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To investigate the overall effects of carbon source types on wastewater treatment plant (WWTP) performance, this study compared the impacts of three external carbon sources—a composite carbon source, sodium acetate and glucose—on the overall operational process. The results demonstrated that different carbon sources led to variations in the metabolic performance of heterotrophic microorganisms. Under the influence of the three carbon sources, the heterotrophic yield coefficients YH were 0.703 (composite carbon source), 0.676 (sodium acetate), and 0.889 (glucose), respectively. The heterotrophic decay coefficients bH were 0.405, 0.433 and 0.775d-1, while the maximum heterotrophic growth rates μmH were 2.146, 3.071 and 6.078d-1 respectively. Using GPS-X software, a model of the target WWTP was constructed and calibrated. The kinetic parameters under each carbon source were incorporated into the model for simulation. The results indicated that changes in kinetic parameters directly affected the treatment efficiency, energy consumption, sludge production, and greenhouse gas (GHG) emissions of the WWTP. In terms of total nitrogen removal efficiency, the composite carbon source and sodium acetate exhibited more significant advantages, albeit with increased energy consumption and GHG emissions. In contrast, while glucose was more energy-efficient and reduced carbon emissions, it resulted in lower nitrogen removal efficiency and potentially higher sludge production. After considering market pricing, the composite carbon source was found to be a more competitive option for denitrification.
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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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