【摘要】 高氨氮短程硝化厌氧氨氧化一体化（PN/A）工艺的稳定性受亚硝态氮影响显著。考察了高氨氮PN/A工艺受亚硝态氮短期抑制后,系统脱氮性能快速恢复的策略。稳定运行的PN/A污泥在ρ（NO^-₂-N）=200 mg/L条件下抑制2 h后,首先考察厌氧氨氧化菌在不同初始亚硝态氮浓度下的活性变化。此外,考察了受抑制后的PN/A工艺在不同DO浓度（0.05～1 mg/L）下的脱氮性能,结果表明:当NO^-₂-N浓度降低至50 mg/L以下时,厌氧氨氧化菌才明显表现出活性;受抑制后的PN/A工艺中,厌氧氨氧化菌对DO敏感度增加,恢复时系统的DO宜低于正常运行时浓度。综上所述,受NO^-₂-N抑制的PN/A工艺要恢复脱氮性能,宜降低亚硝态氮浓度同时控制DO浓度。在连续运行的PN/A反应器（200 L）,诱发NO^-₂-N浓度提高到160 mg/L时,TN去除负荷从0.57下降至0.2 kg/（m³·d）。通过合理控制DO和NO^-₂-N浓度,系统负荷在30 d内即可恢复至原有水平,验证了以上恢复策略的可行性。更多还原

【Abstract】 The stability of partial nitrification and anammox（PN/A） process is seriously impacted by nitrite nitrogen. In this study, the strategy for rapid recovery of systematic nitrogen removal performance by high-strength ammonium PN/A process after nitrite inhibition was investigated. After inhibiting PN/A sludge of stable operation for 2 h under ρ（NO【math150 z】-N）=200 mg/L, firstly, the change in anammox activity under different nitrite nitrogen concentrations nitrogen removal performance of PN/A process under different DO concentration（0.05～1 mg/L） after nitrite inhibition were investigated and the results showed that anammox could show significant activity only when the NO^-₂-N concentration decreased to be lower than 50 mg/L. In addition, anammox bacteria became more sensitive to dissolved oxygen during the PN/A process after inhibition, and for recovering, the concentration of DO should be lower than that of normal operation. To sum up, to recover the nitrogen removal performance of PN/A process under nitrite inhibition, it was suggested to reduce the nitrite nitrogen concentration and control the DO concentration. In a PN/A reactor（200 L） of continuous operation, NO【math151 z】-N concentration was induced to be increased to 160 mg/L, and the total nitrogen removal rate decreased from 0.57 to 0.2 kg/（m³·d）. Through reasonably controlling concentrations of DO and nitrite nitrogen, the system load recovered to the initial level in 30 d, which confirmed the feasibility of the above recovery strategy.更多还原