CANON工艺处理实际晚期垃圾渗滤液的启动实验

Start-up and characterization of nitrogen and COD removal from mature landfill leachate via CANON process

针对晚期垃圾渗滤液NH^+_4-N浓度高、C/N低、深度脱氮困难的问题,采用CANON工艺在曝气/缺氧搅拌循环交替的运行方式下,处理晚期垃圾渗滤液实现了深度脱氮。系统经过130 d的驯化培养后成功启动,长期试验研究结果表明,在进水COD、NH^+_4-N、TN浓度(mg·L^(-1))分别为2050±250、1625±75和2005±352情况下,出水COD、NH^+_4-N、TN浓度(mg·L^(-1))能达到407±14、8±4和19±4,总氮去除率达到了98.76%。在未投加外碳源的情况下,CANON工艺在曝气/缺氧搅拌的运行方式下实现了对晚期垃圾渗滤液的深度脱氮。此外,经荧光原位杂交(FISH)检测表明,在该运行方式下能够成功富集氨氧化菌和厌氧氨氧化菌,各占总菌数的19.5%±1.3%和42.7%±5.02%,为CANON工艺用于处理晚期垃圾渗滤液的工程应用提供参考。

The mature landfill leachate from sanitary landfill is difficult to treat because of complicated composition, high concentration of ammonia and low C/N. During this study, a CANON（completely autotrophic nitrogen removal over nitrite） process with an intermittent aeration/anaerobic mixing operational mode was applied to remove nitrogen from mature landfill leachate. After domestication of 130 d, the system was stable with the effluent COD, NH~＋_4-N and TN（mg·L^（-1）） of 407±14, 8±4 and 19±4 when the influent COD, NH~＋_4-N and TN（mg·L^（-1）） were 2050±250, 1625±75 and 2005±352, respectively. Nitrogen removal from mature landfill leachate could be realized via intermittent aeration/anaerobic mixing CANON process with 98.76% of total nitrogen removal efficiency. Besides, the FISH（Fluorescence in situ hybridization） results showed that under this operational mode, both aerobic ammonium oxidation bacteria and anaerobic ammonium oxidizing bacteria accounted for 19.5%±1.3% and 42.7%±5.02%, respectively, which provided a reference for CANON treating mature landfill leachate in engineering application.