摘要
研究了氨氮浓度、温度、时间、共存阳离子等对氨氮在天然沸石上吸附的影响 ,比较了HCl及NaCl溶液对氨氮解吸的效果 ,初步探讨了沸石吸附氨氮后自然硝化的规律 .结果显示 ,随着氨氮浓度的增大或温度的升高 ,沸石吸附量上升 ,最大可达 1 1 5mg·g- 1 ;沸石吸附的初始阶段 (0— 8h) ,沸石吸附量随时间显著上升 ,此后趋于平缓 ;在不同阳离子共存的情况下 ,K+可使沸石吸附量降低 5 0 %以上 ;HCl溶液对氨氮解吸的效果好于NaCl溶液 ,解吸率最高可达到 6 0 % ;沸石吸附的氨氮在硝化细菌作用下可转化为硝氮 ,溶液中硝氮浓度 1 2 0h后可达 9mg·l- 1 ,在总氮中比率达到 2 7% .
The effects of ammonia-nitrogen concentration,temperature,time,coexisting cations on the adsorption of ammonia-nitrogen onto the natural zeolite were studied,while the effects of HCl and NaCl solution on the desorption of ammonia-nitrogen from the natural zeolite were discussed respectively.Nitrification of ammonia-nitrogen on the zeolite in NH 4Cl solution was also researched.With ammonia-nitrogen concentration or temperature increasing in NH 4Cl solution,adsorption capacity of zeolite would rise to the maximum value of 11.5mg·g -1.In the beginning of the adsorption process(0—8 hour),adsorption capacity of zeolite would rise obviously,and after this period,it would rise slowly.Due to the coexisting of K +,adsorption capacity of zeolite could decrease 50%.Compared to the NaCl solution,HCl solution had a better effect on the desorption of ammonia-nitrogen with the maximum desorption efficiency of 60%.Ammonia-nitrogen on the natural zeolite could be transformed to nitrate-nitrogen under the effect of nitrification bacteria,and the concentration of nitrate-nitrogen in NH 4Cl solution could reach 9mg·l -1 in 120 hours with the ratio of 27% in total nitrogen.
出处
《环境化学》
CAS
CSCD
北大核心
2003年第2期166-171,共6页
Environmental Chemistry
基金
科技部重大专项"滇池流域农业面源污染控制技术" (K990 5 3 5 0 2 )
关键词
氨氮
沸石
吸附
解吸
硝化
氨氮废水
ammonia-nitrogen,zeolite,adsorption,desorption,nitrification.
