Co-Pyrolysis of Sewage Sludge, Two-Component Special Municipal Waste and Plastic Waste

Szabina Tomasek () and Norbert Miskolczi
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Szabina Tomasek: Faculty of Engineering, Research Centre of Biochemical, Environmental and Chemical Engineering, Department of MOL Hydrocarbon and Coal Processing, University of Pannonia, Egyetem utca 10, H-8200 Veszprém, Hungary
Norbert Miskolczi: Faculty of Engineering, Research Centre of Biochemical, Environmental and Chemical Engineering, Department of MOL Hydrocarbon and Coal Processing, University of Pannonia, Egyetem utca 10, H-8200 Veszprém, Hungary

Energies, 2024, vol. 17, issue 15, 1-15

Abstract: In this study, the co-pyrolysis of sewage sludge (SS), two-component special municipal waste (SMW) and plastic waste (Plastic) was studied using thermogravimetric equipment and a scaled-up tubular reactor. During the experiments, the effects of the raw material composition and pyrolysis temperature on the decomposition processes, the product yields and compositions were investigated. It was found that co-pyrolysis was a series of complex reactions and resulted in more volatile and lower residue yield than the pyrolysis of the individual raw materials. In some cases (e.g., 25%SMW + 75%Plastic, 25%SS + 75%Plastic, 50%SS + 50%Plastic blends), it also caused a higher synthesis gas yield and H 2 /CO ratio. During the thermogravimetric analysis, the beneficial effects occurred at lower temperatures, but in the scaled-up experiments, these effects only prevailed at 900 °C as a result of the larger amount of raw materials and the worse heat transfer. The produced gases can be characterized by a lower heating value of 17.3–35 MJ/Nm 3 . Therefore, they can be used for energetic purposes; however, before chemical use, further quality improvement is needed due to the lower H 2 /CO ratios.

Keywords: co-pyrolysis; sewage sludge; two-component special municipal waste; plastic waste; thermogravimetric and scaled-up experiments (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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