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In order to ensure the normal operation of wastewater treatment plants and prevent equipment failures，an improved FMEA risk assessment model was proposed. Firstly，the FMEA method was used to identify the failure modes of wastewater treatment plant equipment，and it was combined with PFS to portray the uncertainty assessment information. Secondly，the subjective and objective weights were calculated using the stepwise weight assessment ratio analysis (SWARA) method and the maximum deviation method，and the comprehensive weights of the three risk factors were calculated through the game theory combination weights. Thirdly，the multi-objective optimization on basis of ratio analysis (MOORA) method was used for the equipment failure mode risk ranking. Finally，taking Changchun City Z wastewater treatment plant equipment failure risk assessment as an example，the model proposed in this paper was compared with traditional FMEA，Pythagorean fuzzy technique for order preference by similarity to ideal solution (PF-TOPSIS)，and Pythagorean fuzzy VlseKriterijumska Optimizacija I Kompromisno Resenje (PF-VIKOR)，and the feasibility and effectiveness of the model were verified. The results show that the top 3 failure modes of wastewater plant equipment are that the grit extracted by the grit remover contains excessive organic matter，the diaphragm is dislodged or broken，and large foreign objects enter the pump.
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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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