Full
Outline
To precisely control the denitrification process such that NO3--N is reduced solely to NO2--N without further reduction to N2, short-term aeration was implemented to enhance the nitrate-to-nitrite transformation ratio (NTR) of denitrifying phosphorus-accumulating organisms (DPAOs). The results demonstrated that after aeration intensification, phosphorus removal efficiency in the reactor improved (from 84.62% to 88.34%). When aeration durations were set at 5, 10, and 15minutes, the NTR values reached 36.09%, 89.14%, and 91.86%, respectively. However, extending aeration to 20minutes resulted in elevated effluent nitrate concentrations (10.11mg/L). As aeration duration increased, the content of pre-anoxic electron donors (PHBs) gradually diminished, which was identified as the primary reason for nitrite accumulation. Furthermore, aeration induced an increase in the relative abundance of DPAOs while decreasing that of endogenous denitrifying glycogen-accumulating organisms (DGAOs). Based on the outcomes of the partial denitrification coupled with phosphorus removal (PDPR) process, the feasibility of implementing the N-PDPR-Anammox process in practical engineering applications was discussed.
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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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