Carlsson B, Rehnström A
Department of Systems and Control, Uppsala University, Sweden.
Water Sci Technol. 2002;45(4-5):135-42.
In this paper, a simulation benchmark of a predenitrifying activated sludge process is used to evaluate a number of control strategies. A main procedure has been to use feedforward terms that are based on simplified physical models. Important mass balance relations may then be incorporated in the control law. The nitrate level in the last anoxic zone is controlled by the dosage of an external carbon source and the nitrate level in the last aerobic zone is controlled by the internal recirculation flow rate. The ammonia level is controlled by a DO set-point controller. In order to be able to have as high a sludge level as possible without sludge escape, the sludge blanket height in the settler is controlled by the excess sludge flow rate. Compared to the default set up of the benchmark, the controllers could reduce the effluent nitrate significantly whereas the effluent ammonia was only marginally decreased. The main problem is that the aeration capacity defined in the benchmark is too low.
在本文中，采用前置反硝化活性污泥工艺的模拟基准来评估多种控制策略。主要步骤是使用基于简化物理模型的前馈项。然后可将重要的质量平衡关系纳入控制律。最后一个缺氧区的硝酸盐水平由外部碳源的投加量控制，最后一个好氧区的硝酸盐水平由内回流流量控制。氨氮水平由溶解氧设定点控制器控制。为了在不发生污泥流失的情况下尽可能提高污泥水平，沉淀池中的污泥层高度由剩余污泥流量控制。与基准的默认设置相比，控制器可显著降低出水硝酸盐含量，而出水氨氮仅略有下降。主要问题是基准中定义的曝气能力过低。
