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Consumption of ammonium (●) and nitrite (■) (shown as negative values), and production of nitrate (□) by the anammox process in 50-h fed-batch experiments. (A) Nitrite concentration = 0; (B) nitrite concentration = 0.06 g of nitrogen per liter; (C) nitrite concentration = 0.09 g of nitrogen per liter; (D) nitrite concentration = 0.2 g of nitrogen per liter (ammonium production after 10 h).
