Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China.
J Environ Sci (China). 2009;21(11):1480-5. doi: 10.1016/s1001-0742(08)62443-2.
A system consisting of a two-stage up-flow anaerobic sludge blanket (UASB), an anoxic/aerobic (A/O) reactor and a sequencing batch reactor (SBR), was used to treat landfill leachate. During operation, denitrification and methanogenesis took place simultaneously in the first stage UASB, and the effluent chemical oxygen demand (COD) was further removed in the second stage UASB. Then the denitrification of nitrite and nitrate in the returned sludge by using the residual COD was accomplished in the A/O reactor, and ammonia was removed via nitrite in it. Last but not least, the residual ammonia was removed in SBR as well as nitrite and nitrate which were produced by nitrification. The results over 120 d (60 d for phase I and 60 d for phase II) were as follows: when the total nitrogen (TN) concentration of influent leachate was about 2500 mg/L and the ammonia nitrogen concentration was about 2000 mg/L, the short-cut nitrification with 85%-90% nitrite accumulation was achieved stably in the A/O reactor. The TN and ammonia nitrogen removal efficiencies of the system were 98% and 97%, respectively. The residual ammonia, nitrite and nitrate produced during nitrification in the A/O reactor could be washed out almost completely in SBR. The TN and ammonia nitrogen concentrations of final effluent were about 39 mg/L and 12 mg/L, respectively.
采用两段式上流式厌氧污泥床（UASB）、缺氧/好氧（A/O）反应器和序批式反应器（SBR）组成的系统处理垃圾渗滤液。运行过程中，第一阶段 UASB 中同时发生反硝化和产甲烷作用，第二阶段 UASB 进一步去除出水化学需氧量（COD）。然后，A/O 反应器中利用剩余 COD 对回流污泥中的亚硝酸盐和硝酸盐进行反硝化，同时去除氨氮。最后，SBR 中去除剩余的氨氮以及硝化产生的亚硝酸盐和硝酸盐。经过 120 天（第一阶段 60 天，第二阶段 60 天）的运行结果表明：当进水渗滤液中总氮（TN）浓度约为 2500mg/L，氨氮浓度约为 2000mg/L 时，A/O 反应器中稳定实现了 85%-90%亚硝酸盐积累的短程硝化。系统的 TN 和氨氮去除率分别达到 98%和 97%。A/O 反应器中硝化产生的剩余氨氮、亚硝酸盐和硝酸盐可在 SBR 中几乎完全被冲洗掉。最终出水的 TN 和氨氮浓度分别约为 39mg/L 和 12mg/L。
