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In a sequencing batch reactor with alternating anaerobic/aerobic operation, activated sludge from an oxidation ditch was used as the inoculated sludge for culturing poly-phosphate biofilm enrichment. The potential functions of GAOs in the biofilm phosphorus enrichment system were investigated by examining the effects of the changes in the abundance of glycogen-accumulating organisms（GAOs）in the biofilm on the phosphorus enrichment performance and the metabolic characteristics of the microbial community. The results showed that GAOs became the dominant organisms in the enrichment culture of phosphorus-accumulating biofilm, but they did not adversely affect the phosphorus removal and enrichment of the biofilm system. Due to the significant increase of PHA metabolic activity and poly-P metabolic activity in individual cells of phosphorus-accumulating organisms（PAOs）, the biofilm community as a whole was dominated by the phosphorus accumulating metabolism（PAM）. GAOs as a dominant bacterial genus in the system, might obtain the reducing power（NADH）required for synthesizing PHA through EMP metabolism, which could provide sufficient energy reserve for the absorption of phosphorus by the PAOs in aerobic conditions, and thus stimulate the phosphorus removal and enrichment effect in the biofilm system. The inorganic phosphorus transport system（pst）and poly-P synthesizing genes（ppk）were up-regulated, so that the biofilm system showed good phosphorus removal and enrichment ability, and the GAOs（Candidatus Competibacter）, as a potential denitrifying bacterium, could synchronize with the aerobic denitrification in the biofilm phosphorus-enrichment system.
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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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