进水氨氮浓度对静置/好氧/缺氧SBR脱氮除磷性能的影响

在4个序批式反应器(SBR)R1、R2、R3和R4中,以静置段代替传统厌氧段,采用后置缺氧,考察进水氨氮浓度分别为20,30,40,50mg/L对静置/好氧/缺氧SBR脱氮除磷性能的影响.结果表明,R1、R2、R3和R4长期运行中磷去除率分别为82.3%、92.8%、92.6%和89.1%,总氮(TN)去除率分别为97.2%、88.6%、84.5%和72.6%.静置段省却搅拌,但仍起厌氧段作用,仍可实现生物强化除磷.4个反应器好氧段均发生同步硝化-反硝化(SND),分别贡献14.7%、16.6%、17.8%和14.8%的进水后TN量,且后置缺氧段利用糖原驱动反硝化,脱氮效果较好,出水TN分别为0.57,4.43,6.61,13.70mg/L.研究表明,进水氨氮浓度可影响静置释磷、好氧摄磷、反硝化除磷.静置段代替厌氧段的后置缺氧工艺可取得较好脱氮除磷效果,且节约成本,简化工艺.

Effect of influent ammonia concentration on biological nutrient removal in sequencing batch reactor with static/aerobic/anoxic regime

To investigate the effect of influent ammonia concentration on biological nutrient removal (BNR) performance of sequencing batch reactor (SBR) with static/aerobic/anoxic configuration, fours SBRs (R1, R2, R3 and R4) were operated with influent ammonia concentration of 20, 30, 40and 50mg/L respectively. The results demonstrated that 82.3%, 92.8%, 92.6% and 89.1% of phosphorus (P) removal efficiencies and 97.2%, 88.6%, 84.5% and 72.6% of total nitrogen (TN) elimination efficiencies were respectively obtained in R1, R2, R3 and R4 during the long-term operation. It could be concluded that static phase without stirring could function as anaerobic phase in this process, and thus enhanced the biological phosphorus removal. Simultaneous nitrification-denitrification (SND) was observed in the four systems and achieved respective 14.7%, 16.6%, 17.8% and 14.8% of TN elimination. Post-denitrification was driven by glycogen, achieving 0.57, 4.43, 6.61 and 13.70mg/L of effluent TN in R1, R2, R3 and R4 respectively. The research indicated that different influent ammonia loadings had impacts on P release in static phase, aerobic P uptake and denitrifying P uptake in anoxic period; Post-anoxic denitrification process with anaerobic stage replaced with static phase displayed excellent BNR efficiencies, and could save cost and simplify procedure.