多次进水-曝气的好氧颗粒污泥系统实验

Aerobic Granular Sludge System with Multiple Influent-Aeration Operation Strategy

选用SBR反应器R1和R2接种污水处理厂活性污泥,以生活污水为进水,分别采用一次进水-曝气策略和多次进水-曝气策略运行,对运行过程中粒径变化及处理效果进行研究.实验表明,运行56和39 d后R1和R2成功实现污泥颗粒化;稳定运行后R1和R2中出水COD、 TN和TP浓度(mg·L^-1)分别为29.7、 13.7、 0.31和19.2、 8.1、 0.37,去除率分别为87.7%、 75.6%、 95.1%和90.1%、 85.6%、 94.2%,其中颗粒平均粒径达到740μm和791μm.结果表明,相同运行时间下,R2中的出水NO3^--N浓度和出水TP浓度低于R1.运行后期,R1和R2中DPAO占全部PAOs的比值由最初11.17%分别增至25.47%和34.08%.与一次进水-曝气策略相比,采用多次进水-曝气策略运行在启动初期系统内NO3^--N浓度较低,PAOs受到的冲击更小,DPAO富集情况更好,除磷性能更好,利于AGS的形成.

SBR reactors R1 and R2 were used to inoculate activated sludge from a sewage treatment plant, and domestic sewage was used as the influent. The operation was carried out using a single and multiple influent-aeration operation strategy, respectively, and the particle size change and removal effect during the operation was studied. The results show that R1 and R2 successfully achieved sludge granulation after 56 days and 39 days of operation, respectively. The concentrations(mg·L^-1) of chemical oxygen demand, total nitrogen, and total phosphorus(TP) in the effluent of R1 and R2 after stable operation were 29.7, 13.7, 0.31, 19.2, 8.1, and 0.37, respectively. The removal rates were respectively 87.7%, 75.6%, 95.1%, and 90.1%, 85.6%, and 94.2%, and the average particle size of the particles reached 740 μm for R1 and 791 μm for R2. The results showed that for the same running time, the effluent NO3^--N concentration and TP concentration in R2 were lower than those in R1. In the later stage of operation, the ratio of denitrifying phosphorus-accumulating organisms(DPAO) to total phosphorus-accumulating organisms(PAOs) in R1 and R2 increased from an initial 11.17% to 25.47% and 34.08%, respectively. Compared with the one influent-aeration operation strategy, the multiple influent-aeration operation strategy had a lower concentration of NO3^--N in the initial stage of the startup, the PAOs received less impact, the DPAO enrichment was better, the phosphorus removal performance was better, and it helped to form aerobic granular sludge.