紫外光—降膜反应器处理垃圾渗滤液的研究

Study on Landfill Leachate Treated by Ultraviolet and Falling Film Reactor

采用紫外光与降膜反应器技术来深度处理垃圾渗滤液,研究了H2O2与污染物质化学计量比、Fe2+与H2O2比、水流速度以及溶解O2对COD去除效率的影响关系。实验结果表明:在H2O2与污染物质化学计量比小于0.78时,COD去除率实验值比理论值要大,且随计量比增加而增加,而计量比大于0.78时,实验值比理论值小,且随计量比的增加而小幅增加;Fe2+与H2O2之间存在一最佳比,在比为15.2×10-3时COD去除率最大;水流速度在反应初期对COD去除率有一定影响,而在反应后期影响不大;在合适时间段采取曝气充氧方式可提高紫外光反应速度。

Landfill leachate treated by an ultraviolet and falling film reactor was studied. Factors on the removal rate of COD （RRC） was investigated from stoichiometric ratio between H2O2 and pollutants （SRHP）, ratio between H2O2 and Fe^2＋（RFH）, leachate flow speed （LFS） to dissolved oxygen in leaehate. The results are as follows ： as SRHP is smaller than 0.78, the experimental value on the RRC is bigger than theoretical one, and RRC becomes larger while SRHP is increasing, and on the converse, when SRHP is larger than 0.78, the experimental value on RRC is smaller than theoretical one, and RRC becomes larger slowly while SRHP is increasing. There is a optimum RFH, and RRC has a maximum as optimum RFH is 15.2×10^-3. At the beginning of reaction, LFS influences RRC. However, LFS doesn＇t influence RRC at the end of experiment. Photocatalysis reactive speed is improved by aeration at a relevant time.