Özet:

This study aims at investigating the sequential denitrification and the partial nitrification performance of anoxic moving bed reactor (AnoxMBBR)-aerobic sequencing batch reactor (AeSBR) to remove ammonium-nitrogen from landfill leachate (LFL). For this purpose, AnoxMBBR and AeSBR were set-up and operated at a cycle time of 48-h. The both reactor performances were evaluated by chemical oxygen demand (COD), dissolved organic carbon (DOC), inorganic carbon (IC), ammonium (NH4 +), nitrite (NO2 -), nitrate (NO3 -), total nitrogen (TN), color (Pt-Co and RES) and pH parameters. Additionally, the AeSBR performance was evaluated in terms of free ammonium (FA) and free nitrous acid (FNA) concentrations. In the sequential system, total removal efficiency of COD and ammonium was about 75% and 65%, respectively. In AnoxMBBR, also, NO3 - removal efficiency was about 55%. The partial nitrification was successfully occurred in AeSBR and the nitrite accumulation at 24-h and 48-h was about 1630.16 and 1702.92 mg/L, respectively. The results of this study suggest that use of sequential denitrification/partial nitrification is an effective way to remove COD and ammonium from raw LFL However, additional treatment methods to this sequential system can be applied as pretreatment and/or post treatment for achieving the desired water quality because effluent TN and COD values are still not meet with the discharge standards of 40 mg N/L and 600 mg COD/L.

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