Ca^(2+)对磷酸铵镁沉淀法处理垃圾渗滤液效果的影响

Effect of Ca^(2+) on Landfill Leachate Treatment Efficiency by Ammonium Magnesium Phosphate Precipitation

生活垃圾渗滤液中存在着大量Ca^(2+),会对磷酸铵镁沉淀法处理渗滤液产生一定影响。通过试验设置渗滤液中不同浓度Ca^(2+),探索其对磷酸铵镁沉淀法降低COD和氨氮效果的影响。结果表明,磷酸铵镁沉淀法对氨氮的去除率从65.12%下降至37.87%,对COD的去除率也从51.90%下降至42.52%。因此,垃圾渗滤液中Ca^(2+)的含量会影响Mg^(2+)与PO_4^(3-)、氨氮结合,降低氨氮和COD的去除率。

There is a large amount of Ca^2+ in leachate of household garbage,and they will have a certain impact on leachate treatment by ammonium magnesium phosphate precipitation.By setting different concentrations of Ca^2+ in the leachate,a test was conducted to explore the effect of Ca^2+ on the reduction efficiency of COD and ammonia nitrogen in the leachate by magnesium ammonium phosphate precipitation method.The results showed that the removal rate of ammonia nitrogen by ammonium magnesium phosphate precipitation method decreased from 65.12% to 37.87%,and the removal rate of COD also decreased from 51.90% to 42.52%.Therefore,the Ca^2+ content in landfill leachate can affect the binding of Mg^2+ with PO43- and ammonia nitrogen,and reduce the removal rate of ammonia nitrogen and COD.