The nitrogen removal in the aerobic granular sludge sequential batch reactor (AGS-SBR) can be achieved by the simultaneous nitrification and denitrification (SND) mode, or by the separated nitrification and denitrification stages. The SND offers a simpler operation structure than the separated nitrification and denitrification. Based on the mathematical simulation, a novel control strategy was put forward to adjust the DO (dissolved oxygen) concentration to achieve the SND under dynamic fluctuated influent conditions in AGS-SBR. The control strategy aimed to achieve a small accumulation of NH4+ at the end of the aeration cycle (NH4+ setpoint value), as previous research has indicated that keeping the small NH4+ setpoint value would guarantee the optimal condition for total nitrogen (TN) removal. The SBR aeration cycle was divided into several equal control intervals. The DO was adjusted in every control interval to reach the NH4+ set point. The results revealed that the control strategy was able to maintain the NH4+ setpoint value and achieve satisfactory TN removal. The control interval should be less than 30 min to prevent deviation of NH4+ concentration from its setpoint value. A minimum aeration duration of 3 h was required to achieve satisfactory SND.

中文翻译：

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一种新型前馈控制策略，用于好氧颗粒污泥顺序分批反应器（AGS-SBR）中的同时硝化和反硝化（SND）。

好氧颗粒污泥顺序分批反应器（AGS-SBR）中的氮去除可通过同时硝化和反硝化（SND）模式或分离的硝化和反硝化阶段实现。与分离的硝化和反硝化作用相比，SND的操作结构更简单。在数学模拟的基础上，提出了一种新的控制策略，即在动态波动的进水条件下，调节溶解氧的溶解氧浓度，以达到SND。该控制策略旨在在曝气循环结束时实现少量的NH4 +累积（NH4 +设定值），因为先前的研究表明，保持较小的NH4 +设定值将确保最佳的总氮（TN）去除条件。SBR曝气循环分为几个相等的控制间隔。在每个控制间隔内调整溶解氧以达到NH4 +设定点。结果表明，该控制策略能够保持NH4 +设定值并实现令人满意的TN去除。控制间隔应小于30分钟，以防止NH4 +浓度偏离其设定值。为了获得满意的SND，需要最少3 h的充气时间。