CANON工艺脱氮处理二沉池出水的研究

STUDY ON NITROGEN REMOVAL OF EFFLUENT OF SECONDARY SEDIMENTATION TANK BY CANON PROCESS

采用一套有效容积为150 mL的上向流生物滤池反应器,接种实验室所培养的厌氧氨氧化污泥,在反应器停止运行约1年后,以自配的含NH4+-N和NO2--N废水为进水,恢复启动CANON工艺。反应器启动成功后,以二沉池出水为对象,进行脱氮处理研究。试验结果表明,通过控制进水基质溶解氧的方法,经厌氧氨氧化过程转化,成功启动了CANON工艺,共耗时38 d,NH4+-N的容积负荷为168 g.m-3.d-1,NH4+-N的去除率在90%左右,TN的去除率在70%左右。在二沉池出水NH4+-N质量浓度为25～35 mg·L-1,COD为40～60 mg·L-1,UV254为0.6～0.9 cm-1,HRT为3 h,DO质量浓度在0.4 mg·L-1左右的条件下,稳定运行25 d,NH4+-N的去除率在95%左右,TN的去除率在65%左右,COD和UV254的平均去除率分别为17%与4%。

There-start-upofcompletelyautotrophieammoniumremovalovernitrite （CANON） processwereinvestigatedinal50mLup-flowbiofilter reactor that had been halted for about a year seeding with anaerobic ammonium oxidation sludge from laboratory, which were fed with artificial waste-water composed of NH4^＋-N and NO2-N at a proper ratio. After the start-up of the CANON reactor, taking the effluent of the secondary sedimentation tank as the, the nitrogen removal of the object is discussed. The results showed that ,by controlling the dissolved oxygen of influent substrate, The authors spent 38 days in successfully transited starting up. The CANON was from the anaerobic ammonium oxidation process and the volumetric loading rate was up to 168 g· m^-3· d^-1 with the removal rate of 90% for NH2-N and 70% for TN, respectively. Under the condition of NH4^＋-N of 25 to 35 mg· L^-1 in the effluent of the secondary sedimentation tank, COD of40-60 mg·L^-1, UV254 of0.6-0.9 cm^-1, HRT of 3 h and DO of about 0.4 mg·L^-1,the removal rate of NH4＋-N is about 95% and TN is above 65%. The average of removal rate of COD and UVzs4 is 17% and 4% respectively.