Effects of nitrite inhibition on anaerobic ammonium oxidation |
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Authors: | Yuya Kimura Kazuichi Isaka Futaba Kazama Tatsuo Sumino |
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Institution: | (1) Hitachi Plant Technologies, Ltd., 537 Kami-Hongo, Matsudo Chiba, 271-0064, Japan;(2) University of Yamanashi, 4-3-11 Takeda, Kofu Yamanashi, 400-8511, Japan |
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Abstract: | In order to assess the stability of nitrogen removal systems utilizing anaerobic ammonium oxidation (anammox), it is necessary
to study the toxic effects of nitrite on these biochemical reactions. In this study, the effects of nitrite on anammox bacteria
entrapped in gel carriers were investigated using batch and continuous feeding tests. The results showed that the nitrite
concentration in a reactor must be less than 274-mg N/L in order to prevent a decrease in the anammox activity, which occurred
when the gel carriers were soaked in nitrite solutions with concentrations greater than 274-mg N/L in a batch test. In a continuous
feeding test, nitrite inhibition was not observed at low concentrations of nitrite. However, the anammox activity decreased
to 10% when the nitrite concentration increased to 750-mg N/L over a 7-day period in the reactor. In addition, it was shown
that the effects of nitrogen on the anammox reaction were reversible because the anammox activity completely recovered within
3 days when the influent nitrite concentration was decreased to less than 274-mg N/L. |
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