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This study employed municipal sludge (MS), polypropylene (PP), and polyethylene terephthalate (PET) as feedstocks to investigate the effects of plastic co-feeding on the pyrolysis characteristics and product distribution of MS. The mass changes and kinetic properties associated with the co-pyrolysis of MS/PP and MS/PET blends were obtained by thermogravimetric analysis coupled with the Coats-Redfern integral method. Additionally, the compositions of the resulting co-pyrolysis products were analyzed by pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). The results indicated that the synergistic effects observed during the co-pyrolysis of MS/PP and MS/PET shifted the pyrolysis process toward lower temperatures and enhanced the overall conversion efficiency. The apparent activation energy required for the co-pyrolysis of both MS/PP and MS/PET blends was lower than that for MS mono-pyrolysis. Moreover, the addition of PP and PET led to a more pronounced reduction in the apparent activation energy associated with the pyrolysis of heavy molecular-weight species in the high-temperature region. Compared to the mono-pyrolysis of MS, co-pyrolysis of MS/PP increased the relative contents of C30+ organics and aliphatic hydrocarbons, whereas co-pyrolysis of MS/PET not only primarily enhanced the relative yield of C10~C15 products, but also increased the relative contents of alcohols, aliphatic and aromatic hydrocarbons.
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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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