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Outline
An airlift internal circulation reactor was used, and laboratory-cultivated full-nitrification granular sludge was inoculated into a continuous-flow reactor. During long-term operation, a suppression strategy based on a free nitrous acid (FNA) concentration of 150mg/L formed at pH 2.5 was applied to investigate the impact of high FNA concentrations under weak acid conditions on the nitritation of granular sludge. The results showed that this suppression strategy strongly inhibited both aerobic ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB), but AOB exhibited a greater recovery capacity than NOB, enabling the successful initiation of nitritation in the granular sludge reactor within one day. During stable operation, the ammonium removal rate (ARR) reached 0.2~0.5kg/(m3·d), and the nitrite accumulation efficiency (NAE) reached 100%. However, the granular sludge nitritation process exhibited a cyclical deterioration pattern during long-term operation, necessitating periodic repetition of the suppression strategy. Under weak acid conditions, the secretion of extracellular polymeric substances from granular sludge gradually decreased, leading to the continuous deterioration of its structure. High-throughput sequencing results indicated that throughout the duration of the experiment, the Nitrosomonas genus consistently dominated the AOB community in the granular sludge, while the relative abundance of the NOB genus Candidatus_Nitrotoga decreased from 5.2% to approximately 0%.
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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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