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The partial nitrification reactor was successfully started up and operated stably for more than 250days with a maximum nitrite production rate of 1.12kg-Nm −3 day −1 . The important factors for successful partial nitrification were high ammonium loading rate (>1.0kg-Nm −3 day −1 ) and relatively high pH (ca. 8.0), giving high free ammonia concentrations (>10mg...
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