The U.S. Department of Energy and the U.S. Department of Agriculture have published the results of the Biodiesel Lifecycle Inventory Study which looked at energy resources consumed and air, water and solid waste emissions generated by petroleum diesel fuel and biodiesel. The intention of the three-and-a-half-year study was to provide a comprehensive "cradle to grave" environmental comparison of the two fuels in order to compare the total "lifecycle" costs and benefits of each.
It was determined that biodiesel has a total fossil energy efficiency ratio (i.e., total fuel energy / total fossil energy used in production, manufacture, transportation and distribution) four times greater than that of petroleum diesel fuel making biodiesel far more efficient in its use of non-renewable fossil fuels.
Other key findings showed that in comparison to petroleum diesel, biodiesel had:
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[Source: The Independent]
It was determined that biodiesel has a total fossil energy efficiency ratio (i.e., total fuel energy / total fossil energy used in production, manufacture, transportation and distribution) four times greater than that of petroleum diesel fuel making biodiesel far more efficient in its use of non-renewable fossil fuels.
Other key findings showed that in comparison to petroleum diesel, biodiesel had:
- 78 percent lower overall lifecycle carbon dioxide
- 35 percent lower overall lifecycle carbon monoxide
- 32 percent lower overall lifecycle particulate matter
- 68 percent lower overall bus exhaust-pipe emissions of PM10 (significant in relation to respiratory disease)
- 83.6 percent lower overall bus exhaust-pipe emissions of particulate matter soot
- 8 percent lower overall lifecycle sulphur oxides
- No bus exhaust-pipe emissions of sulphur oxides
- 3 percent lower overall lifecycle methane
- 37 percent lower overall lifecycle hydrocarbons
- 79 percent lower overall lifecycle production of wastewater
- 96 percent lower overall lifecycle production of hazardous solid wastes
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[Source: The Independent]
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