obtained data have been used to optimize the conditions for metallic reduction of NO(2)(-) and for kinetic parameters identification. It was found that the dissolution of zinc involves a pseudo-first-order reaction independent of the shape of the metal. Further, the influence of operating conditions on nitrogen (N(2)) and ammonium (NH(4)(+)) formation has been determined. It was found that a decrease in pH and in the Zn(0) content enhances NH(4)(+) production. If kinetic parameters can be approximated easily for constant surface area, it was demonstrated that surface evolution had to be integrated for metal powder. Finally, a numerical simulation has been used to determine the kinetic parameters for NO(2)(-) reduction with zinc powder. Water Environ. Res., 82, 648 (2010).
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