They found that using biodiesel in construction vehicles delivers promising environmental benefits both in terms of reduced exhaust emissions and in terms of the reductions in fuel cycle emissions.
By developing an updated and modified life cycle inventory to estimate fuel cycle energy consumption and emissions, they found key improvements including an update of combustion emission factors based on 2006 US national average emission rates. It found that life cycle fossil energy reductions are estimated at nine per cent for B20 and 42 per cent for B100 against petroleum diesel based on the current national energy mix.
There were significant reductions in exhaust emissions by using B20. Local urban exhaust emissions are estimated to be 24 per cent lower for HC; 20 per cent lower for CO; 17 per cent lower for PM and 0.9 per cent lower for NOx.
When summarising the study, researchers commented that the air quality benefits of using biodiesel are dependent on geographic locations of the fuel production and on the vehicles consuming the fuel. However, it is likely that the reduction in exhaust emissions from the use of B20 will occur in air sheds where air quality is a significant problem as opposed to emissions associated with the fuel cycle that occur in rural areas where air quality is less of a problem.
They believe that biodiesel presents a promising alternative, although there are environmental trade-offs.
By developing an updated and modified life cycle inventory to estimate fuel cycle energy consumption and emissions, they found key improvements including an update of combustion emission factors based on 2006 US national average emission rates. It found that life cycle fossil energy reductions are estimated at nine per cent for B20 and 42 per cent for B100 against petroleum diesel based on the current national energy mix.
There were significant reductions in exhaust emissions by using B20. Local urban exhaust emissions are estimated to be 24 per cent lower for HC; 20 per cent lower for CO; 17 per cent lower for PM and 0.9 per cent lower for NOx.
When summarising the study, researchers commented that the air quality benefits of using biodiesel are dependent on geographic locations of the fuel production and on the vehicles consuming the fuel. However, it is likely that the reduction in exhaust emissions from the use of B20 will occur in air sheds where air quality is a significant problem as opposed to emissions associated with the fuel cycle that occur in rural areas where air quality is less of a problem.
They believe that biodiesel presents a promising alternative, although there are environmental trade-offs.
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