反应器结构对生物电化学脱氮系统性能的影响

摘要

基于氢自养反硝化原理,构建了三组不同结构的生物电化学系统(Bioelectrochemical system,BES),并以考察不同反应器结构对BES脱氮性能的影响.研究表明,在相同的运行条件下功率密度和极化曲线表明CHBC反应器的产电性能最强;循环伏安曲线(Cyclic voltammetry curve,CV)则揭示了CHBC反应器电荷传递能力最强,导电性能最佳;此外,CHBC中硝酸盐氮(NO3--N)的降解速率最高,并且反应器中NO3--N降解过程中生成的亚硝酸盐氮(NO2--N)最少;最后,Illumina高通量测序结果表明,三组BES反应器中的微生物多样性有明显差异,其中CHBC中不仅微生物数量和种类最为丰富,而且反硝化菌的丰度也最高.%Three types of bioelectrochemical system (BES) reactors, including BC (biochathode), HBC (hydrogen facilitated biocathode) and CHBC (coupled hydrogen and biocathode), were constructed and investigated for their performance on hydrogenotrophic denitrification. Power density and polarization curve indicated that electron generation ability of CHBC was better than HBC and BC. Cyclic voltammetry curve (CV) showed that electron transfer ability of CHBC was the best, and the conductivity as well. In addition, nitrate removal efficiency of CHBC reached the highest, and the least nitrite generated during reduction process in CHBC comparing with other two groups. Through Illumina high-throughput sequencing, it was found that the reactor structure could affect the microbial diversity, not only the microbial diversity, but the denitrifier abundance in CHBC were extremely enriched than BC, and HBC.