Environmental impact of different scenarios for the pyrolysis of contaminated mixed plastic waste

Garcia-Garcia, Guillermo; Martín-Lara, María Ángeles; Calero, Mónica; Blázquez, Gabriel

doi:10.1039/d3gc04396g

Cited by 12 publications

(1 citation statement)

References 34 publications

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“…Pyrolysis of waste and contaminated plastics can reduce the harmful impact on the environment to a great extent by reducing their global warming impact. Garcia et al [53] conducted an environmental impact assessment of contaminated waste plastics in three different scenarios, one where pyrolysis was conducted with combustion of the char and the other two where pyrolysis of the char with carbon dioxide and with potassium hydroxide was considered. In all three scenarios, the environmental impact was found to be less than landfilling.…”

Section: By-products Of Mwp Pyrolysis Processmentioning

confidence: 99%

Optimisation of Process Parameters to Maximise the Oil Yield from Pyrolysis of Mixed Waste Plastics

Faisal,

Rasul,

Chowdhury

et al. 2024

Sustainability

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The study sought to optimise process parameters of thermal pyrolysis of mixed waste plastic (MWP) to maximise pyrolytic oil yield. High-density polyethylene (HDPE), polypropylene (PP), and polystyrene (PS) were used as feedstocks for pyrolysis. Response surface methodology (RSM) and Box–Behnken design (BBD) were used to optimise the pyrolysis process. The optimisation was carried out by varying three independent variables, namely, reaction temperature (460–540 °C), residence time (30–150 min), and size of MWP feedstock (5–45 mm), to increase the liquid oil yield. A BBD matrix was used to generate the design of the experiments, and 15 experiments were conducted. The highest liquid oil yield of 75.14 wt% was obtained by optimising the operating parameters, which were a reaction temperature of 535.96 °C, a reaction time of 150 min, and a feedstock particle size of 23.99 mm. A model was developed to determine the relationships among the independent variables, and analysis of variance (ANOVA) was used to investigate their impact on maximising oil yield. ANOVA results showed that the temperature and residence time had the maximum impact on oil yield, followed by feedstock size. Physicochemical analysis of the properties of the plastic pyrolytic oil (PPO) revealed that the crude PPO obtained from the MWP had higher water (0.125 wt%) and sulfur content (5.12 mg/kg) and lower flash point (<20 °C) and cetane index (32), which makes it unsuitable for use as an automobile fuel. However, these issues can be resolved by upgrading the PPO using different posttreatment techniques, such as distillation and hydrotreatment.

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Section: By-products Of Mwp Pyrolysis Processmentioning

confidence: 99%

Optimisation of Process Parameters to Maximise the Oil Yield from Pyrolysis of Mixed Waste Plastics

Faisal,

Rasul,

Chowdhury

et al. 2024

Sustainability

View full text Add to dashboard Cite

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Critical Review of Heterogeneous Catalysts: Manufacturing of Fuel from Waste Plastic Pyrolysis

Jadhav,

Gardi,

Kadam

2024

Korean J. Chem. Eng.

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Sustainable transformation of end-of-life tyres into value-added products using thermochemical processes

Han,

Kumar,

Pei

et al. 2024

Carbon Res.

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The end-of-life tyres (ELTs) are currently critical environmental and societal problems due to their large quantity and chemical structure. The thermochemical process has been acknowledged as a viable option for extracting material and energy from ELTs. This review outlines the cutting-edge thermochemical techniques for recycling tyres, encompassing gasification, pyrolysis, and incineration. Additionally, it delves into the primary by-products, including oil, gas, and char. The advantages and disadvantages of each process are discussed in terms of energy efficiency, product yield, and environmental impact. The optimal reaction conditions for each product yield and quality are identified and described. The correlation between process parameters and product composition, yield and quality is clarified. Products after further processing are illustrated with specific examples. Future research directions such as upgrade of char product using low-temperature partial-oxidation process are given. This review is novel in its comprehensive synthesis of the latest advancements in thermochemical techniques for recycling ELTs, highlighting recent innovations in gasification, pyrolysis, and incineration methods. It is also a timely review due to the urgent need for sustainable waste management solutions amidst growing environmental concerns and stringent regulations on tyre disposal. Graphical Abstract

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Environmental impact of different scenarios for the pyrolysis of contaminated mixed plastic waste

Abstract: Pyrolysis is environmentally superior to landfilling for the treatment of contaminated mixed plastic waste.

Cited by 12 publications

References 34 publications

Optimisation of Process Parameters to Maximise the Oil Yield from Pyrolysis of Mixed Waste Plastics

Optimisation of Process Parameters to Maximise the Oil Yield from Pyrolysis of Mixed Waste Plastics

Critical Review of Heterogeneous Catalysts: Manufacturing of Fuel from Waste Plastic Pyrolysis

Sustainable transformation of end-of-life tyres into value-added products using thermochemical processes

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