改性沸石对低浓度氨氮废水的动态吸附

Ammonia nitrogen dynamic adsorption from low concentration wastewater by modified zeolite

采用氯化钠溶液对甘肃白银天然沸石改性,以低浓度氨氮(NH4+-N)废水为处理对象,对比了天然沸石和改性沸石的动态吸附特性并绘制穿透曲线,利用Origin软件对实验数据分析处理,得出穿透曲线的通式。结果表明:在相同条件下,改性沸石的穿透时间和吸附饱和时间都比天然沸石的长约1.5倍;沸石经氯化钠改性后,对NH4+-N的吸附速率和饱和吸附量都明显提高,吸附性能显著改善。Origin软件对水溶液中NH4+-N的吸附穿透曲线的Logistic模型回归式具有较高的精度,该模型可以很好地反映沸石吸附剂的动态吸附过程。

Sodium chloride aqueous solution was used to modify the natural zeolite obtained from Gansu Province. The properties of low concentration ammonia nitrogen（ NH4^＋ -N）dynamic adsorption from wastewater by the natural and modified zeolites were studied. Breakthrough curve was drawed and the experimental data were dealt by Origin software to get the model of breakthrough curve equation. The results showed that under the same conditions, the penetration and saturation time of modified zeolite column was about 1.5 times longer than that of natural zeolite column. The adsorption rate and adsorption capacity of modified zeolite by sodium chloride were significantly improved. It indicated that Logistic model was fit for the dynamic adsorption of NH4^＋-N on the zeolite by linear correlative coefficient of breakthrough curve.