摘要
通过土柱模拟试验,分析了再生水灌溉条件下土壤Cd的运移规律。结果表明,pH值为7时,Freundlich等温吸附方程拟合效果较好并获得土壤运移参数Kf、β;在室内土柱穿透试验的确定系数(0.992)以及水动力弥散系数D的基础上,使用HYDRUS-1D软件TSM模型拟合Cd穿透曲线,获得土壤运移参数f、a;基于TSM模型,再生水灌溉100、300、500a时,累积质量浓度为0.742、1.419、1.783mg/kg。长期灌溉条件下,Cd质量浓度高于中国土壤环境质量标准最高容许量,再生水灌溉风险较高。
Through soil column simulated experiment,the movement of soil Cd was analyzed under reclaimed water irrigation.The results indicated that when pH was 7,the fitting effect of Freundlich isothermal adsorption equation was better,which could obtain the migration of soil parameters such as Kfandβ;On the basis of determination coefficient of 0.992 through indoor soil column experiment and the D,HYDRUS-1DTSM model was used to fit Cd penetration curve and get soil migration parameters such as f and a;Using TSM model,the soil Cd accumulation concentrations were 0.742,1.419,1.783mg/kg for100,300,500 years under reclaimed water irrigation.Under long-term irrigation,soil Cd concentration was higher than that of soil environmental quality standards,and there was higher risk under reclaimed water irrigation.
出处
《灌溉排水学报》
CSCD
北大核心
2016年第1期27-31,共5页
Journal of Irrigation and Drainage
关键词
再生水
CD
土壤
模拟预测
reclaimed water
Cd
soil
simulation prediction
