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This study integrated biological phosphorus removal into the PN-SAEPD process, establishing a PNPR-SAEPD system. To allocate the limited carbon source reasonably, the experiment gradually adjusted the two-stage anaerobic time ratio from 3:1 (90min:30min) in the S1stage to 1:1 (60min:60min) in the S2 stage, and then to 1:3 (30min:90min) in the S3stage. The study investigated the impact of the two-stage anaerobic time ratio on the conversion of influent organic matter, nitrogen and phosphorus removal performance, and microbial community structure of the PNPR-SAEPD system. The results showed that in the S2 stage, with a two-stage anaerobic time ratio of 1:1, the allocation of inflow organic carbon sources was most reasonable. The average COD consumed by the SAEPD and PNPR reactors for storing internal carbon sources was (89.3±8.4)mg/L and (82.6±7.7)mg/L, respectively. The phosphorus removal contribution of the PNPR reactor was (79.1%±8.5%), creating phosphorus starvation conditions for the subsequent anaerobic stage of the SAEPD reactor. The contribution of DPAOs in the SAEPD reactor to the storage of internal carbon sources was only 15%, consuming (10.1±4.0)mg/L of COD. The relative abundance of DPAOs dropped to 3.01%, enhancing the synergistic denitrification of DGAOs and AnAOB. Integrating biological phosphorus removal into the PN reactor improved the stability of short-cut nitrification, with the relative abundance of NOB gradually decreasing from 3.86% to 0.64% and NAR maintaining at around (82.1%±4.0%). In the S2stage, the superior PN performance of the PNPR reactor and the EPD pathway dominated by DGAOs in the SAEPD reactor provided sufficient electron acceptors for AnAOB. The anaerobic ammonium oxidation denitrification contribution remained at about (81.8%±3.6%), the total nitrogen removal rate was maintained at around (88.3%±1.6%), and the effluent total nitrogen concentration was below 10mg/L. The TP removal rate could reach up to 93.7%, and the effluent TP concentration was basically reduced to below 0.5mg/L.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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