Cu^(2+)和Fe^(3+)对同步硝化反硝化过程N2O释放特征的影响  

Impacts of Cu^(2+) and Fe^(3+) on NO_(2) emission characteristics during simultaneous nitrification and denitrification process

作　　者：郭玉洁 于晓婷 李聪[1] 张菊[1] 邓焕广[1] GUO Yu-jie;YU Xiao-ting;LI Cong;ZHANG Ju;DENG Huan-guang(School of Environmental and Planning,Liaocheng University,Liaocheng 252059,China;Liaocheng City Ecological Environment Bureau,Liaocheng 252000,China)

机构地区：[1]聊城大学环境与规划学院,山东聊城252059 [2]聊城市生态环境局,山东聊城252000

出　　处：《现代化工》2021年第3期92-97,104,共7页Modern Chemical Industry

基　　金：国家自然科学基金(41401563);山东省自然科学基金(ZR2014JL028)。

摘　　要：针对废水中金属离子Cu^(2+)和Fe^(3+)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(N_(2)O)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Cu^(2+)和Fe^(3+)均能够强化SND过程脱氮效率;然而,长期Fe^(3+)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%;Cu^(2+)的投加强化了亚硝酸盐还原酶和N_(2)O还原酶(N_(2)OR)的活性,从而降低了N_(2)O的累积和释放;而Fe^(3+)的投加刺激了SND反应器中N_(2)O的产生,Fe^(3+)强化了一氧化氮还原酶(NOR)的活性,使得NOR/N_(2)OR活性比值上升,导致N_(2)O的积累;同时Fe^(3+)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N_(2)O的产生;高浓度的Cu^(2+)和Fe^(3+)抑制了系统中微生物活性,从而导致脱氮除磷效率下降及N_(2)O积累。The impacts of metal ions(Cu^(2+)and Fe^(3+))on nutrients removal and nitrous oxide(N_(2)O)emission during the simultaneous nitrification and denitrification(SND)process are evaluated,and the mechanism is further investigated.Results show that the addition of both Cu^(2+)and Fe^(3+)at moderate concentrations can enhance nitrogen removal efficiency by reinforcing the denitrification process.Long-term addition of Fe^(3+)weakens the removal of phosphorus by 2.3%-11.7%,due to the suppression of polyphosphate-accumulating organisms(PAOs)growth and activity.N_(2)O production and emission decreases greatly due to the addition of Cu^(2+),which is caused by the enhancement of nitrite reductase and N_(2)O reductase(N_(2)OR)activities.On the contrary,the addition of Fe^(3+)at moderate concentrations stimulates the production of N_(2)O in SND reactor.Fe^(3+)enhances the activity of nitric oxide reductase(NOR)and increases NOR/N_(2)OR ratio,leading to the accumulation of N_(2)O.Moreover,the addition of Fe^(3+)causes a reduction in polyhydroxyalkanoates synthesis at the anaerobic stage and reinforces glycogen-accumulating organisms activity instead of PAOs activity,resulting in an increased N_(2)O accumulation.Addition of high concentrations of Cu^(2+)and Fe^(3+)will suppress the nutrients removal and stimulates the production of N_(2)O,partly due to the inhibition of the bacterial activity.

关 键 词：同步硝化反硝化 金属离子 氧化亚氮 脱氮除磷 反硝化酶 

分 类 号：X703.1[环境科学与工程—环境工程]