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%. (authors)