Application of a partial nitritation and anammox system for the old landfill leachate treatment

This study shows high nitrogen removal efficiency of a combination of partial nitritation and Anaerobic Ammonium Oxidation (anammox) process for old landfill leachate treatment. A lab-scale experiment including partial nitritation using a sequencing batch reactor (PN-SBR) followed by a anammox hybrid reactor (HAR), which consists of suspended biomass layer in the bottom part and bio-carrier bed in the upper part run at the influent total ammonia concentrations (TAN) of 500 mg NIL and 1000 mg N/L The result of PN-SBR experiment showed that the NO2-N:NH4-N ratio achieved about 1.22 and 1.02 at HRT of 12 h (influent TAN of 500 mg N/L) and HRT of 19 h (influent TAN of 1000 mg N/L), respectively. Simultaneously, the HAR was operated at the nitrogen loading rate (NLR) of 4.2 and 83 kg N/m(3).d, corresponding to influent TAN of 500 mg N/L and 1000 mg N/L, respectively. The effluent of the system containing 9.7 +/- 3.5 mg NH4-N/L, 1.7 +/- 0.4 mg NO2-N/L and 23 +/- 4 mg NO3-N/L (equivalent to 35 +/- 4 mg TN/L) at NLR of 1.02 for PN-SBR and NLR of 4.2 kg N/m(3).d for BAR. This effluent quality was good enough to meet Vietnamese treated landfill leachate quality. The system obtained TN removals of 93 +/- 1% and 81 +/- 1.2% at NLRs of 4.2 kg TN/m(3).d (phase I) and 8.3 kg TN/m(3).d (phase II), respectively. The total biomass of BAR including attached biomass and suspended one was maintained up to 20,400 mgVSS/L at the end of the experiment when the removal rate of anamnox biomass obtained 0.4 kg TN/kgVSS.d. While, PN-SBR was kept at 2300 mg MLVSS/L and SRT of 10-12 days at NLR of 4.2 kg TN/m(3).d, which the nitrogen conversion rate of AOB was 0.53 kg TAN/kgVSS.d. In terms of COD removal, it is found that PN-SBR removed only 14% of influent COD, whereas BAR removed 30% of COD. (C) 2014 Published by Elsevier Ltd.