【摘要】 利用锥形流化床混凝工艺中固相颗粒的流化运动在液相中形成的微涡流,使液相中的胶体颗粒碰撞和聚集,形成絮体。结果表明在论文研究范围内,高岭土悬浊液去除率(23.97%～85.37%)随GT(1836.51～5399.53)增加而提高。G值的减小(169.2～189.7s-1)和混凝时间增加都会引起混凝效率的升高。采用分形维数模型计算得到,相同运行条件下形成絮体的分形维数相关系数均在0.9以上,表明絮体性质具有相似性,因此相同操作条件下絮体自由沉降速度区间分布狭窄,相同沉速的颗粒数量百分比峰值达45%。更多还原

【Abstract】 Micro-vortex in liquid phase of conical fluidized-bed flocculation reactor,caused by fluidizing solid particles,was utilized to make colloids collision and aggregation,which results in the formation of flocs.When the value of GT increased from 1836.51 to 5399.53,the removal fraction (RF) of kaolin clay suspension increased from 23.97% to 85.37%.Also,The RF increased with the decreasing of G and the increasing of T,when G was within 169.2—189.7 s-1.According to the Fractal Dimension model,the correlation coefficient of flocs was above 0.9 at the similar operation conditions of reactor.This indicated the similarity of the flocs properties,which led to a narrow distribution of free falling velocity,and the maximum value of amount of flocs particles with the same falling velocity was up to 45%.更多还原