上流式生物滤池中CANON工艺的恢复启动方法

Re-Start-Up Technique of CANON Process in an Up-Flow Biofilter Reactor

为研究恢复启动全程自养脱氮(CANON)工艺的方法,在原CANON工艺反应器上流式生物滤池中进行小试试验.未对反应器内污泥进行任何处理的条件下,以自配的含NH4+-N和NO2--N的培养基质为入水,采取经由厌氧氨氧化(ANAMMOX)反应的方式,对停止运行约1年的原CANON工艺进行恢复启动.调整水力停留时间(HRT)和培养基质中NH4+-N、NO2--N质量浓度,启动ANAMMOX反应;然后,调整培养基质中NO2--N质量浓度和溶解氧(DO),成功启动了CANON反应器,整个过程共耗时67,d.CANON工艺恢复启动完成后,当HRT为4.25,h时去除效果较好,此时NH4+-N的容积负荷为160,mg/(L.d),NH4+-N的去除率为90%左右,总氮(TN)去除率约为70%,TN去除量与NO3--N生成量的比值介于1∶0.13与1∶0.32之间.

In an up-flow biofilter reactor, the re-start-up of completely autotrophic ammonium removal over ni- trite （CANON） process halted for about one year was investigated in a lab-scale experiment. In this study, the sludge in the reactor was not treated and the reactor was only fed with artificial culture medium composed of NH4＋-N and NO2--N. The CANON process was started-up via the anaerobic ammonium oxidation （ANAMMOX）process. By ad- justing the hydraulic retention time （HRT）and the mass concentration of NH4＋-N and NO2--N in culture medium, ANAMMOX process was first built up. After that, CANON process was started-up by adjusting the mass concentra- tion of NOE--N and the dissolved oxygen （DO） in the influent. The re-start-up of CANON process was successfully achieved in 67 d. After the start-up of the reactor, better performance was achieved when the HRT was 4.25 h and the nitrogen loading rate reached up to 160 mg/（L · d）. Meanwhile, the removal rates of NH4 ＋-N and TN were about 90% and 70%, respectively. The ratio of TN loss to increased NO3 -N was between 1 ： 0.13 and 1 ： 0.32.