厌氧推流进水对反硝化除磷好氧颗粒污泥系统的影响

实际生活污水成分复杂,且碳氮比较低,而厌氧推流进水可以通过提供局部高底物浓度来加强好氧颗粒污泥对进水中COD的利用.实验采用间歇曝气的方式在序批式反应器（SBR）中培养好氧颗粒污泥,以实际生活污水为进水,接种污水厂污泥.R1采用厌氧快速进水,R2采用厌氧推流进水,探究不同进水模式对生活污水好氧颗粒污泥系统的影响.结果表明,快速厌氧进水条件下,R1中更早出现颗粒结构,但在运行71 d时出现颗粒破裂的现象;应用厌氧推流进水模式的R2生成的颗粒结构较R1的更为致密,颗粒表面更加光滑,且反硝化聚磷菌（DPAO）的富集效果更好.最终R1和R2反应器内DPAO占聚磷菌（PAO）的比例分别为14.17%和22.07%.结果表明,厌氧推流进水模式能够加强颗粒污泥对进水中COD的利用,有利于富集DPAO,生成结构更加致密稳定的颗粒,实现"一碳两用",获得更好的脱氮除磷效果.

Effect of Anaerobic Plug-flow on Nitrification Denitrifying Phosphorus Removal Aerobic Granular Sludge with Intermittent Aeration

Actual domestic sewage has a complex composition and relatively low carbon and nitrogen content. Anaerobic plug-flow influent can enhance the utilization of COD by aerobic granular sludge by providing a locally high concentration of substrate. In this study, intermittent aeration was used to cultivate aerobic granular sludge in a sequencing batch reactor (SBR), and actual domestic sewage was used as the feed water to inoculate the sewage plant sludge. In the R1 experiment, rapid anaerobic feeding was adopted, while in R2, anaerobic plug-flow feeding was adopted, to explore the impact of different feeding modes on the aerobic granular sludge system of domestic sewage. Under rapid anaerobic feeding in R1, the particle structure appeared earlier, but particle breakage occurred after 71 days of operation; the particle structure generated in R2 was denser than that of R1, the particle surfaces were smoother, and the denitrifying phosphorous accumulating organisms (DPAO) had a more enriching effect. In the final R1 and R2 reactors, the proportion of DPAO to phosphorous accumulating organisms (PAO) was 14.17% and 22.07%, respectively. The results show that the anaerobic plug-flow feeding mode can enhance the use of influent COD by granular sludge, which is conducive to enriching DPAO, generating denser and more stable particles, realizing "one carbon dual purpose" operation, and removing more nitrogen and phosphorus.