不同好氧/缺氧时长联合分区排泥优化生活污水短程硝化反硝化除磷颗粒系统运行

采用生活污水接种人工配水下成熟短程硝化反硝化除磷颗粒，通过不同好氧/缺氧时长联合分区排泥优化调控短程硝化反硝化除磷系统运行.结果表明，调控好氧/缺氧时长联合分区排泥可实现系统的稳定运行.后期稳定期出水COD浓度在50mg·L^-1以下，出水TN浓度低于15mg·L^-1，TN去除率达83%左右并保持平稳，出水P浓度均在0.5mg·L^-1以下，平均去除率为93.72%.同时，分区排泥（70%顶部污泥和30%底部污泥）可作为筛选微生物的途径，维持了良好的亚硝化和除磷性能，使粒径分布更为集中，并保证氨氧化菌（ammonia oxidizing bacteria，AOB）和反硝化聚磷菌（denitrifying phosphate accumulating organisms，DPAOs）的生长优势.缺氧时长的增加提高了缺氧异养菌的生长速率，使得缺氧异养菌分泌出更多的EPS，确保了颗粒污泥性状的改善和后续维持稳定.

Combining Different Aerobic/Anoxic Durations with Zoned Sludge Discharge to Optimize Short-cut Nitrification Denitrifying Phosphorus Removal Granules in Domestic Sewage

In this study, domestic sewage was used to inoculate mature short-cut nitrification denitrifying phosphorus removal particles, which were cultivated and matured under artificial water. The operation of the short-cut nitrification denitrifying phosphorus removal system was optimized using different aerobic/anoxic durations combined with zoned sludge discharge. The results showed that regulating the aerobic/anoxic duration, in combination with zoned sludge discharge, can realize the stable operation of the system. In the later stable period, the effluent COD concentration was below 50 mg·L^-1, the effluent TN concentration was below 15 mg·L^-1, the TN removal rate reached about 83% and remained stable, the effluent P concentration was below 0.5 mg·L^-1, and the average P removal rate was 93.72%. At the same time, zoned sludge discharge (70% top sludge and 30% bottom sludge) can be used to screen out microorganisms, maintain good nitrosation and phosphorus removal performance, limit the particle size distribution, and ensure the growth advantages of AOB and DPAOs. Increases in the anoxic duration improved the growth rate of anoxic heterotrophic bacteria, causing them to secrete more EPS and ensuring granular sludge improvements and continued stability.