城镇污水厂污泥浓缩脱水的优化控制研究

Optimizing Control of Sludge Thickening and Dewatering Process in Municipal Sewage Factory

污泥浓缩脱水是城镇污水厂节能降耗的一个重要环节,提高剩余污泥浓度并优化污泥絮凝剂投加量利于污泥的浓缩脱水。在维持曝气区污泥浓度稳定的工艺控制中,根据日常污泥沉降比试验,确定沉淀区最大污泥浓度,再通过物料衡算及沉淀区池面观察情况与出水SS,确定最小污泥回流比,以获得最大的回流污泥浓度,改善污泥的浓缩脱水。通过试验确定不同污泥浓度下PAM高分子絮凝剂的最佳投配率,以控制絮凝剂的动态投加,优化污泥浓缩脱水过程中的絮凝剂投加量,达到节能降耗的目的。

Sludge thickening dewatering is one important part of energy saving and consumption reducing of municipal sewage factories. It will increase the concentration of sludge residuals and improve the effectiveness flocculants. In keeping a stable sludge concentration of aerated zone,the highest sludge concentration of setting zone was obtained based on daily experiment about SV30,and then the lowest sludge reflux ratio was determined via material balance and the observation of surface of setting zone and effluent SS in order to achieve the highest returned sludge concentration and improve sludge thickening dewatering. The optimal dosage ratio of PAM for different sludge concentration was obtained by experiment to add flocculants dynamically,optimize the dosage and achieve energy saving and consumption reducing.