搅拌条件对混凝去除清淤尾水污染物的影响研究

Study on the Influence of Stirring Condition on the Removal of Dredging Residual Water Pollutants by Coagulation Flocculation Treatment

清淤尾水由于其沉降时间长,极大地限制了环保疏浚的发展。利用化学混凝法以聚合氯化铝(PAC)为絮凝剂、聚丙烯酰胺(PAM)为助凝剂处理清淤尾水,探究了快速搅拌阶段转速和时间、低速搅拌阶段转速和时间对化学混凝处理清淤尾水的影响。试验结果表明:当快速搅拌转速为200r/min、搅拌3min,低速搅拌转速为60r/min、搅拌3min时,化学混凝法对清淤尾水污染物的去除效果较好,对COD、TP和浊度的去除率分别可达:87.53%、91.36%和94.4%。

Dredging tail water greatly restricts the development of environmental protection dredging,because of its long settling time.The effects of the speed and time of fast stirring and the speed and time of slow stirring on the dredging tail water treatment were studied by chemical coagulation with the adding of polyaluminum chloride(PAC)and polyacrylamide(PAM).The results showed that when the speed of fast stirring was 200 r/min and 3 min,and the speed of slow stirring was 60 r/min and 3 min,the chemical coagulation method showed good removal efficiencies on the pollutants in the dredging tail water,and the removal rates of COD,TP and turbidity were 87.53%,91.36%and 94.4%,respectively.