| 氨氮在饱水粉砂土和亚砂土层中吸附过程及其模拟 |
| 摘要点击 1055 全文点击 1352 投稿时间：1995-09-04 |
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| 中文关键词 氨氮 饱水亚砂土层 饱水粉砂土层 迁移 土柱试验 |
| 英文关键词 ammonium ion saturated silty sand saturated sandy loam transportation dynamic soil column experiment |
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| 中文摘要 |
| 为在土地处理系统中选择合适保护土层厚度,防止NH4+对地下水污染。通过动态土柱试验,研究了NH4+在饱和粉砂土层和亚砂土层中的吸附性能。用Cameron平衡-动态吸附模型模拟了NH4+在土层中的迁移过程,求得了不同土层和不同浓度条件下模型的各参数值,并求解出不同时刻,不同氨氮浓度条件下的沿程NH4+浓度分布曲线。研究表明,在实验条件下,粉砂土和亚砂土的纵向弥散系数分别为0.175和0.0093cm2/min;当水中氨氮浓度为13.7和41.0mg/L时,粉砂上动态饱和吸附容量分别为0.156和0.400mg/g;当氨氮浓度为51.0mg/L时,亚砂土的动态饱和吸附容量为1.33mg/g. |
| 英文摘要 |
| The adsorption characteristics of ammonium ion in saturated silty sand and sandy loam were studied by means of dynamic soil column experiments. The transportation of ammonium ion in soil were modelled with a combined equilibrium and kinetic adsorption model (Cameron's model). The coefficients (K1, K2 and K3) under different soil and NH4+ concentration in water were obtained.The distribution curves of ammonium ion in soil were drawn. The results indicate that the longitudinal dispersion coefficients (D) in silty sand and sandy loam are 0.175 cm2/min and 0.0093 cm2/min respectively. The dynamic adsorption capacity of silty sand are 0.156 mg/g when concentration of NH4+ in water is 13.7 mg/L and 0.400 mg/g when concentration of NH4+ in water is 41.0 mg/L; the dynamic adsorption capacity of sandy loam is 1.33 mg/g when concentration of NH4+ in water is 51.0 mg/L. Above results can be used to determine the suitable thickness of protective soil in land treatment system of wastewater. |
