填埋层空气状况对渗滤液中氮成分变化的影响

Effect on Nitrogen Component in Leachate under Different Air Conditions in Landfill Layers

渗滤液回灌厌氧填埋层可以有效降解渗滤液中的有机物 ,但却对氨氮去除无效 ;而且由于有机物降解的加速 ,使回灌后渗滤液中氨氮的质量浓度比常规垃圾填埋场更高 ,从而导致渗滤液必须再经过复杂的物化处理后才能达标排放 .为此 ,通过实验室模拟 ,研究了垃圾层中空气状况对回灌渗滤液出水中氮成分变化的影响 .结果表明 :只要向填埋层供给少量空气 ,就可有效降低渗滤液中氨氮的质量浓度 。

Although leachate re-circulating to anoxic landfill layers can accelerate the rate of decomposing organic pollutant in leachate,it has no effect on removing ammonia nitrogen.And it will accumulate more ammonia nitrogen in leachate than that in conventional landfill leachate,thereby requiring additional complex physical-chemical treatment prior to discharge standard.Lysimeters were established in the laboratory to study the impact on the nitrogen conponent in leachate re-circulating under different air conditions in landfill layers.The results indicate that if only ventilating a little air,the high concentration of ammonia nitrogen can be effectively reduced.Consequently the burden on following leachate treatment is greatly eased.