Anti-shock loading capability of a fluidized-bed flocculator

The efficiency of a fluidized-bed flocculator with 800-um particles of 1360 kg/m3 in density was studied, and the anti-shock capability of the unit was estimated for three kinds of industrial wastewater： heavy turbidity wastewater, dispersed dyeing wastewater and starch wastewater. Steady removal efficiency was contributed by the following characteristics of the flocculator： （1） the dynamic conditions, flocculation time and velocity gradient, which were stabilized at a steady level as the loading rate changed; （2） hydrodynamic characteristics, especially the considerable rise of expanded bed height with increasing superficial velocity when small and light particles were employed as the solid phase; （3） flocs growth characteristics in the fluidized bed, which caused the density and size of the flocs being maintained at a compensational relationship, resulted the stabilized settling velocity of the flocs.

造粒流化床浓缩技术处理给水厂排泥水的中试研究

以南方某给水厂排泥水为处理对象,利用造粒流化床污泥浓缩工艺进行了处理规模为 1-2．5 m3／h的中试研究。研究结果表明,对于排泥水有机物、藻类含量高的南方水厂而言,采用一 体化造粒流化床浓缩工艺进行处理是切实可行的,且具有处理效率高、出泥含水率低、脱水性能好、 出水浊度低等特点;中试条件下,流化床水流上升速度可达38-50 cm／min,最佳搅拌转速为 5 r／min,PAM药耗比普通重力浓缩-调质工艺节省25％-40％,污泥含水率可从99％降至95％- 97％。并通过试验确定了相关工艺参数。