长江原水聚集常数和破碎常数探究

Research on aggregation constants and breakup constants of flocculation

欧格曼-考夫曼絮凝模型是反映絮凝的有效工具,但是其中的聚集常数ka和破碎常数kb较难确定。本文使用长江原水和聚合氯化铝(PAC)进行絮凝实验,并在沉淀15min、30min、45min、60min时检测浊度,并计算得出ka、kb。研究表明反应后水沉淀时间宜为30min,聚集常数随原水浊度的增加而变大,破碎常数随浊度变大而减小。对于长江原水和PAC进行的絮凝反应,聚集常数处于10-3数量级,破碎常数处于10-7数量级。

Argaman-kaufman flocculation model is an very effective tool,but the aggregation constants and breakup constants is hard to determine.This experiement does lots of jar test with PAC on raw water,and measure turbidity under four settling times:15min 30min 45min 60min.The results indicates the optimal settling time is 30min,the aggregation constants is increasing with the initial turbidity and the breakup constants on the contrary.To the water form yangze river dosed with coagulant PAC,the aggregation constants is in the magnitude of 10-3,and the breakup constants is in the magnitude of 10-7(s).