The Intermittent Denitrification or Intermittently Aerated Completely Mixed process is a process for obtaining biological N removal by rapidly cycling the same reactor between aerobic and anoxic conditions. A full-scale trial of the process was carried out in a three stage activated sludge plant fed oil refinery wastewater at the Shell Godorf Refinery near Koln, Germany. The wastewater contained a COD content between 400 - 1000 mg O/l and an ammonia content between 100 - 200 mg N/l. High N removal efficiencies of at least 85% (at loadings of up to 300 g N/m~3.d) occurred in the biotreater first stage and 94% for the whole biotreater. The process was optimised by balancing the COD requirement for denitrification to the N load by the addition of methanol during the anoxic phase. Overdosing of COD resulted in N removal proceeding via NO_2~- rather than NO_3~- indicating NO_2~- oxidation was impaired.
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机译：间歇反硝化或间歇性充气的完全混合方法是通过在有氧和缺氧条件之间快速循环相同的反应器获得生物n去除的方法。该过程的全规模试验是在德国Koln附近的壳体Godorf炼油厂喂油炼油厂喂油炼油厂的三级激活污泥厂。废水含有400-1000mg O / L的COD含量和100-200mg N / L之间的氨含量。在生物注册器第一阶段发生高N去除效率至少85％（在高达300g N / m〜3.D的载荷上），整个生物设备的94％。通过在缺氧相期间通过加入甲醇来平衡对N负载的COD要求进行优化来优化该方法。过量的鳕鱼导致通过NO_2〜 - 而不是NO_3〜 - 表示NO_2〜 - 氧化受到损害。
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