摘要
采用等温吸附和吸附动力学实验,研究了三种人工湿地填料页岩、陶粒和砾石对磷的吸附特性。结果表明:Freundlich和Langmuir模型均能较好地拟合各填料对磷的吸附特征,各填料对磷的理论饱和吸附量大小依次为页岩(527.992 mg/kg)>陶粒(328.165 mg/kg)>砾石(129.729 mg/kg);各填料对磷的吸附过程分为快、中、慢3个阶段,三种填料对磷的吸附速率依次为页岩>陶粒>砾石;准二级动力学方程、双常数方程和Elovich方程均能较好地描述人工湿地填料对磷的吸附动力学特征,但从相关系数来看,准二级动力学方程的描述更为准确。
The phosphorous adsorption characteristics of three substrates（shale,haydite,gravel） in constructed wetland were studied by isotherm adsorption and adsorption kinetics experiment.The results showed that both Freundlich and Langmuir equations were well fitted for describing the adsorption characteristics of these substrates.The phosphorous theoretical saturated adsorption capacity of three substrates followed shale（527.992mg/kg） haydite（328.165mg/kg）gravel（129.729mg/kg）.The process of adsorption could be divided into fast,middle and slow stages.The rate of adsorption followed that shale haydite gravel.Pseudo second order kinetics,dual constant and Elovich equations could be suitable to describe adsorption characteristics of three substrates.In terms of correlation coefficient,Pseudo second order kinetics equation is the best model.
出处
《水资源与水工程学报》
2011年第6期16-19,共4页
Journal of Water Resources and Water Engineering
基金
国家自然科学基金项目(51079068)
天津市科技计划重点项目(09ZCGYSF00400
08FDZDSF03402)
国家水体污染控制与治理重大专项(2008ZX07314-005-001
2009ZX07209-001)
关键词
人工湿地
填料
磷
吸附等温线
吸附动力学
constructed wetland
substrate
phosphorous
adsorption isotherm
adsorption kinetics
