| 化学合成施氏矿物与H2O2共存体系下光化学处理垃圾渗滤液的研究 |
| 摘要点击 4329 全文点击 1781 投稿时间：2013-08-26 修订日期：2013-11-20 |
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| 中文关键词 施氏矿物 H2O2 光化学 垃圾渗滤液 异相Fenton |
| 英文关键词 schwertmannite H2O2 photochemical landfill leachate heterogeneous Fenton |
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| 中文摘要 |
| 选择高效快速的处理方法来降解垃圾渗滤液中高浓度有机污染物具有重要的实际意义.本研究采用化学合成施氏矿物/H2O2/UV法，探究了施氏矿物添加量、V（H2O2）/m（施氏矿物）等对垃圾渗滤液色度、TOC、COD去除效果的影响.结果表明，渗滤液色度、TOC、COD去除率随施氏矿物添加量的增加均呈先显著上升后逐渐稳定的趋势，在最佳添加量12 g·L-1时，色度、TOC去除率随着V（H2O2）/m（施氏矿物的增大均有所提高，而当V（H2O2）/m（施氏矿物）大于2时，COD去除率受H2O2影响反而呈下降趋势，最佳去除率为44.9%；另外，高强度紫外光更有利于施氏矿物/H2O2光化学氧化污染物，在500 W条件下，最佳起始pH=2.5的渗滤液光化学处理2.5 h后，色度、TOC和COD去除率分别为90.0%、78.8%和52.6%；同时，研究发现常温条件更有利于施氏矿物/H2O2/UV法处理垃圾渗滤液，当温度大于25℃ 时，COD去除率呈逐渐下降趋势.对照试验表明，与传统均相Fenton反应相比，施氏矿物/H2O2法有利于渗滤液色度的去除. |
| 英文摘要 |
| It is practically important that high concentrations of organic pollutants in landfill leachate were degraded by a rapid and efficient approach. The influence of operating conditions such as schwertmannite dosage, V(H2O2)/m(schwertmannite) ratio on the degradation efficiency of color, TOC and COD contents of landfill leachate, was investigated by using the schwertmannite/H2O2/UV process. It was demonstrated that the color, TOC and COD removal efficiencies increased significantly with the increase in schwertmannite dosage, and then were approximately stable. However, COD removal efficiency declined because of the presence of the residual H2O2 when V(H2O2)/m(schwertmannite) was greater than 2, and the best removal efficiency of COD was 44.9%. Furthermore, high-intensity ultraviolet was more conducive to eliminate pollutants through photochemical oxidation with schwertmannite/H2O2. The color, TOC and COD removal efficiencies were 90.0%, 78.8% and 52.6% respectively after 2.5 hours of photochemical degradation, with UV-500 W under optimal initial pH=2.5; meanwhile, this study found that it was beneficial to the photochemical degradation of leachate at room temperature via the schwertmannite/H2O2/UV process, and COD removal efficiency declined gradually when the temperature was higher than 25℃. Controlled trials showed that the schwertmannite/H2O2 method was conducive to the removal of color compared with the traditional homogeneous Fenton reaction. |
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