Experiment and Study On Effect Of Sludge External Reflux Ratio On The Dosage Of Micro Vortex clarifier

摘要

In order to solve some problems about selecting blindly and randomly design and operational parameters of micro vortex clarifier. By studying the raw water from Kongmu-Lake, this experiment chooses PAC as the best coagulant, and its best dosage is 25 mg/L. Meanwhile the influence of micro vortex clarifierdosagein different sludge external reflux ratio is researched. Experiments are conducted in three kinds of reflux ratios respectively 10%, 30% and 50%. Inlet flow is 10m~3/h, the flocculation time is 6.8mins, adding the quantity of PAC gradually increased from 20 mg/L to 45 mg/L, when external reflux ratio is 30%, micro vortex clarifier has the best treatment effect. The lowest turbidity, total phosphorus, COD_(Mn) and ammonia nitrogen of the water are respectively 0.376NTU, 0.102mg/L, 2.44mg/L, 7.76mg/L. At this time, the best dosage is 30 mg/L, and the best reflux ratio is 30%. The test provides scientific data to support the application of micro vortex clarification technology.