Wang Songlin, Wu Xiaohui, Wang Yansong, Li Qifen, Tao Meijun
School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR China.
Ultrason Sonochem. 2008 Sep;15(6):933-7. doi: 10.1016/j.ultsonch.2008.04.006. Epub 2008 Apr 25.
Experiments on the removal of organic matters and ammonia nitrogen from landfill leachate by ultrasound irradiation were carried out. The effects of COD reduction and ammonia removal of power input, initial concentration, initial pH and aeration were studied. It was found that the sonolysis of organic matters proceeds via reaction with ()OH radicals; a thermal reaction also occurs with a small contribution. The rise of COD at some intervals could be explained by the complexity of organic pollutant sonolysis in landfill leachate. Ultrasonic irradiation was shown to be an effective method for the removal of ammonia nitrogen from landfill leachate. After 180 min ultrasound irradiation, up to 96% ammonia nitrogen removal efficiency can be obtained. It was found that the mechanism of ammonia nitrogen removal by ultrasound irradiation is largely that the free ammonia molecules in leachate enter into the cavitation bubbles and transform into nitrogen molecules and hydrogen molecules via pyrolysis under instant high temperature and high pressure in the cavitation bubbles.
开展了超声辐照去除垃圾渗滤液中有机物和氨氮的实验。研究了功率输入、初始浓度、初始pH值及曝气对化学需氧量（COD）降低和氨去除的影响。研究发现，有机物的声解通过与·OH自由基反应进行；同时也发生热反应，但贡献较小。在某些时间段化学需氧量的升高可通过垃圾渗滤液中有机污染物声解的复杂性来解释。超声辐照被证明是去除垃圾渗滤液中氨氮的有效方法。超声辐照180分钟后，氨氮去除效率可达96%。研究发现，超声辐照去除氨氮的机制主要是渗滤液中的游离氨分子进入空化气泡，并在空化气泡内瞬间高温高压下通过热解转化为氮分子和氢分子。
