A 2010 article in Science magazine described “Sewage Treatment with Anammox.” [B. Kartal, J. G. Kuenen, and M. C. M. van Loosdrecht, Science, Vol. 328, pp. 702-703, 2010.] The authors noted that “Fixed nitrogen such as ammonium and nitrate [ions] must be removed [from sewage] to avoid toxic algal blooms in the environment.” One approach to removing ammonium ions is to use ammonium-oxidizing (anammox) bacteria. Two (unbalanced) reactions that are involved are:

Balance these two equations in acid solution.

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NH₂+ (aq) + NO₂ (aq) → N₂(g) + H₂O(l) NH,+(aq) + Oz(g) NO₂ (aq) + H₂O(l)