应用二沉池污泥层高度控制A/O工艺污泥回流量

Applying the sludge blanket height in the secondary clarifier to control sludge recycle flow rate of A/O process

鉴于城市污水处理厂每日、每小时的进水量波动性很大,采用传统的恒定污泥回流比或固定污泥回流量控制会引起二沉池出现巨大的水力波动,从而影响系统处理效果.以二沉池污泥层高度作为控制变量,建立了回流污泥控制策略和控制器.采用A/O工艺中试试验装置,在处理实际生活污水的情况下,对所建立的控制器进行了验证,结果表明,与传统恒定污泥回流比控制相比,TN去除率可以提高10%,污泥回流量可以降低20%,且可以维持系统稳定运行.

In view of the great fluctuation of inflow rate of urban wastewater treatment plant, adopting the traditional constant sludge recycle ratio or sludge recycle flow rate control more dangerous, which may cause significantly hydraulic fluctuation in the secondary clarifier, thus influencing the system removal efficiency. Using sludge blanket height as control parameter, the control strategy and controller of sludge recycle were established, and verified in a pilot-scale A/O biological nitrogen removal plant treating actual domestic wastewater. Compared with the traditional constant sludge recycle ratio control, TN removal rate could enhance 10%, sludge recycle flow rate could lower 20%, and could maintain the system stable operation.