侧流活性污泥水解工艺脱氮性能及功能微生物的研究

Study on the nitrogen removal performance and functional microorganisms of side-stream activated sludge hydrolysis process

通过构建实验室反应器,比较分析侧流活性污泥水解(SSH)工艺和常规厌氧/缺氧/好氧(A^(2)/O)工艺在不同进水负荷下的脱氮性能及功能微生物群落结构的变化规律。结果表明,在相同进水条件下,SSH反应器具有更好且更稳定的脱氮性能,72%的出水可达到《城镇污水处理厂污染物排放标准》(GB 18918—2002)一级A标准。提高进水污泥负荷可提升两种工艺的脱氮性能,而水力条件的改变会造成出水总氮和氨氮浓度的波动。微生物群落结构分析表明,SSH反应器中脱氮功能微生物的多样性和相对丰度均高于A^(2)/O反应器,这可能和其特殊的工艺构型有关。

In this study,the changes of nitrogen removal performance and functional microbial community in lab-scale side-stream activated sludge hydrolysis(SSH)and conventional anaerobic/anoxic/aerobic(A^(2)/O)processes were comparatively analyzed under different influent load conditions.The results showed that under the same influent condition,the SSH process had better and more stable nitrogen removal performance compared with A 2/O process,and 72%of the effluent could meet the Class A standard of“Discharge standard of pollutants for municipal wastewater treatment plant”(GB 18918-2002).The nitrogen removal performance of A^(2)/O and SSH processes could be improved by increasing the influent sludge load,while changes of hydraulic condition caused fluctuations in the total nitrogen and ammonia nitrogen concentrations in the effluent.The microbial community analysis showed that the diversity and relative abundance of functional microorganisms for nitrogen removal in SSH process were higher than those in A 2/O process,which might be related to its specific process configuration.