絮凝沉淀处理含^(241)Am废水时絮凝体粒径分布的影响因素初探

PRELIMINARY INVESTIGATION OF IMPACTING FACTORS OF PARTICLE SIZE DISTRIBUTION OF FLOCCULE FOR TREATMENT OF ^(241)Am-CONTAINING WASTEWATER

实验研究了利用FeSO4絮凝沉淀处理含241Am废水时,在各种絮凝条件下絮凝体的粒径分布情况。结果显示,在絮凝剂中Fe3+浓度为40 mg/L,废水的pH值为8.5~10,曝气速率在0.10 L/min^0.14L/min之间时,絮凝体颗粒粒径较大而且分布比较集中,优势粒径范围为7 500~20 000 nm,该粒径范围的絮凝颗粒占总体份额大于82%。在此条件下,经絮凝沉淀结合中空纤维膜微滤工艺处理含241Am废水的去污效率达到99.9%,对废水浓缩系数可达180。

The paper gives distribution of floccule diameter for ^241 Am wastewater flocculated by FeSO4 under varions flocculating conditions. The result show that particle numbers of diameter of floccule which are of narrow-dispersed size between 7 500 ～ 20 000 nm are more than 82% of the total when the pH is between 8.5 and 10, with concentation of Fe^3 ＋ around 40 mg/L and areration rate in the range of 0.10 L/min and 0.14 L/ min. Combining flocculating setting with hollow fiber filtation, the decontamination efficiency of ^241Am can be up to 99.9%.