摘要
采用新型的离子吸附交换材料NanoChem分子筛,研究对高浓度氨氮的模拟废水和实际垃圾渗滤液的去除效果.结果显示,氨氮吸附符合Langmuir吸附等温线,其中单位NanoChem分子筛吸附氨氮饱和浓度以N计算为364 mg.g-1,对高浓度氨氮的吸附能力比天然沸石或者微孔分子筛强3～30倍.在间歇实验中考察了操作参数对氨氮去除的影响,NanoChem分子筛20 h后基本达到离子交换平衡;氨氮去除量随着初始浓度的增加而增加,而去除率则随着初始浓度的增加而减少;同时溶液初始pH值不但影响氨氮去除率还影响离子交换特性;再生前后氨氮去除效果变化不大,重复性强.动态连续流研究发现NanoChem分子筛能用于实际高浓度氨氮废水的去除,去除率可达到100%.
This paper assesses the potential of NanoChem zeolite for ammonia removal from synthetic solution and actual landfill leachate.The data from experiments in batch study were applied to Langmuir isotherm.The saturated amount of NH4^＋-N adsorbed per unit weight of NanoChem zeolite was about 364 mg·g^-1,which yield significantly 3-30 times higher ammonium adsorption capacity than nature zeolite and Microporous molecular sieves.The results of batch study showed that the contact time needed at least 20 h in order to attain exchange equilibrium;the ammonia removal capacity of NanoChem zeolite increased with the increase of initial ammonia concentration,while the ammonia removal rate decreased with the increase of initial ammonia concentration;the pH had an effect on ammonia removal efficiency as it can influence both the character of the exchanging ions and the NanoChem zeolite itself;regeneration made little change on ammonia removal efficiency,repeatability was good.In column study,the NanoChem zeolite was used for high ammonia nitrogen removal such as actual landfill leachate and the ammonia nitrogen was removed 100%.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2010年第1期111-116,共6页
Environmental Science
基金
浙江省自然科学基金重点项目(Z507721)
