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Outline
An airlift transverse internal loop reactor (ATIR) was operated for the treatment of synthetic municipalwastewater. The nitrogen removal performance and internal recycle ratio of the ATIR with four different ratios of the cross-sectional areas of the downcomer to the riser (Ad/Ar) were investigated. The results indicated that the ATIR achieved high internal recycle ratio (52~176) by utilizing aeration kinetic energy. The efficient nitrogen removal was obtained at an Ad/Ar of 1:1.5 and a hydraulic retention time (HRT) of 9h, with the effluent total nitrogen of (8.12 ± 1.21) mg/L. Compared to the conventional internal recycle mode, the ATIR at this Ad/Ar demonstrated a 27.5% reduction in aeration rate. Furthermore, the ratio of specific nitrite utilization rate to specific ammonia utilization rate decreased from 1.31 to 0.95 and the abundance of nitrite-oxidizing bacteria (NOB-Nitrospira) decreased from 3.66% to 0.88%. Meanwhile, the simultaneous nitrification-denitrification efficiency increased to 26.77%, and the contribution of partial nitrification and denitrification to nitrogen removal corresponding increased to 16.71%. These indicate that spontaneous nitrite-oxidizing bacteria washout in the ATIR had occurred and the nitrogen removal pathway at an Ad/Ar of 1.5 tends towards simultaneous partial nitrification and denitrification.
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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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