PN-ANA技术处理热水解厌氧消化液工艺的启动及运行调试

Startup and operation of PN-ANA technology for treating anaerobic digestion liqui d treated by thermal hydrolysis

在北京某污水处理厂成功启动了短程硝化厌氧氨氧化(PN-ANA)技术处理热水解厌氧污泥消化液的工艺,并评价了该旁侧技术对主流区的影响。该工艺运行结果表明:在接种生物膜的填料填充比为5%,生物膜上AnAOB占比大于10%的情况下,经过6个月调试运行之后,PN-ANA工艺出水可达到设计指标;总氮去除负荷为0.3 kg·(m^(3)·d)^(−1),总氮去除率达到78%。估算表明,旁侧PN-ANA工艺可使日处理量为100×10^(4) t水厂的出水总氮降低约3 mg·L^(−1)。另外,通过分子生物学分析发现,工程调试过程中氨氧化菌(AOB)和厌氧氨氧化菌(AnAOB)呈缓慢增长趋势,与处理效果的提升趋势相一致。该工艺成功运用厌氧氨氧化处理热水解厌氧污泥消化液,启动时间仅为半年,可为该技术处理高氨氮废水的工程应用提供参考。

A practical project of a sewage treatment plant in Beijing was taken as an example to investigate the effect of partial nitritation-anammox(PN-ANA)process on the dewatering liquid of anaerobic digestion pretreated with thermal hydrolysis(THP-AD),and the influence of sidestream PN-ANA technique on the mainstream was evaluated.The operation results showed that when the inoculation amount of biofilm was 5%and the proportion of anaerobic ammonia-oxidizing bacteria(AnAOB)on biofilm was more than 10%,after 6 months of commissioning and operation,the effluent of PN-ANA process reached the design index.The total nitrogen removal load was 0.3 kg·(m^(3)·d)^(-1) and the total nitrogen removal rate reached 78%.It was estimated that the sidestream PN-ANA technique could reduce the total nitrogen by about 3 mg·L^(-1) in the eflluent of a water plant with a day capacity of 100×10^(4) t.Meanwhile,the ammonia oxidizing bacteria(AOB)and anaerobic ammonia-oxidizing bacteria(AnAOB)showed a trend of slow growth during engineering commissioning by molecular biology detection,which was consistent with the improvement trend of the project treatment effect.In this project,anaerobic ammonium oxidation was successfully used to treat thermal hydrolysis anaerobic sludge digestion liquid,and the start-up time was only half a year,which can provide reference for the engineering application of this technology to treat high ammonia nitrogen wastewater.