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Conversion of peach endocarp and polyethylene residue by the co-pyrolysis process

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Abstract

The south of Brazil has a high production of peaches which generates the stone as residue. The recycling of biomass and plastic waste is a challenge that must be overcome. Therefore, co-pyrolysis emerges as a possibility for joint conversion of peach stone and plastic bags into value-added products. Thus, the objective is to obtain new products, emphasizing the organic fraction of the bio-oil obtained under the best experimental conditions, and to characterize it by GC-MS. The experiments provided a three-phase bio-oil: two organic phases with different densities and an aqueous phase. It was observed that the central point experiment (temperature at 500 °C and blend composition, % peach stone/polyethylene, 80/20) generated the highest yield of bio-oil. However, the experiment at the lowest temperature and with greater addition of plastic waste produced a higher organic fraction. Using gas chromatography, 161 chemical compounds were identified in the denser organic phase, emphasizing the phenols. In the lighter organic fraction, hydrocarbons were the majority among the 70 compounds identified. The results suggest that the interaction between biomass and polyethylene influences the characteristics of the products obtained, since polyethylene acts as dispersant and as hydrogen donor. Co-pyrolysis, in this research, proves to be efficient and viable, allowing the joint destination of those environmental liabilities.

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The data generated or analyzed during this study is included in this article and its supplementary information files.

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Acknowledgements

This study acknowledges the agro-industry for providing the biomass sample; the Instituto Federal Sul-Rio-Grandense (IFSUL) for the environments used to develop the research; the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq), and Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) for the scholarships.

Funding

The Instituto Federal de Educação, Ciência e Tecnologia Sul-rio-grandense (IFSUL) contributed with the physical structure and materials needed to carry out the analyses; the Conselho Nacional de DesenvolvimentoCientífico e Tecnológico (CNPq) and the Fundação de Amparo à Pesquisa do Estado do Rio Grande do Sul (FAPERGS) provided a research grant at the level of scientific initiation to the collaborating author C.S.D.

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L.S.V: conceptualization, methodology, data curation, project management, writing — original draft. C.S.D: research, data curation, copywriting — proofreading and editing. D.G.S: methodology, validation, formal analysis, writing — proofreading and editing. P.J.S.F: supervision, resources, data curation, project management, writing — proofreading and editing.

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Correspondence to Lidiane Schmalfuss Valadão.

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The authors declare no competing interests.

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Responsible editor: Santiago V. Luis

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Valadão, L.S., dos Santos Duarte, C., de los Santos, D.G. et al. Conversion of peach endocarp and polyethylene residue by the co-pyrolysis process. Environ Sci Pollut Res 29, 10702–10716 (2022). https://doi.org/10.1007/s11356-021-16379-9

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  • DOI: https://doi.org/10.1007/s11356-021-16379-9

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