短程硝化–厌氧氨氧化在实际垃圾渗滤液处理工程中的启动运行研究

Study on the Start-up and Operation of Partial Nitrification-Anammox in the Actual Landfill Leachate Treatment Project

针对新型脱氮工艺短程硝化‒厌氧氨氧化(ANAMMOX)过程中亚硝氮难以稳定生成的难题,设计水解酸化+UASB+好氧氧化的处理工艺,应用于实际垃圾渗滤液处理工程。结果表明,当进水氨氮浓度为610~1900 mg/L,C/N比为1.8~3.5时,在进水量为100 m3/d,回流比为2:1,pH值为7.5~8.0,DO为2.0 mg/L的调试条件下,O池发生短程硝化,积累200 mg/L的亚硝氮,积累率最高达78%。微生物DNA检测发现,O池中AOB物种丰度是NOB的10倍以上。水解酸化池中存在COD、氨氮和总氮同时去除的现象,COD去除量不能满足全部总氮反硝化,剩余的总氮通过厌氧氨氧化过程去除,通过ANAMMOX反应去除的总氮占水解酸化池总氮去除量的35%~67%。在实际垃圾渗滤液处理工程中,通过控制进水量、回流比、pH和溶解氧等条件,成功地启动短程硝化‒厌氧氨氧化工艺。

Partial nitrification-anaerobic ammonium oxidation(ANAMMOX)is a new process of nitrogen remova1.Aiming at the problem of stable formation of nitrite in the current work,an in-line system combined with hydrolysis acidification+UASB+aerobic oxidation was designed to improve the formation of nitrite nitrogen and applied to the actual landfill leachate treatment project.Results showed that when the concentrations of ammonia nitrogen and C/N ratio were 610–1900 mg/L and 1.8–3.5 in the influent,respectively.By the condition of 100 m3/d water inflow,2:1 reflux ratio,7.5–8.0 pH value and 2.0 mg/L dissolved oxygen(DO),partial nitrification happened in the aerobic tank,and 200 mg/L nitrous oxide accumulated with the highest accumulation rate of 78%.Microbial DNA analysis showed that the abundance of AOB species in aerobic tank was more than 10 times that of NOB.COD,ammonia nitrogen and total nitrogen in the hydrolytic acidification tank were removed at the same time.The removal amount of COD could not denitrificate all the total nitrogen,and the remaining total nitrogen was removed by the ANAMMOX process.The total nitrogen removed by ANAMMOX reaction accounted for about 35%–67%of the total nitrogen removal amount in the hydrolytic acidification tank.In the actual landfill leachate treatment project,by controlling the inflow,reflux ratio,pH and DO,the partial nitrification-ANAMMOX process was successfully conducted.