混凝剂预处理非工艺低放废水研究

我国后处理工业示范厂和后处理大厂产生的非工艺低放废水具有年产生量大、成分复杂、污染核素种类多等特点。针对后处理非工艺低放废水的特点，初步探究了使用混凝剂处理非工艺低放废水的可行性。研究用非离子型聚丙烯酰胺（NPAM）为助凝剂，比较了聚合氯化铝（PAC）、聚合硫酸铁（PFS）、阴离子型聚丙烯酰胺（PAM）3种混凝剂对模拟非工艺低放废水中总有机碳（TOC）的去除效果。通过正交实验探讨了混凝效果的影响因素。结果表明：聚合氯化铝对模拟非工艺低放废水的混凝效果最佳，混凝剂的投加量是影响混凝效果的主要因素。当混凝剂和助凝剂的加入量分别为348 mg/L和24 μg/L、混凝时间为30 min、pH=5时，得到去除模拟非工艺低放废水中TOC的最优方案，TOC去除率达到24%。

Pre-Treatment of Non-Processing Low Level Radioactive Wastewater by Coagulant Technology

The characteristics of non-processing low level radioactive wastewater(LLRW) in reprocessing industrial demonstration plant and reprocessing plant were large of count, complex composition, and more types of contaminated nuclides. The feasibility of using coagulant was investigated based on the characteristics of non processing LLRW of reprocessing plant in this paper. Three coagulants were investigated for the removal of TOC in non-processing LLRW using NPAM as coagulant aids. Through orthogonal experiment, the influencing factors of coagulant result were probed in the work. The results show that the PAC is most effective to simulated non-processing LLRW; the dosage of coagulant is the major factor influencing the coagulant result. When the dosages of coagulant and coagulant aids are 348 mg/L and 24 μg/L respetively, the coagulation time is 30 min, and pH=5, the optimal scheme for removing TOC in non-processing LLRW is obtained. And the removal efficiency of TOC reaches 24%.