摘要
采用江苏盱眙凹凸棒石粘土进行模拟氨氮废水的脱氮实验研究。结果表明,在氨氮溶液初始浓度为300mg·L-1、pH为2.5～9.0时,两种凹凸棒石粘土对氨氮的吸附量较高。两种凹凸棒石粘土对氨氮的吸附等温线符合Freundlich方程,相关系数都在0.99以上,且氨氮在AP-10凹凸棒石粘土上的吸附量相当于氨氮在AP-2凹凸棒石粘土上吸附量的3倍。同时,两种凹凸棒石粘土对氨氮的吸附动力学符合准二级吸附动力学模型,主要是以化学吸附为主。AP-10样品在应用于畜禽废水处理中,氨氮去除率达到75.1%。
The adsorption of palygorskite, collected from Xuyi, Jiangsu province, on ammonia nitrogen in waste water was discussed in the paper. Results show that for the two tested palygorskite samples, a higher ammonia nitrogen adsorption capacity is observed when the initial concentration of ammonia nitrogen is 300 mg·L^-1 and pH value ranges from 2.5 to 9.0. The data are well fitted by Freundlich isotherm, with the correlation coefficients over 0.99. Ammonia nitrogen adsorption amounts by AP-10 palygorskite is three times higher than that of AP-2. The ammonia nitrogen adsorption dynamics model can be described by the pseudo second-order model and chemical adsorption predominated its adsorption process. Palygorskite AP-10 can remove ammonia nitrogen from animal farming waste water with the efficiency of 75.1%.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2008年第4期1525-1529,共5页
Journal of Agro-Environment Science
基金
江苏省科技攻关项目(BE2006371)
