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Environmental Impact Assessment of Low-Density Polyethylene and Polyethylene Terephthalate Containers Using a Life Cycle Assessment Technique

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Abstract

In the present study, the life cycle of two milk packaging containers (Polyethylene terephthalate PET and low-density polyethylene; LDPE) was assessed with an emphasis on different product-life scenarios in Iran. The functional unit was adjusted to work on one ton of plastic milk packaging containers. The system boundary included all life cycle stages, including resin production, packaging production, collection, transportation, and waste management (mechanical recycling, landfill, incineration). In the production sector, the resin was produced from raw materials and mechanical recycling was defined as producing granules from milk packaging containers. The granules obtained from recycling were used in the production of fruit baskets and disposable agricultural irrigation pipes. The first waste scenario included 10% recycling, 80% landfill, and 10% incineration. The second scenario consisted of 50% recycling, 20% landfill, and 30% incineration. The third scenario had 65% recycling, 10% landfill, and 25% incineration. Input data included using resources (water, raw materials), energy (electricity, fuels), and all emissions based on the function unit. The impact categories consisted of global warming, ozone depletion, fuel consumption, and toxicity to humans. SimaPro 9 software was run and the IMPACT + 2002 assessment method was employed to assess the environmental impact. According to the findings, the recycling process performed better than the landfill and incineration processes in all scenarios. The third scenario was determined as the most beneficent one in waste disposal of the two containers. In all effective categories, except air pollutants, the life cycle impact of PET was greater than that of LDPE. Furthermore, the life cycle impact of PET was greater than that of LDPE in all phases of the cycle except transportation.

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Data Availability

Not applicable.

Abbreviations

EIA:

Environmental Impact Assessment

LCA:

Life cycle assessment

PET:

Polyethylene terephthalate

PE:

Polyethylene

LDPE:

Low-density polyethylene

LCI:

Life cycle inventory

BOD:

Biochemical oxygen demand

COD:

Chemical oxygen demand

PTA:

Terephthalic acid

EG:

Ethylene glycol

DGT:

Diethylene glycol Terephthalate

NGL:

Natural gas liquids

NF:

Natural Gas Fractionation

GHG:

Greenhouse gas

MSW:

Municipal Solid Waste

GWP:

Global warming potential

LCIA:

Life Cycle Impact Assessment

CFC:

Chlorofluorocarbons

VOC:

Volatile Organic Compounds

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Acknowledgements

This study was extracted from a master’s thesis at Yazd Shahid Sadoughi University of Medical Sciences in 2021. The authors appreciate all those who contributed to the collection of data and completion of this research project.

Funding

This study was funded by Shahid Sadoughi University of Medical Sciences, Yazd, Iran.

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Contributions

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by TA, AAE, NJH and FM. The first draft of the manuscript was written by TA, NJH, FM, and HE. All authors commented on previous versions of the manuscript and read and approved the final manuscript.

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Correspondence to Ali Asghar Ebrahimi.

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Abbasi, T., Jaafarzadeh Haghighi Fard, N., Madadizadeh, F. et al. Environmental Impact Assessment of Low-Density Polyethylene and Polyethylene Terephthalate Containers Using a Life Cycle Assessment Technique. J Polym Environ 31, 3493–3508 (2023). https://doi.org/10.1007/s10924-023-02806-0

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