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Science and Technology of Energetic Materials

Vol.71, No.1 (2010)

Research paper

Decomposition of aqueous nitrate ion by bamboo chips
Youichi Sano, Toshiyuki Nagaishi, Katsutoshi Hayashida, Kazumasa Hayashida,
and Kiyomi Nishihara
p.1-7

Abstract

Nitrate ion is the one of the cause of water pollution in enclosed bodies of water. In this report, the investigation on the denitration of nitrate ion containing aqueous solution was carried out with biological treatment using bamboo chips. The obtained results are as follows. Finally, aqueous nitrate ion which formed nitrite ion intermediately in the course of the reaction, was completely degraded to nitrogen gas by catalytic reaction of bamboo chips. The maximum amount of nitrite ion formation reached approximately to the amount of 50% of initial nitrate ion. Lineweaver-Burk plots showed a strait line for this reduction, and it was well described by Michaels-Menten model. From these results, it is concluded that aqueous nitrate ion can be decomposed to nitrogen gas by denitrifying bacteria in bamboo chips based on the following reaction.
  NO3-+H2→NO2-+H2O......................................................(1)
  NO2-+3/2H2→1/2N2+H2O+OH-....................................(2)
  NO3-+5/2H2→1/2N2+2H2O+OH-..................................(3)
Waste water which obtained from catalytic decomposition of trinitrophenol contains nitrate ion. This nitrate ion was also finally denitrified to nitrogen gas, and the amount of producing nitrite ion was 50% of that of initial nitrate.

Keywords

bamboo, nitrate ion, enzyme, trinitrophenol, denitrifying bacteria.

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