亚硝酸盐不同生成方式对短程硝化反硝化除磷颗粒系统的影响

Effects of Different Nitrite Generation on the Short-cut Nitrification Denitrifying Phosphorus Removal Granules System

为了探究亚硝酸盐生成方式对短程硝化反硝化除磷颗粒系统的影响,采用2组同规格SBR反应器分别在连续和间歇曝气方式下使亚硝酸盐连续生成和间歇生成,考察其运行过程中脱氮除磷效果、污泥物理特性和微生物群落结构.结果表明,亚硝酸盐间歇生成后随即消耗,具有更好和更稳定的脱氮除磷性能,特别在TN去除上,第72 d后TN平均去除率为92.07%.碳源利用效率(以P/COD计)集中在0.21~0.22 mg·mg^(-1),碳源利用充分,进一步促进反硝化除磷.颗粒粒径分布集中,大小均匀,具有规则的形状和清晰的边界.微生物群落分析表明,亚硝酸盐间歇生成的系统微生物群落丰富度和多样性更高,同时富集了更多DPAOs菌属(Dechloromonas和Pseudomonas),与Nitrosomonas共同作用使短程硝化与反硝化除磷达到动态平衡,实现系统稳定运行.

To explore the effects of nitrite generation on the system of short-cut nitrification denitrifying phosphorus removal granules,nitrite was produced continuously and intermittently,under continuous and intermittent aeration,in two groups of SBR reactors of the same size.The effects of nitrogen and phosphorus removal,physical characteristics of the sludge,and microbial community structure were investigated.Nitrite was consumed immediately after intermittent production,with better and more stable nitrogen and phosphorus removal performance.In particular,the average rate of TN removal was 92.07% after 72 days.The utilization efficiency of the carbon source(by P/COD) was concentrated at 0.21-0.22 mg·mg^(-1),to ensure full utilization of the carbon source and to further promote denitrification and phosphorus removal.Particle sizes were uniform and showed concentrated distribution,with particles exhibiting regular shapes and clear boundaries.Microbial community analysis showed that the abundance and diversity of microbial communities were higher in the intermittent nitrite system and more enriched in DPAOs genera(Dechloromonas and Pseudomonas).The combination of DPAOs genera and Nitrosomonas resulted in a dynamic balance and stable operation of the short-cut nitrification and denitrifying phosphorus removal system.