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研究纳滤法对模拟核电站中、低放射性水平废水中痕量Co2+的去除效果,采用NFW-2B平板聚酰胺纳滤复合膜,考察了压力、pH、无机离子干扰和投加有机络合剂等情况下对膜通量和Co2+去除率的影响。结果表明,随着压力的升高,膜通量增大,截留率在一定压力范围内先增大后降低;pH对膜通量影响不大,在25℃、pH=10附近时,截留效果最佳;在以聚丙烯酰胺作为络合剂的情况下,pH=7、装载量比为0.25时得到较好的去除效果,有效截留率达到98%以上。
The effect of nanofiltration on the removal of trace Co2 + in low-level radioactive waste water of simulated nuclear power plant was studied. NFW-2B plate polyamide nanofiltration composite membrane was used to investigate the effects of pressure, pH, inorganic ion interference and dosing of organic complexing agent Effect of membrane flux and Co2 + removal rate. The results showed that with the increase of pressure, the membrane flux increased and the cut-off rate increased first and then decreased under a certain pressure range. The effect of pH on membrane flux was not significant. At 25 ℃ and pH = 10, In the case of polyacrylamide as the complexing agent, pH = 7, the loading ratio of 0.25 was better, and the effective rejection rate was more than 98%.