改性铁阳极微生物电解池中电极驱动的氨厌氧氧化  

Ammonia anaerobic oxidation driven by electrodes in a modified iron anode microbial electrolysis cells

作　　者：施亚雯 熊昌勋 秦永丽[1] 蒋永荣[1] 谢锦邦 莫姗姗 邱立标 SHI Yawen;XIONG Changxun;QIN Yongli;JIANG Yongrong;XIE Jinbang;MO Shanshan;QIU Libiao(College of Life and Environmental Sciences,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学生命与环境科学学院,广西桂林541004

出　　处：《工业水处理》2022年第6期85-91,共7页Industrial Water Treatment

基　　金：国家自然科学基金资助项目(52060004);广西高校中青年教师科研基础能力提升项目(2021KY0204);广西区大学生创新训练项目(202010595230,S202110595254)。

摘　　要：在没有NO_(2)^(-)或短程硝化的情况下,厌氧氨氧化菌(AnAOB)可以微生物电解池(MECs)的阳极为电子受体氧化NH_(4)^(+)-N,这种电极驱动型厌氧氨氧化(E-Anammox)可有效解决传统厌氧氨氧化(Anammox)电子受体NO_(2)^(-)供给不稳定的问题。但MECs系统常用的铁阳极易发生腐蚀板结,导致电极导电能力下降、电子利用率降低。针对铁阳极易腐蚀的问题,对普通铁阳极进行包覆改性制备改性铁阳极,将改性铁阳极和普通铁阳极分别与MECs系统耦合加载于Anammox反应体系中,考察了2个反应体系中氨氧化、系统阻抗值、微生物群落结构的变化特征。结果表明,改性铁阳极-MECs反应器(R2)对氨氧化的促进作用强于普通铁阳极-MECs反应器(R1),至实验末期(第70天),R1和R2的NH_(4)^(+)-N去除速率分别为35.57 mg/(L·d)和76.72 mg/(L·d);R1的阻抗值由运行前期的小于R2增大至后期明显大于R2;AnAOB在R2中的相对丰度高于R1,而铁还原菌在R1中的相对丰度明显高于R2。对铁阳极进行包覆制备的改性铁阳极可减缓铁腐蚀,且在没有NO_(2)^(-)供给的情况下,可作为电子受体实现氨的厌氧氧化。In the absence of NO_(2)^(-)or partial nitrification,anaerobic ammonia oxidizing bacteria(AnAOB)can oxi⁃dize NH_(4)^(+)-N by using the anodes of microbial electrolytic cells(MECs)as electron acceptors.The electrodes depen⁃dent anaerobic ammonium oxidation(E-Anammox)can effectively solve the problem of unstable supply of NO_(2)^(-)which is electron acceptor in conventional anaerobic ammonium oxidation(Anammox).However,the commonly used iron anode in the MECs system is prone to corrosion slabbing,which leads to the decrease of electrode conduc⁃tivity and electron utilization.To solve the corrosion problem of iron anode,the modified iron anode was prepared by coating the common iron anode.The modified iron anode and the common iron anode were loaded with the MECs in the Anammox reaction system.The changes of ammonia oxidation,system impedance value,and microbial commu⁃nity structure during the energized operation were investigated.The results showed that the effect of modified iron anode-MECs reactor(R2)on ammonia oxidation was stronger than that of the common iron anode-MECs reactor(R1),and the NH_(4)^(+)-N removal rates of R1 and R2 at the end of the experiment(70 d)were 35.57 mg/(L·d)and 76.72 mg/(L·d),respectively.The impedance value of R1 increased from less than R2 in the early stage to more than R2 in the late stage.Furthermore,the relative abundance of AnAOB in R2 was higher than that in R1,and the relative abundance of iron-reducing bacteria in R1 was significantly higher than that in R2.Thus,it can be seen that the coating modification of iron anode could slow down its corrosion and play as an electron acceptor to achieve an⁃aerobic oxidation of ammonia in the absence of NO_(2)^(-)supply.

关 键 词：铁阳极 防腐 微生物电解池 厌氧氨氧化 

分 类 号：X703.1[环境科学与工程—环境工程]