污水淋滤模拟试验氮转化迁移分析及D_(sh)(θ)的估计

Simulation Analysis of Nitrogan Transport and Transformation in a Large Scale Column during the Waste Water Leahing and Estimation of D_(sh)(θ)

通过分析氯离子、氮化合物等污染质在地质环境系统中循环一转化规律,设计并开展了污染质转化迁移室内大型物理模拟污水淋滤试验.根据不同的物理化学条件和污水灌水条件,进行了高浓度污水淋滤-分子扩散弥散试验和间歇性低浓度污水淹水弥散试验.分析讨论了二种条件下氯离子、氮化合物在非饱和土层中转化迁移规律.以物理模拟试验资料为基础,探索了原位测定和计算非饱和条件下污染质弥散系数的方法,并利用模拟试验中 Cl^-浓度的实测资料检验了计算结果,结果比较满意.

With the aim to study the transport and transfomation of pollutes in the unsaturated zone, a large scale leaching experiment wih NH_4Cl solution was made to simulate the motions of Cl^-,NH_4^+, NO_2^-,NO_2^-.Tests under two different irrigation conditons were conducted,their results clearly show the behaviors of these ions in soil.A phenomentol diffusion coefficient of Cl^- as function of soil water content 0 was calculated from a part of the experimental data.It is found that,this coefficient can be successfully used to discribe the Cl^- motion with unsaturated soil water.