提高SBR好氧颗粒污泥脱氮除磷性能的策略调控

室温下接种成熟好氧颗粒污泥于SBR反应器中，以实际生活污水为进水基质，采用梯度进水联合优化A/O/A时间配比策略以期提高污泥的脱氮除磷效果.结果表明，缺氧时间由0.5h延长至1.5h时，能同时保证脱氮除磷高效进行.此时A/O/A时间比为1：1.6：1，平均TN去除率提高至81.27%，平均TP去除率保持90%以上，平均COD去除率保持在85%以上.同时，同步硝化反硝化（SND）率降低至25.24%，缺氧吸磷比例由0.43%上升至2.81%，进而说明此A/O/A时间比下反硝化糖菌（DGAOs）的反硝化作用对脱氮的贡献增加.缺氧时间延长至2h，A/O/A时间比为3：5：4时，过度缺氧导致微生物内源呼吸和丝状菌繁殖，平均TN、TP去除率降低至51.48%、72.46%.缺氧时间为1.5h时，MLSS为3501mg/L较低，但MLVSS/MLSS （f）升高至0.95，说明淘洗掉了非功能菌，使脱氮除磷功能菌大量生长.随缺氧时间延长至1.5h，即A/O/A时间比为1：1.6：1，PN/PS增加至6.89，故颗粒稳定性不断增强，在1h以内缺氧时间延长对LB-EPS影响更大且对EPS含量影响不大，超过1h则对TB-EPS影响更大且EPS增加至126.16mg/g，继续延长缺氧时间至2h时，由于微生物内源呼吸大量死亡释放出PN、PS，故EPS含量增加至479.92mg/g.

Strategy regulation to improve the nitrogen and phosphorus removal performance of SBR aerobic granular sludge

Mature aerobic granular sludge was inoculated into the SBR reactor at room temperature, and the actual domestic sewage was used as the influent matrix, and the A/O/A time ratio strategy was combined with gradient feeding to improve the denitrification and phosphorus removal effect of the sludge. When the anoxic time was extended from 0.5h to 1.5h, the efficient denitrification and phosphorus removal can be ensured at the same time. At this time, the A/O/A time ratio was 1:1.6:1 which made the average TN increase to 81.27%, the average TP removal rate to above 90%, and the average COD removal rate to above 85%. Meanwhile, the simultaneous nitrification and denitrification (SND) rate decreased to 25.24%, and the ratio of anoxic and phosphorus uptake increased from 0.43% to 2.81%, which further indicated that the denitrification contribution of denitrifying sugar bacteria (DGAOs) to denitrification increased at this A/O/A time ratio. When the anoxic time was extended to 2h and the A/O/A time ratio was 3:5:4, excessive hypoxia led to the endogenous respiration of microorganisms and the reproduction of filamentous bacteria. The average removal rates of TN and TP decreased to 51.48% and 72.46%, respectively. When the anoxic time was 1.5h, the MLSS was 3501mg/L which was lower but the MLVSS/MLSS(f) increased to 0.95, indicating that the non-functional bacteria were washed away. The bacteria with nitrogen and phosphorus removal functions can grow in large quantities. With an extension of the anoxic time to 1.5h (or the A/O/A time ratio is 1:1.6:1), the PN/PS increases to 6.89, so the stability of the particles was continuously enhanced. The extension of the hypoxia time to within 1h had a greater impact on LB-EPS and EPS but little effect on TB-EPS. The hypoxia time more than 1h had a greater effect on TB-EPS and can make EPS increase to 126.16mg/g. When the hypoxia time was extended to 2h, the EPS content increased to 479.92mg/g due to the massive death of microbes that intake PN and PS released from endogenous respiration of microorganisms.