Dean涡的微粒分离原理在污水2级处理中的应用

APPLICATION OF PARTICULATE SEPARATION PRINCIPLE OF DEAN VORTICES IN THE TREATMENT OF SECONDARY EFFLUENT

将弯道层流流动形成的Dean涡产生的微粒分离原理运用于污水的2级处理,通过研发水动力分离处理装置,采用投加适量絮凝剂后的某河水进行实验,研究在流道中不同体积流量和絮凝剂含量下装置的分离效果。结果表明：当进水粒径在94.55~161.4μm时,分离效果最好;当体积流量小于600 m L/min时,体积流量越大则分离效果越高,而体积流量大于600 m L/min后,分离效果基本不变;在体积流量为600 m L/min时对浊度的去除率在90%以上,对TP和SS去除率分别在85%和50%以上,经装置分离后的清水的浊度大致为1 NTU;在体积流量为600 m L/min时,絮凝剂Fe Cl3的适宜投加质量浓度为21 mg/L。

Particulate separation principle, which produced by Dean vortices of the formation of the bend laminar flow, was applied to the treatment of secondary effluent. With designed hydrodynamic separation device, the effect of separation under different flow velocity and dosage of flocculants was investigated by experiments with the river with moderate flocculants. The results showed that the effect of separation was best while influent particle size was between 94.55 and161.4 μm. The effect of separation enhanced as the flow velocity increased when volume flow rate was under 600 mL/min, and the effect remained stable when flow velocity was over 600 mL/min. The turbidity, TP and SS removal rate were over 90%, 85% and 50%, respectively, when the volume flow rate was 600 mL/min. Alter the secondary effluent was separated through the device, the turbidity of clean water was about 1 NTU. The optimal mass concentration of FeCl3 was 21 mg/L when volume flow rate was 600 mL/min.