在上流式反应器中添加尼龙填料，并以小颗粒单质硫和NaHCO₃作为底物构建自养高效脱氮系统。在（35±1）℃下，经过70 d运行，在HRT为2.4 h、进水NO₃^--N浓度为150 mg/L时，达到1.3 kg/（m³·d）的最大稳定脱氮能力。启动初期，应该缓慢提高进水NO₃^--N负荷来驯化反应器。S/N（摩尔）批次试验发现，在最佳摩尔比为10时，NO₃^--N的转化率为90%；而摩尔比低于10时，NO₃^--N转化速率随着单质硫粉浓度增大而增大，且摩尔比为1.1时，会出现NO₂^--N积累。由于传质效率低和单质硫流失问题，连续流反应器中S/N（摩尔）比宜在5.5以上，防止出现NO₂^--N积累。当进水NO₃^--N浓度为150 mg/L、HRT为2.4 h时，控制温度从（35±1）℃缓慢降至（20±0.5）℃，反应器脱氮能力稳定在1.4~1.5 kg/（m³·d），说明本反应器对温度下降适应性较强，具备常温下高效运行的能力。

A high efficient autotrophic nitrogen-removing system is developed by adding nylon filler in an upflow reactor and using fine elemental sulfur particles and NaHCO₃ as substrates.The maximum stable nitrogen removal capacity 1.3 kg/(m³·d) is achieved after 70 days' operation with an influent NO₃^--N concentration of 150 mg·L^-1 and a HRT of 2.4 h at 35±1℃.At the beginning of the startup,the volumetric loading rate of NO₃^--N in influent shall be increased slowly in order to acclimate the reactor.It is found from the S/N (mol) batch experiments that the conversion rate of NO₃^--N can reach 90% under the optimum S/N molar ratio of 10.When the molar ratio of S/N is lower than 10,the conversion rate of NO₃^--N increases with the increase of the concentration of elemental sulfur.The NO₂^--N accumulation occurs when the molar ratio of S/N is 1.1.Due to the problems of low mass transfer efficiency and elemental sulfur loss,it is necessary to ensure S/N molar ratio above 5.5 in the continuous reactor to prevent the occurrence of NO₂^--N accumulation.The nitrogen removal rate of the reactor can remain stable at 1.4-1.5 kg/(m³·d) when the NO₃^--N concentration in influent is 150 mg·L^-1,HRT is 2.4 h,the temperature decreases slowly from 35±1℃ to 20±0.5℃.It reveals that the reactor has strong adaptability to temperature drop and has the ability to run efficiently at normal temperature.

姚鹏程(1993-),男,硕士生