摘要
通过实验室模拟研究黄河(兰州段)河岸带沉积物对氨氮的吸附特征及影响因素,有助于揭示沉积物在吸附氨氮中“源”与“汇”的特征及天然屏障的作用。研究结果表明:吸附在120 min达到平衡,吸附量达到1200.19 mg/kg。在15、20、25℃下,ENC0分别为4.17、3.12、2.45 mg/L。吸附过为単分子层吸附,在15、20、25℃下,Langmuir模型拟合得到的最大吸附量Qm分别为1868.57、2638.26、3025.18 mg/kg。沉积物在偏酸性条件下对氨氮的吸附效果较好,吸附量最大pH值为5,吸附量为1222.02 mg/kg。沉积物对氨氮的吸附率随扰动频率的增加而变大,扰动频率为0、50、100、150、200 r/min时,吸附率分别为25.5%、43.0%、50.6%、56.2%和74.3%。沉积物对氨氮的吸附率随氨氮的浓度增加先增大后减小,吸附率在浓度为10 mg/L时达到极值73.5%。通过皮尔逊系数相关性分析得到:R扰动频率(0.948)>R温度(0.923)>RpH(-0.862)>R初始浓度(-0.321)。
Through laboratory simulation,the adsorption characteristics and influencing factors of sediments in the riparian zone of the Yellow River(Lanzhou section)on ammonia nitrogen were studied,which helped to reveal the characteristics of the"source"and"sink"of sediments in the adsorption of ammonia nitrogen and the role of natural barriers.The research results showed that the adsorption reached equilibrium in 120 min,and the adsorption capacity reached 1200.19 mg/kg.At 15,20 and 25℃,ENC 0 was 4.17,3.12 and 2.45mg/L,respectively.At 15,20 and 25℃,the maximum adsorption capacity Q m fitted by Langmuir model is 1868.57 mg/kg,2638.26 mg/kg and 3025.18 mg/kg,respectively.The adsorption effect of ammonia nitrogen is better under acidic conditions,and the maximum adsorption capacity is 1222.02 mg/kg under pH 5.The adsorption rate of ammonia nitrogen increases with the increase of disturbance frequency.When the disturbance frequency is 0,50,100,150 and 200 r/min,the adsorption rates are 25.5%,43.0%,50.6%,56.2%and 74.3%,respectively.With the increase of ammonia nitrogen concentration,the adsorption rate of the sediment first increased and then decreased,and the adsorption rate reached an extreme value of 73.5%when the concentration was 10 mg/L.The R disturbance frequency(0.948)>R temperature(0.923)>R pH(-0.862)>R initial concentration(-0.321)was obtained by Pearson coefficient correlation analysis.
作者
杨光
李佩钢
王若凡
刘雨欣
田开栋
谢微
唐悦
Yang Guang;Li Peigang;Wang Ruofan;Liu Yuxin;Tian Kaidong;Xie Wei;Tang Yue(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,Gansu,China)
出处
《绿色科技》
2024年第18期170-179,共10页
Journal of Green Science and Technology
基金
国家自然科学基金(编号:51969011)
甘肃省科技厅计划项目(编号:21JR1RA242)
甘肃省教育厅高等学校科研项目(编号:2020B-109)。
关键词
河岸带
氨氮
吸附
影响因素
riparian zone
ammonia nitrogen
adsorption,effecting factors
