活性污泥系统的回流污泥量控制策略

结合水力传递模型和二沉池模型，对水力负荷冲击下活性污泥系统的回流污泥量控制的三种策略(回流污泥量不变，回流污泥量随系统进水流量成比例增加，回流污泥量随进入二沉池的流量成比例变化)进行了初步分析比较。通过计算和模拟得到各构筑物的进、出水流量变化以及二沉池内各层悬浮固体浓度变化的情况。结果表明在回流污泥量不变和回流污泥量随二沉池进水流量成比例变化的策略下，系统都表现得相对稳定，尤其是后者能更好地提高二沉池的负荷承受能力，而采用回流污泥量随系统进水量变化的策略对系统的稳定较为不利。

Study on the Strategies for Control of Sludge Recycle Flow in Activated Sludge System

Three strategies are used for control of sludge recycle flow in activated sludge system under hydraulic loading shock. The first strategy is to keep sludge recycle flow unchanged; the second strategy is to have recycle flow increasing in the proportion of the system's influent flow; the third strategy is to control the variation of recycle flow with inflow to secondary clarifier in proportionality. The analysis and comparison were made for the three strategies based on hydraulic transfer and secondary clarifier models. Through calculation and simulation, we have obtained the variation both in the inflow and outflow of all structures and the suspended solids concentration in each layer of secondary clarifier. The results showed that when the first and third strategies are used, the system operates steadily, especially the third strategy results in the further improvement of load capacity of secondary clarifier; however, the use of second strategy is more unfavorable to the steady operation of the system.