厌氧氨氧化过程中无机碳对脱氮效能的影响

Influence of Inorganic Carbon on Nitrogen Removal Efficiency During the ANAMMOX Process

采用上流式厌氧氨氧化(anaerobic ammonium oxidation,ANAMMOX)反应器,通过氮去除效能的变化,研究无机碳(inorganic carbon,IC)在厌氧氨氧化过程中的作用及IC质量浓度对厌氧氨氧化过程的影响.结果表明:当进水不投加IC时,反应器脱氮效能明显下降,当进水IC和总无机氮(total inorganic nitrogen,TIN)的质量浓度之比ρIC/ρTIN为0.2~0.4时,脱氮效能得到恢复并逐步提高.ρ_(IC)/ρ_(TIN)从0.4继续提高至1.0时,脱氮效能不再发生明显变化.在ρ_(IC)/ρ_(TIN)为0.4的条件下启动新反应器,运行61天后氮去除负荷达到1.04 kg·m^(-3)·d^(-1),ANAMMOX菌活性明显高于原反应器.表明厌氧氨氧化过程中,IC主要提供碳源并充当反应催化剂,充足的IC供应是提高ANAMMOX活性和维持稳定脱氮的必要条件,厌氧氨氧化启动过程中进水IC和TIN最佳质量浓度之比为0.4.

The influence of inorganic carbon（ IC） on anaerobic ammonium oxidation（ ANAMMOX） process was investigated by evaluating the nitrogen removal efficiency in an upflow ANAMMOX reactor. Results show that the nitrogen removal efficiency decreases significantly when stop adding IC into influent water. The nitrogen removal efficiency recovers and increases gradually when the mass concentration ratio of influent IC to total inorganic nitrogen（ TIN） is 0. 2 ~ 0. 4. Increasing the ratio from 0. 4 to 1. 0 cannot bring a better nitrogen removal efficiency. When a new reactor was started up with the ratio of 0. 4,the achieved nitrogen removal efficiency comes up to 1. 04 kg·m^（-3）·d^（-1） after 61 days stable operation. The ANAMMOX bacteria in the new reactor present higher activity than that in the previous reactor. Results suggest that IC provides a suitable carbon source and plays a catalytic role in the ANAMMOX process.Sufficient IC is important to maintain the activity of ANAMMOX bacteria and the stability of the nitrogen removal efficiency. 0. 4 is the optimal ratio in the influent for ANAMMOX process.