高氮渗滤液缺氧/厌氧UASB-SBR工艺低温深度脱氮

在低温条件下,采用缺氧/厌氧UASB-SBR组合工艺处理实际垃圾填埋场渗滤液.结果表明,该工艺可实现有机物和氮的同步、深度去除.在进水COD平均为11950.2mg/L,NH4+-N为982.7mg/L的条件下,出水分别为390.1mg/L和2.9mg/L,去除率分别为96.7%和99.7%.同时,缺氧UASB1反应器的最大COD负荷达到13kg/(m3×d),最大COD去除速率为12.39 kg/(m3×d),具有高效缺氧反硝化和高效厌氧降解有机物反应的双重功效, 在SBR反应器的缺氧段和缺氧UASB,反应器内获得了99%以上的反硝化率.对于冬季水温分别为14.9,14.1,13.5,11.05℃的低温条件下,SBR反应器实现了完全硝化和反硝化,出水TN分别为4.1,5.7,14.1,16.5mg/L,达到了深度脱氮的目的.此外,在上述温度范围内,温度对反硝化速率(rN)的影响大于对硝化速率 (rDN)的影响, rN/rDN比值相对恒定.

Biological advanced nitrogen removal from landfill leachate of high concentration nitrogen by anoxic/anaerobic UASB-sequencing batch reactor (SBR) at low temperature

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.