超声波-TiO_2光催化联合处理垃圾渗滤液

Treatment of landfill leachate by coupling system of titanium dioxide and ultrasonic

采用超声波强化TiO2光催化技术处理垃圾渗滤液。研究了TiO2催化剂用量、光照作用、超声波作用、pH值、曝气作用等因素对垃圾渗滤液中COD和氨氮去除率的影响。结果表明,在TiO2粉末的投加量为2 g/L、pH值为11时,先采用功率为292.5 W的超声波辐射3 min,再以高压汞灯(250 W)照射3 min,垃圾渗滤液中的COD和NH3-N去除率分别达到50.1%和75%。若在同一条件下进行饱和曝气可以使NH3-N去除率进一步达到85.3%,但会降低COD的去除率。

The effects of TiO2 dosage,ultraviolet,ultrasonic,pH and aeration on degradation of COD and N-NH＋4 in landfill leachate were studied by the ultrasonically enhanced photocatalytic technology.The results showed that removal rates of COD and NH3-N reached 50.1% and 75%,respectively,when the TiO2 dosage was 2 g/L,pH was 11,ultrasonic（292.5 W）was radiated 3min and high pressure mercury lamp（250 W） irradiated 3 min.The removal rate of NH3-N could reach to 85.3% by aerated under the same conditions,but the removal rate of COD reduced.