用两个砂柱模拟实验研究了非均质及均质粗粒包气带结构对地下水氮污染的影响．结果表明，以蒸馏水混合液注入的Ⅰ号柱的ＮＯ３ － 的去除率为８５６９ ％ ；Ⅱ号柱的ＮＯ３ － 的去除率为３８２５ ％ ．以地下水混合液注入的Ⅰ号柱的ＮＯ３ － 的去除率为３２４８ ％ ；Ⅱ号柱的ＮＯ３ － 的去除率为２８９２ ％ ．上述数据说明，Ⅰ号柱的反硝化作用要强于Ⅱ号柱，在注入液都相同的情况下，显然Ⅰ号柱的四层粘性土夹层加强了柱内的还原环境 Two sand column simulation experiments were conducted to study the effect of heterogeneous and homogeneous coarse-grained gas zone on nitrogen contamination of groundwater. The results showed that the NO3 - removal efficiency of column Ⅰ with distilled water was 8569%. The NO3 - removal efficiency of column Ⅱ was 3825%. The NO3 - removal rate of I column injected with groundwater mixture was 3248%. The NO3 - removal efficiency of column Ⅱ was 2892%. The above data shows that the denitrification of column Ⅰ is stronger than that of column Ⅱ. Under the same injection conditions, it is obvious that the four-layer cohesive interlayer of column Ⅰ enhances the reducing environment in the column