超声联合热活化过硫酸盐处理垃圾渗滤液

Treatment of Landfill Leachate by Ultrasonic and Thermal Activated Persulfate

对比研究了单独超声(US)、单独过硫酸盐(PS)、US-PS、热-PS和US-热-PS 5种反应体系对垃圾渗滤液的处理效果,考察了不同温度、PS投加量和pH对US-热-PS体系处理垃圾渗滤液的影响。结果表明,与其他反应体系相比,US-热-PS体系对垃圾渗滤液中色度、COD、NH3-N和UV254的处理效果最佳,该体系能够最大程度激活PS产生硫酸根自由基,进而氧化降解垃圾渗滤液中的污染物。在US-热-PS体系中,各指标的去除效果随着温度升高而提高,高温(50℃以上)更有利于PS的激活;PS投加量的增加能够促使体系产生更多的自由基,从而提高污染物的去除效果;酸性条件有利于色度、COD和UV254的去除,而碱性条件有利于NH3-N的去除。

The treatment efficiency of landfill leachate by five different reaction systems,i.e.,ultrasound(US) alone,persulfate(PS) alone,US-PS,heat/PS and US/heat/PS,were compared.The effects of different temperature,PS dosage and pH on the treatment of landfill leachate by US/heat/PS system were also investigated.The results showed that compared with the other reaction systems,the treatment efficiency of chrominance,COD,NH3-N and UV254 in leachate by US/heat/PS were the best,this system could activate PS to produce sulfate radical at utmost,leading to the oxidative degradation of the pollutants.The PS could be activated more easily at high temperature(above 50℃),resulting in the improvement of the removal efficiency of the contaminants with the increase of temperature in US/heat/PS system.More reactive radicals were produced with the increase of PS dosage,thus improving the removal efficiency of the pollutants.The degradation efficiency of chrominance,COD and UV254 was much higher under acidic condition in US/heat/PS system,while the removal of NH3-N was much better under alkaline condition.