超声／Fenton联用技术处理垃圾渗滤液中的有机物

Degradation of organics in landfill leachate by ultrasound/Fenton process

详细研究了超声/Fenton联用技术对垃圾渗滤液中有机物的处理效果。研究内容包括:超声波频率对垃圾渗滤液色度和COD去除率的影响,超声波功率对垃圾渗滤液色度和COD去除率的影响以及Fenton试剂用量和pH值对垃圾渗滤液色度去除率和COD去除率的影响。还利用一次正交回归实验确定了超声/Fenton联用技术处理垃圾渗滤液的优化条件,并在优化条件的基础上,对超声波技术、Fenton高级氧化技术和超声/Fenton联用技术对垃圾渗滤液的处理效果进行比较研究。研究结果表明:超声/Fenton联用技术对垃圾渗滤液的色度去除率和COD去除率最高,其色度去除率接近100%,COD去除率达到73.5%。超声/Fenton联用技术处理垃圾渗滤液的优化条件是:超声频率为28 kHz,超声功率为75W,Fe2+浓度为280 mg/L,H2O2浓度为1.29×104mg/L,pH值为2.5。超声波的频率、功率和Fenton试剂用量之间存在优化匹配值。

The treatment of landfill leachate by ultrasound/Fenton process was carried out. The effects of operating conditions such as ultrasonic frequencies, ultrasonic powers, Fenton＇ s reagent dosage and pH value on color and COD removal were investigated. The optimal conditions of ultrasound/Fenton process were found. Color and COD removal rates of ultrasound process, Fenton process and ultrasound/Fenton process under optimal conditions were compared. The experimental results indicated that ultrasound/Fenton process attained higher color and COD removal rates than ultrasound process and Fenton process. Almost 100% of color removal rate and 73.5% of COD removal rate were attained in ultrasound/Fenton process in 90 minutes. The optimal conditions in this research were ultrasonic frequency of 28 kHz, power input of 75 W, FeE^＋ concentration of 280 mg/L, n202 concentration of 1.29 - 104 mg/L and pH value of 2.5. There are optimal matching values among ultrasonic frequencies, ultrasonic powers, Fenton＇ s reagent dosage and pH value.