机械搅拌用于水处理中混凝过程的研究  

APPLICATIONS OF MECHANICAL AGITATION IN WATER FLOCCULATION TREATMENT

作　　者：包雨云[1] 黄雄斌[1] 施力田[1] 王英琛[1] 

机构地区：[1]北京化工大学化学工程学院,北京100029

出　　处：《水处理技术》2003年第1期28-31,共4页Technology of Water Treatment

摘　　要：以机械搅拌用于水处理中混凝过程为研究对象 ,在 0 .75 m× 0 .75 m× 1 m方形搅拌槽中 ,利用配制的两种污水 ,以 Al2 ( SO4 ) 3· 1 8H2 O为絮凝剂 ,采用三种不同直径的轴流式 CBY型搅拌桨 ,分别得出适用于快速混合过程及絮凝过程的机械搅拌操作参数 :( 1 )对于快速混合过程 ,搅拌桨直径增加 ,絮凝剂混匀所需输入功率增大 ;( 2 )对于三级絮凝过程 ,三级絮凝搅拌桨叶端线速度之比为3∶ 2∶ 1 ,第一级叶端线速度的适宜范围为 :1 .5～ 1 .8m/s;输入功率相同时 ,不同直径搅拌桨的絮凝效果相当 ;对于 CBY型搅拌桨 ,离底距离对絮凝效果影响不大。Water flocculation treatment experiments under different operational conditions are carried out in a square stirred tank(0.75m×0.75m×1m) with three propellers in different diameters. The suitable parameters of mechanical agitation for water flocculation treatment are determined as follows:(1)Power input increases as the diameter of propeller is increased for fast mixing process. (2)The tip velocity of propeller for the first stage flocculation should be in the range of 1.5～1.8m/s. Results of flocculation treatment using propellers in different diameters are similar when the power inputs are kept same. The distance of the CBY propeller from the bottom of the tank has no considerable influence on the results of flocculation treatment.

关 键 词：机械搅拌 混凝过程 快速混合 絮凝 机械搅拌 水处理 

分 类 号：X143[环境科学与工程—环境科学]