曝气条件对侧流活性污泥水解工艺脱氮性能和微生物的影响

通过改变传统厌氧/缺氧/好氧（A²/O）反应器和侧流活性污泥水解（SSH）反应器的曝气强度和溶解氧（DO）浓度，考察了曝气条件对脱氮性能的影响，并对比研究了微生物群落结构的变化规律。结果表明：相较于高DO阶段，两组反应器在中低DO阶段有更好的脱氮效果。在相同进水条件下，SSH反应器的脱氮性能优于A²/O反应器，且出水满足一级A标准。高通量测序结果表明，中低DO浓度更有利于脱氮微生物的生长。相对于A²/O反应器，SSH反应器中反硝化微生物的相对丰度更高。因此，合理控制曝气条件维持中低DO浓度有利于SSH工艺达到良好的脱氮性能及脱氮微生物的生长。

Effect of aeration condition on the nitrogen removal performance and microorganisms in side-stream activated sludge hydrolysis process

The effects of aeration conditions on the nitrogen removal performance in conventional anaerobic-anoxic-oxic (A²/O) and side-stream activated sludge hydrolysis (SSH) reactors were investigated by changing the aeration intensity and dissolved oxygen (DO) concentration, and the changes in microbial community structures were also studied. The results showed that the nitrogen removal performance of the two reactors in low and medium DO concentrations was better than that in high DO concentration. Under the same influent condition, the nitrogen removal performance of SSH reactor was better than that of A²/O reactor, and its effluent concentration met the Class A standard. High-throughput sequencing results showed that low to medium DO concentrations were more beneficial for the growth of the microorganisms for nitrogen removal. A higher relative abundance of denitrifying microorganisms was observed in SSH reactor compared to A²/O reactor. Therefore, Maintaining low to medium DO concentrations of aeration conditions is conducive to the SSH process to achieve effective nitrogen removal performance and the growth of microorganisms for nitrogen removal.