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| Biological advanced nitrogen removal from landfill leachate of high concentration nitrogen by anoxic/anaerobic UASB-sequencing batch reactor (SBR) at low temperature. |
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Abstract The treatment of real leachate from municipal landfill with high chemical oxygen demand(COD) and ammonia nitrogen(NH4+-N) content was investigated by using lab-scale anoxic/anaerobic up-flow anaerobic sludge bed (UASB)-sequencing batch reactor (SBR) combined process. COD and nitrogen effectively was removed simultaneously and effectively by the biological system, average COD and NH4+-N of influent could be reduced from 11950.2mg/L and 982.7mg/L to 390.1mg/L and 2.9mg/L, respectively. The maximum organic loading rate of anoxic UASB reactor reached 13 kg/(m3·d), and the maximum organic removal rate was 12.39 kg/(m3·d). Denitrification efficiency in the anoxic phase of SBR and in the anoxic UASB was above 99%. Under the lower water temperature conditions at 14.9, 14.1, 13.5 and 11.05 ℃ in winter, complete nitrification and denitrification was achieved in SBR reactor, the effluent TN was below 16.5mg/L. In addition, it was also indicated the influence of temperature was greater for denitrification rate (rDN) than for nitrification rate(rN), however, the rN/rDN ratio was relatively constant in a certain temperature range.
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Received: 15 July 2008
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