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To explore the influence of trace elements and change in environmental conditions at low temperature on the nitrification performance of biofilm reactor, a simulated wastewater containing NH4+-N was treated. The effects of trace elements, low temperature, aeration rate and flow rate on nitrification performance of the biofilm reactor were studied. The microbial community structure was analyzed by 16S rRNA high-throughput sequencing technique. The results showed that trace elements significantly affected the nitrification performance (P<0.0001). After adding trace elements to the influent, the removal load of NH4+-N increased from 0.93kg/(m3·d) to 1.63kg/(m3·d) and the generation load of NO3--N increased from 0.23kg/(m3·d) to 1.21kg/(m3·d). Low temperature can affect nitrifying bacteria. Nitrite oxidizing bacteria (NOB) are sensitive to low temperature shock, while ammonia oxidizing bacteria (AOB) are resistant to it. The decrease in aeration rate led to a lack of dissolved oxygen (DO) in the reactor, which further affected the nitrification performance. The change in flow rate had no significant effect on the nitrification performance. Analysis of the microbial community structure at low temperatures showed that the nitrobacteria of Nitrosomonas and Nitrospira were enriched during operation, which ensured that the reactor can still have stable nitrification performance. The research provides experimental evidence and theoretical guidance for improving the nitrification performance and enhancing the low-temperature resistance of biofilm reactor in wastewater nitrification treatment practice.
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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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