考虑地下水温度的土壤吸附氨氮动力学行为研究  

Study on dynamic behavior of ammonia nitrogen adsorbed by soil considering groundwater temperature

作　　者：隋淑梅[1] 尹志刚[2] 姜利国[1] 海龙[1] 

机构地区：[1]辽宁工程技术大学力学与工程学院,辽宁阜新123000 [2]辽宁工程技术大学矿业学院,辽宁阜新123000

出　　处：《水资源与水工程学报》2016年第3期217-220,225,共5页Journal of Water Resources and Water Engineering

基　　金：国家自然科学基金青年基金项目(51304113)

摘　　要：吸附反应是氨氮进入地下水环境后发生的重要行为,直接影响氨氮在地下水中的迁移扩散规律。本文以阜新地区粉质黏土、细砂、粗砂为例,结合北方地下水温度,分别进行了温度在5、10、15、20℃时3类典型土壤的氨氮吸附动力学行为试验研究。试验结果表明：在5~20℃范围内,温度越低,粒径越小,3类土壤対氨氮的吸附量越大;5、10、15、20℃时粉质黏土、细砂与10、15、20℃时粗砂对氨氮的吸附动力学过程均符合准二级动力学模型,5℃时粗砂对氨氮的吸附动力学过程符合准一级动力学模型,吸附过程均属于化学吸附;温度在5、10、15、20℃时细砂,粗砂的限速步骤为颗粒内扩散。Adsorption reaction is the important behavior taken place when ammonia nitrogen enters soil, and. directly influences the dispercal law of ammonia nitrogen in groundwater. Combined north groundwa- ter temperature , the paper took silk clay, fine sand and coarse sand in Fuxin region for example, and re- spectively studied the dynamic behavior of ammonia nitrogen adsorption soil adsorption of three types of soil at 5,10,15,20℃. The experimental results show that at the temperature of 5 to 20 centigrade,the lower the temperature, the smaller the particle diameter, the greater the amount of adsorption of ammonia nitrogen in three soils;the dynamics process of sandy clay and fine sand at 5,10,15,20℃ and coarse sand at the temperature of 10,15,20℃ conform to the secondary dynamic model. The adsorption kinetics of coarse sand conform to the first - order kinetic model at the temperature of 5℃, their adsorption process belongs to chemical adsorption. The rate - limiting step of fine and coarse sand at the temperature of 5,10,15,20℃ is intraparticle diffusion.

关 键 词：氨氮 吸附动力学 地下水水温度 土壤吸附氨氮 

分 类 号：S153.3[农业科学—土壤学]