针对废水中金属离子Cu²⁺和Fe³⁺对同步硝化反硝化（SND）污水处理过程污染物去除及温室气体氧化亚氮（N₂O）释放特征的影响进行了研究，并分析了其影响机理。结果表明，适宜浓度下Cu²⁺和Fe³⁺均能够强化SND过程脱氮效率；然而，长期Fe³⁺的投加抑制了反应器中聚磷菌的生长和活性，从而使系统中总磷去除率下降2.3%~11.7%；Cu²⁺的投加强化了亚硝酸盐还原酶和N₂O还原酶（N₂OR）的活性，从而降低了N₂O的累积和释放；而Fe³⁺的投加刺激了SND反应器中N₂O的产生，Fe³⁺强化了一氧化氮还原酶（NOR）的活性，使得NOR/N₂OR活性比值上升，导致N₂O的积累；同时Fe³⁺的投加降低了SND过程厌氧阶段聚羟基脂肪酸酯的合成，导致系统中聚糖菌在与聚磷菌的竞争中占据优势，并促进了N₂O的产生；高浓度的Cu²⁺和Fe³⁺抑制了系统中微生物活性，从而导致脱氮除磷效率下降及N₂O积累。

The impacts of metal ions (Cu²⁺ and Fe³⁺) on nutrients removal and nitrous oxide (N₂O) emission during the simultaneous nitrification and denitrification (SND) process are evaluated,and the mechanism is further investigated.Results show that the addition of both Cu²⁺ and Fe³⁺ at moderate concentrations can enhance nitrogen removal efficiency by reinforcing the denitrification process.Long-term addition of Fe³⁺ weakens the removal of phosphorus by 2.3%-11.7%,due to the suppression of polyphosphate-accumulating organisms (PAOs) growth and activity.N₂O production and emission decreases greatly due to the addition of Cu²⁺,which is caused by the enhancement of nitrite reductase and N₂O reductase (N₂OR) activities.On the contrary,the addition of Fe³⁺ at moderate concentrations stimulates the production of N₂O in SND reactor.Fe³⁺ enhances the activity of nitric oxide reductase (NOR) and increases NOR/N₂OR ratio,leading to the accumulation of N₂O.Moreover,the addition of Fe³⁺ causes a reduction in polyhydroxyalkanoates synthesis at the anaerobic stage and reinforces glycogen-accumulating organisms activity instead of PAOs activity,resulting in an increased N₂O accumulation.Addition of high concentrations of Cu²⁺ and Fe³⁺ will suppress the nutrients removal and stimulates the production of N₂O,partly due to the inhibition of the bacterial activity.

郭玉洁(1987-),女,硕士研究生,研究方向为污水处理技术,381210357@qq.com