三池交替工艺的污泥分布规律研究

Research on Sludge Distribution Rule of Three Tank Alternating System

三池交替工艺的污泥分布特性是由其独特的运行方式决定的。通过分析建立了三池交替工艺的污泥推流模型,根据该模型能掌握任一时间的污泥分布状况。在系统的周期运转过程中污泥分布最终会达到稳定状态,并具有周期重现性,边池的平均污泥浓度远高于中间池。模型算例表明,排泥对污泥分布影响甚微,延长主体段时间或者缩短过渡段和沉淀段时间均可以明显改善污泥分布的不均匀性;在计算污泥负荷和排泥量时需采用反应有效系数加以修正。

Sludge distribution characteristics of the three tank alternating system are determined by its distinct operating mode. The plug flow model of sludge distribution in the three tank alternating system was set up for controlling the sludge distribution status at one time. During systematic periodical operations, sludge distribution will eventually attain settlement at a stable state with periodic recurrences. The average sludge concentration of side tank is much higher than that of the middle tank. The model results demonstrate that sludge discharge can hardly affect sludge distribution. However, the asymmetry problem of sludge distribution can be overcome by either prolonging main phase time or shortening transition phase and settlement phase time. Calculating the sludge load and sludge discharge quantity requires the modification by the valid reaction coefficient. Overall, this model provides precise simulation of sludge distribution in real process.