Abstract
The conversion of plastic solid waste and waste cooking oil into useful alternative fuels, e.g., waste plastic fuel and biodiesel, respectively, helps mitigate waste accumulation and minimize the dependence on fossil fuels, like ultra-low sulfur diesel (aka diesel). This study aims to assess the potential environmental impacts of both waste-derived fuels with the help of a scalable Well-to-Exhaust life-cycle analysis (functional unit = 1 kg of fuel) conducted within a university campus (control volume) with well-defined boundaries. The performance of both fuels is assessed on a Well-to-Pump (fuel fabrication) and Pump-to-Exhaust (end-use) basis, and their summation is used to present the life cycle impact of each fuel comparative to diesel. The findings reveal that diesel worsens the local air quality and significantly contributes to global warming. In contrast, waste plastic fuel appears to have a relatively lower impact on the air quality index and global warming, suggesting that its production near urban areas could help mitigate plastic waste accumulation and environmental pollution while boosting the local economy. On the other hand, biodiesel emerges as a relatively cleaner fuel and shows significantly lower emissions, especially during its fabrication. Therefore, its manufacture and end-use can be decoupled to enhance the economics of the process. Finally, its lowest overall carbon dioxide emissions hint that its use could be instrumental in lowering greenhouse gas emissions.
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Abbreviations
- AQI:
-
Air quality index
- ASTM:
-
American Society for Testing and Materials
- BSFC:
-
Brake-specific fuel consumption
- CFR:
-
Code of Federal Regulations
- CH4 :
-
Methane
- CI:
-
Compression–ignition
- CO:
-
Carbon monoxide
- CO2 :
-
Carbon dioxide
- EPA:
-
Environmental Protection Agency
- EtW:
-
Exhaust-to-Wheels
- FID:
-
Flame ionization detector
- FTIR:
-
Fourier transform infrared spectroscopy
- FU:
-
Functional unit
- GHG:
-
Greenhouse gases
- GREET:
-
Argonne National Laboratory Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation
- GWP:
-
Global warming potential
- H2O:
-
Water
- HCHO:
-
Formaldehyde
- ISO:
-
International Organization for Standardization
- LCA:
-
Life cycle analysis (or assessment)
- LCIA:
-
Life cycle impact analysis
- LDDV:
-
Light-duty diesel vehicle
- LHV:
-
Lower heating value
- MECHO or CH3CHO:
-
Acetaldehyde
- MPG:
-
Miles per gallon
- N2O:
-
Nitrous oxide
- NO:
-
Nitric oxide
- NO2 :
-
Nitrogen dioxide
- NOx :
-
Nitrogen oxides
- NRP-ULSD:
-
Non-recycled plastic ultra-low sulfur diesel
- O3 :
-
: Ozone
- PM:
-
Particulate matter
- PSW:
-
Plastic solid waste
- PtE:
-
Pump-to-Exhaust
- PtW:
-
Pump-to-Wheels
- ROHR:
-
Rate of heat release
- SOx :
-
Sulfur oxides
- TDC:
-
Top dead center
- THC:
-
Total hydrocarbon
- ULSD:
-
Ultra-low sulfur diesel
- VOC:
-
Volatile organic compounds
- WCO:
-
Waste cooking oil
- WPF:
-
Waste plastic fuel
- WtP:
-
Well-to-Pump
- WtW:
-
Well-to-Wheels
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Acknowledgements
The authors would like to thank Dr. Edward F. Peltier, Dr. Arkan D. Jalal, Mr. Daniel Tabakh, Mr. Charu Vikram Srivatsa, Mr. Emilio Alverio, and Mr. Jesse Copp for providing useful inputs at various stages of the current study.
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Shah Saud Alam, Preetham Reddy Churkunti, and Christopher Depcik performed conceptualization; Shah Saud Alam and Preetham Reddy Churkunti were involved in methodology; Shah Saud Alam and Preetham Reddy Churkunti contributed to formal analysis and investigation; Shah Saud Alam done writing—original draft preparation; : Christopher Depcik and Shah Saud Alam were involved in writing—review and editing; Christopher Depcik done supervision.
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Alam, S.S., Churkunti, P.R. & Depcik, C. Comparison of waste plastic fuel, waste cooking oil biodiesel, and ultra-low sulfur diesel using a Well-to-Exhaust framework. Int. J. Environ. Sci. Technol. 19, 5857–5876 (2022). https://doi.org/10.1007/s13762-021-03552-3
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DOI: https://doi.org/10.1007/s13762-021-03552-3