不同产地粉末状沸石去除水中低浓度氨氮性能比较

Performance Comparison among Different Powdered Zeolites for Removing Low-concentration Ammonia Nitrogen from Water

通过静态试验比较了不同产地粉末状沸石去除水中低浓度氨氮的性能。结果表明,不同产地粉末状沸石对氨氮的吸附性能差别较大,按吸附容量由高到低依次为:缙云沸石≈阜新沸石>信阳沸石>赤峰沸石;不同产地的粉末状沸石对氨氮的去除率达到最大时的pH值不同,缙云沸石和阜新沸石在pH值为6时对氨氮的去除率最高,信阳沸石和赤峰沸石则在pH值分别为8和10时最高。对沸石吸附前、后水中离子浓度的测定结果表明,沸石吸附氨氮不会增加水中有害离子的浓度,用于对饮用水的处理是可行的。

The performances of different powdered zeolites for removing low-concentration ammonia nitrogen from water were compared through batch experiments. The results indicate that the adsorption performances of different powdered zeolites are different. The adsorption capacity is decreased in the order of Jinyun zeolite, Fuxin zeolite, Xinyang zeolite, and Chifeng zeolite. The highest removal efficiencies of ammonia nitrogen by different powdered zeolites are under different pH values. The highest removal efficiencies by Jinyun zeolite and Fuxin zeolite are at pH 6, Xinyang zeolite at pH 8 and Chifeng zeolite at pH 10. The change of ion concentration shows that the adsorption of ammonia nitrogen by zeolites will not add noxious elements into the water. Therefore, the treated water coincides with the standards of drinking water.