微波催化氧化法预处理垃圾渗滤液的研究

采用微波-活性炭-Fenton催化氧化预处理垃圾渗滤液,研究了不同因素对垃圾渗滤液处理效果的影响.结果表明,COD和氨氮去除率随活性炭用量、微波辐射时间和微波功率增加而增加;随Fe2+用量和H2O2用量增加,COD和氨氮去除率先增加而后下降;随pH值增加,氨氮去除率显著增加,COD去除率变化不明显.在微波功率为300W,pH值为8,活性炭9g/L,Fe2+用量为0.02mol/L,H2O2用量为7mL/L,辐射时间6min条件下,垃圾渗滤液中COD和氨氮去除率分别达到68.22%和78.08%,SS去除率达到78.55%,浑浊度去除率达到99.02%,颜色由黑褐色去除为接近无色,BOD5/COD由0.21提高到0.45;研究比较了不同处理对垃圾渗滤液的处理效果.结果显示,微波催化氧化对垃圾渗滤液中COD和氨氮去除率明显高于其他处理.

Study on pretreatment of landfill leachate by microwave-assisted catalytic oxidation process

The microwave,activated carbon and Fenton were applied to catalyze and oxidize the landfill leachate, the effects of different influential factors on the removal of landfill leachate were investigated. The results indicated that the removal rates of COD and NH3-N enhanced with the increase in AC dosage, microwave radiation time and microwave power. However, with the increase in Fe (Ⅱ) and H2O2 dosage, the removal rates of COD and NH3-N firstly increased then decreased; with the increase of pH value, the NH3-N removal rate increased significantly while the change of COD removal rate was not obvious. When the microwave power was 300W, pH value was 8, AC dosage was 9 g/L, Fe (Ⅱ) dosage was 0.02mol/L, H2O2 dosage was 7mL/L and radiation time was 6 min, the removal rates of COD, NH3-N, SS and turbidity could reach 68.22%, 78.08%, 78.55% and 99.02% respectively, the colour of the landfill leachate was removed from dark-brown to nearly colorless, the biodegradability (BOD5/COD) of the landfill leachate was improved from 0.21 to 0.45 after the treatment; moreover, the removal effects of different treatments on landfill leachate were compared, the results showed that the COD and NH3-N removal rates by microwave-assisted catalytic oxidation process were higher than other treatments significantly.