磷酸铵镁沉淀法对渗滤液尾水中氨氮的处理效果

Effect of Magnesium Ammonium Phosphate Precipitation on Ammonia Nitrogen in Leachate Tail Water

生活垃圾填埋场中的垃圾渗滤液因其污染物种类多且复杂,处理难度较大,一直以来都是填埋场环境治理领域的难点。垃圾渗滤液经过处理后,其中的氨氮多转化为硝态氮和有机氮,碳源浓度低,难以进一步通过反硝化降解。采用磷酸铵镁沉淀法进一步将垃圾渗滤液尾水中的无机氮进行降解,对于初始氨氮浓度为65 mg/L的垃圾渗滤液尾水进行试验,结果表明,当溶液pH为9.5,硫酸镁和磷酸氢二钠的投加量分别为1 g/L和1.1 g/L,反应时间为60 min时,对氨氮的去除效率最佳,去除效率可以达到70%左右。由此表明,磷酸铵镁沉淀法可以有效降解垃圾渗滤液尾水中氨氮的含量。

The landfill leachate in domestic waste landfills has always been a difficult problem in the field of landfill environmental management because of its variety and complexity of pollutants.After the landfill leachate is treated,the ammonia nitrogen in it is mostly converted into nitrate nitrogen and organic nitrogen,and the carbon source concentration is low,which is difficult to be further degraded by denitrification.In this study,the inorganic nitrogen in the landfill leachate tailwater was further degraded by the magnesium ammonium phosphate precipitation method,and the initial ammonia nitrogen concentration was 65 mg/L in the landfill leachate tailwater.The dosages of magnesium and disodium hydrogen phosphate were 1 g/L and 1.1 g/L,respectively.When the reaction time was 60 min,the removal efficiency of ammonia nitrogen was the best,and the removal efficiency could reach about 70%.This shows that the magnesium ammonium phosphate precipitation method can effectively degrade the content of ammonia nitrogen in landfill leachate tail water.