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Given high concentrations of chemical oxygen demand (COD), ammonium nitrogen (NH4+-N), suspended solids (SS), and poor biodegradability of concentrated swine farm wastewater, a combined treatment process of "pretreatment-biochemical treatment-advanced treatment" was employed in this study, specifically designed as "solid-liquid separation → anaerobic fermentation → A/O → MBR." By comparing influent characteristics and pollutant removal efficiency between summer and winter, the energy consumption and greenhouse gas (GHG) emission profiles of the system were systematically analyzed. The average effluent COD and TN in the summer were significantly lower than those in the winter (711.21mg/L and 61.78mg/L, respectively), indicating that low temperature significantly inhibit the treatment efficiency. The A/O unit dominated energy usage, with a consumption of 7.65 (kW·h)/m3, accounting for 56.48% of total energy demand. The annual GHG emissions totaled 1364.41t CO2-eq, with an emission intensity of 15.53kg CO2-eq/m3. The emission intensities per unit COD and TN removed were 1.33kg CO2-eq/kg CODremoved and 10.89kg CO2-eq/kg TNremoved, respectively. Further analysis revealed that external electricity consumption contributed to 72.98% of total GHG emission, followed by nitrous oxide (N2O) release (25.99%). Through the regulation of seasonal process parameters, the development of multi-mode operation strategies, and the integration of online monitoring technologies, the precise control of the treatment process is optimized to achieve the goals of energy saving, consumption reduction, and low-carbon operation.
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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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