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In view of the accumulation of nitrite in the effluent of denitrification biofilter in water recycling plant, nitrite accumulation in denitrification filter units of 4recycled water plants was investigated. Two denitrification filter process units of recycled water plant, G（with nitrite accumulation）and W（without nitrite accumulation）, were selected as research objects to explore the causes of nitrite accumulation under the condition of low carbon to nitrogen ratio influent. The results showed that operating parameters such as backwashing cycle and mode of filter had little effect on nitrite accumulation. The sludge denitrification rates of plants G and W were 0.51 and 0.92 mgNO3/（mgVSS·d）, respectively. The accumulation of nitrite in the effluent from the filter of Plant G was due to the weak denitrification ability of microorganisms in the filter. When nitrate nitrogen was present in the denitrification process, the denitrification rate of nitrite in the sludge of Plant G was 75% lower than that of plant W, and it was easier to produce nitrite accumulation. When the sludge biomass of Plant G was increased to twice the concentration of plant W, the maximum nitrite denitrification rate still couldn’t reach the level of plant W, so the biomass was not the main reason for the accumulation of nitrite in Plant G. The results of microbial community structure analysis showed that the abundance of Methylotenera in the filter of W plant was 12.9% higher than that of G plant. The denitrification process was mainly completed by denitrifying bacteria using methyl type nutrition, which was the cause of nitrite accumulation happening or not, and it was not necessary to consider the influence of bacteria species using other organic types on nitrite accumulation.
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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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