超临界水氧化法处理垃圾渗滤液的试验研究

Treatment of landfill leachate by supercritical water oxidation

针对垃圾渗滤液传统处理方法工艺复杂、效果欠佳的缺点,采用间歇式超临界水氧化反应装置,对西安市某垃圾填埋场垃圾渗滤液进行氧化降解试验研究。分析了压力、温度、停留时间及过氧量等影响氧化降解效果的4个主要因素。结果表明,压力、温度、停留时间及过氧量的增加能显著提高垃圾渗滤液中CODCr及NH3-N的去除率;在压力为26 MPa、温度为420℃、停留时间为10 min、过氧量为2.0的条件下,该水样的CODCr去除率最高可达98.43%,NH3-N去除率最高可达96.61%。

The traditional treatment of landfill leachate is complicated and of low effect.A simpler and more effective method of supercritical water oxidation is used for landfill leachate oxidation degradation in Xi＇an in an experimental study.Four factors,namely,pressure,temperature,hold time and oxygen excess rate,are investigated.The result shows that the increase of pressure,temperature,hold time and oxygen excess rate can promote the removal of ammonia nitrogen（NH3-N） strikingly.Under the conditions of pressure at 26 MPa,temperature at 420 ℃,hold time at 10 min and oxygen excessat2.0,theremovalrateofCODCrisupto98.43%andthatofammonianitrogenupto96.61%.