改性粉煤灰吸附沼液中氨氮的动力学和热力学研究  

Kinetics and Thermodynamics of Adsorption of Ammonia Nitrogen from Biogas Slurry by Modified Fly Ash

作　　者：袁基刚[1] 刘兴勇[1] 李敏[1] 

机构地区：[1]四川理工学院材料与化学工程学院,四川自贡643000

出　　处：《中国给水排水》2015年第9期96-99,共4页China Water & Wastewater

基　　金：四川省科技支撑计划项目(2014GZ0132)

摘　　要：以自制改性粉煤灰为吸附剂，在静态吸附条件下，研究了其对沼液中氨氮的吸附性能，并对其吸附过程进行了动力学和热力学分析。结果表明，改性粉煤灰对沼液中氨氮的等温吸附可较好地采用Langmuir方程来描述，此吸附过程可用二级吸附动力学方程较好地表征；在30—50℃的范围内，吸附过程为吸热过程，反应的吉布斯自由能变小，同时伴随着熵值的增加。The adsorption performance of ammonia nitrogen from biogas slurry was studied using self-made modified fly ash under static conditions, and the kinetics and thermodynamics of the adsorption process were analyzed. The results showed that the adsorption isotherm curves of ammonia nitrogen from biogas by the modified fly ash could be well described by Langmuir isotherm model. The adsorption process could be better characterized by the pseudo-second-order model than the pseudo-first-order mod- el. The adsorption process was endothermic, the Gibbs energy was decreased, and the entropy was in- creased in the range from 30 to 50 ℃.

关 键 词：改性粉煤灰 沼液 氨氮 吸附动力学 吸附热力学 

分 类 号：X705[环境科学与工程—环境工程]