RESEARCH ON ENHANCED COAGULATION TECHNOLOGY BASED ON DYNAMIC MIXING FOR WATERWORKS
To explore the effect of dynamic mixing on strengthening coagulation and its influencing factors,a comparative test of the coagulation effect was carried out with the assistance of dynamic mixing,static mixing,and tube mixing pilot test equipment in a water supply plant.The results showed that the comprehensive flocculation effect was ranked as dynamic mixing＞static mixing＞tube mixing.The removal rates of turbidity and chroma of dynamic mixing could reach 91％and 95％,respectively.The floc form was large and dense,which was conducive to sedimentation.The floc of static mixing and tube mixing was relatively loose.The removal rate of CODMn and TOC by dynamic mixing and other mixing methods was only in a range of 20％to 35％.Dynamic mixing had a better treatment effect on low temperature and turbidity water at a lower PAC dosage(20 mg/L),and the turbidity removal rate can still reach 90％.The study on the influence of flow rate,speed,turbine angle,pipe-turbine diameter ratio,installation distance,and other factors on dynamic mixing showed that the application of the dynamic mixing method should be combined with a low speed and a short installation distance from the flocculation tank in the treatment of small flow rate,while the opposite is true for a large flow rate.It is recommended to choose a smaller turbine angle(30° to 45°),and the turbine diameter ratio has no significant influence on the coagulation effect.
dynamic mixingenhanced coagulationstatic mixingtube mixinglow temperature and low turbidity water
万方数据
维普
