摘要
采用批平衡试验方法,研究了再生水灌溉条件下北京3种典型土壤对NH4+-N短期动态吸附解吸规律。结果表明,NH4+-N在3种典型土壤中易被吸附,吸附量随添加液浓度升高而增加,吸附过程中初期NH4+-N浓度变异性较大,同时NH4+-N在解吸试验后期浓度变异性也较大。对NH4+-N的吸附能力从强到弱依次为壤土A>壤土B>砂壤土,通过等温吸附平衡模型模拟,拟合效果较好。试验结果分析表明,再生水灌溉带来的NH4+-N远未达到土壤的吸附容量,不会迁移至地下水层,不会污染地下水。
Short-time dynamic adsorption and desorption of NH4^＋-N of reclaimed water in 3 representative soils of Beijing is discussed in a well-stirred batch reactor. The adsorption results indicate that NH4^＋-N was adsorbed eas creased with the ily in 3 representative soils. Adsorption quantity of NH4^＋-N in 3 representative soils ininitial concentration of NH4^＋-N. The concentration of NH4^＋-N varied greatly in the process of adsorption. Meanwhile concentration of NH4^＋-N is also varied in the late of desorption experiments. The adsorption capacity of NH4^＋-Nfrom strong to weak was loam soil A〉loam soil B〉sand loam soil. Equilibrium data were well described by typical adsorption isotherm models. The test results showed that NH4^＋-N of reclaimed water for irrigation was far from the soil adsorption capacity, which did not move to the groundwater aquifers and pollute groundwater.
出处
《灌溉排水学报》
CSCD
北大核心
2008年第4期14-17,24,共5页
Journal of Irrigation and Drainage
基金
北京市“十一五”重大科技攻关课题(D0706007040291)
国家863计划课题(2006AA100205)
关键词
NH4^+-N
吸附解吸动力学
再生水
北京典型土壤
NH4^＋-N
adsorption and desorption kinetics
reclaimed water
Beijing representative soil
