【摘要】 采用厌氧/好氧/好氧/厌氧(AOOA)中试系统处理老龄垃圾渗滤液,通过控制DO在0. 1～0. 5 mg/L等条件成功实现了短程硝化反硝化。在低溶解氧和碱度充足的条件下,O1池的NO-2-N积累率稳定在90%以上,系统对NH+4-N和TN的去除率分别高于95%和66. 5%,有效解决了老龄垃圾渗滤液的脱氮难题。在控制溶解氧为0. 3～0. 5 mg/L的条件下,O1池进行亚硝化的限制条件是实际水力停留时间(AHRT),宜控制在13. 9 h以上。在正常运行阶段,A1池中的优势菌种为反硝化菌,而O1池的优势菌为AOB。此外,O1/O2池实现了NO-2-N的积累,并在一定程度上形成了同步亚硝化反硝化(SND)体系。更多还原

【Abstract】 A pilot-scale anaerobic/oxic/oxic/anaerobic( AOOA) process was applied for treatment of mature landfill leachate,and partial nitrification and denitrification was achieved by controlling the dissolved oxygen( DO) to a low value of 0. 1-0. 5 mg/L. Under the condition of low dissolved oxygen and sufficient alkalinity,the nitrite accumulation rate in the first aerobic reactor( O1) was stably above 90%,and the removal rate of ammonium and total nitrogen of the whole process was higher than95% and 66. 5% respectively,which indicated that AOOA process could effectively solve the difficult problem of nitrogen removal in landfill leachate. The limiting factor of partial nitrification of O1 was the actual hydraulic retention time( AHRT) and should be controlled above 13. 9 h under the condition of DO of 0. 3-0. 5 mg/L. In the normal operation stage,the dominant bacteria in the first anaerobic reactor( A1) were denitrifying bacteria,while the dominant bacteria in the O1 were ammonia-oxidizing bacteria( AOB). In addition,nitrite accumulation was realized in O1/O2,and simultaneous partial nitrification and denitrification( SND) was formed to a certain extent.更多还原