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Outline
The effect of scrap iron on the nitrogen removal performance of theanaerobic ammonium oxidation (ANAMMOX) system under different salinity influents was investigated using anUpflow Anaerobic Sludge Blanket (UASB) reactor. The results showed that scrap iron had a positive effect on enhancing the nitrogen removal efficiency of the ANAMMOX process. Under salinity conditions ranging from 2.75% to 3%, the nitrogen removal rate (NRR) increased from 0.39±0.12kg/(m3·d) to 2.88±0.09kg/(m3·d). However, when the salinity reached 3.5%, the system collapsed. With the addition of scrap iron, the specific anammox activity (SAA) first increased and then decreased at 3.5% salinity. Extracellular Polymeric Substances (EPS) analysis indicated that the addition of scrap iron contributed to a decrease in theProtein/polysaccharide(PN/PS)ratio, promoting the formation of dense granular sludge. Microbial community analysis revealed that high salinity reduced the abundance of AnAOB(CandidatusKuenenia) in the reactor. Notably, a potentially novel AnAOB (Brocadiaceaeunclassified), consistently dominated the community (accounting for 54.1%), suggesting that this strain may play a key role in maintaining nitrogen removal performance under high-salinity conditions. The results of this paper could provide theoretical support for the treatment of high-salt wastewater by the ANAMMOX process.
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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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