Researchers Assess Life-Cycle Impact of Soy Biodiesel and Corn Ethanol
11 July 2006
An analysis by University of Minnesota researchers of the full life cycles of soybean biodiesel and corn grain ethanol concludes that biodiesel has much less of an impact on the environment and a much higher net energy benefit than corn ethanol, but that neither can do much to meet US energy demand.
The study, funded in part by the University of Minnesota’s Initiative for Renewable Energy and the Environment, was conducted by researchers in the university’s College of Biological Sciences and College of Food, Agricultural and Natural Resource Sciences. The study will be published in the 11 July Proceedings of the National Academy of Sciences.
The researchers tracked all the energy used for growing corn and soybeans and converting the crops into biofuels. They also looked at how much fertilizer and pesticide corn and soybeans required and how much greenhouse gases and nitrogen, phosphorus, and pesticide pollutants each released into the environment.
“Quantifying the benefits and costs of biofuels throughout their life cycles allows us not only to make sound choices today but also to identify better biofuels for the future.—Jason Hill, lead author of the study
The study showed that both corn grain ethanol and soybean biodiesel produce more energy than is needed to grow the crops and convert them into biofuels. This finding refutes other studies claiming that these biofuels require more energy to produce than they provide. The amount of energy each returns differs greatly, however. Soybean biodiesel returns 93% more energy than is used to produce it, while corn grain ethanol currently provides only 25% more energy.
Still, the researchers caution that neither biofuel can come close to meeting the growing demand for alternatives to petroleum. Dedicating all current US corn and soybean production to biofuels would meet only 12% of gasoline demand and 6% of diesel demand. Meanwhile, global population growth and increasingly affluent societies will increase demand for corn and soybeans for food.
The authors showed that the environmental impacts of the two biofuels also differ. Soybean biodiesel produces 41% less greenhouse gas emissions than diesel fuel whereas corn grain ethanol produces 12% less greenhouse gas emissions than gasoline.
Soybeans have another environmental advantage over corn because they require much less nitrogen fertilizer and pesticides, which get into groundwater, streams, rivers and oceans. These agricultural chemicals pollute drinking water, and nitrogen decreases biodiversity in global ecosystems. Nitrogen fertilizer, mainly from corn, causes the dead zone in the Gulf of Mexico.
We did this study to learn from ethanol and biodiesel. Producing biofuel for transportation is a fledgling industry. Corn ethanol and soybean biodiesel are successful first generation biofuels. The next step is a biofuel crop that requires low chemical and energy inputs and can give us much greater energy and environmental returns. Prairie grasses have great potential.—David Tilman, Regents Professor of Ecology and a co-author of the study
Biofuels from feedstocks such as switchgrass, mixed prairie grasses and woody plants produced on marginally productive agricultural land or biofuels produced from agricultural or forestry waste have the potential to provide much larger biofuel supplies with greater environmental benefits than corn ethanol and soybean biodiesel.
According to Douglas Tiffany, research fellow, department of applied economics and another co-author of the study, ethanol and biodiesel plants are early biorefineries that in the future will be capable of using different kinds of biomass and conversion technologies to produce a variety of biofuels and other products, depending upon market demands.
There is plenty of demand for ethanol as an additive. he ethanol industry was built on using ethanol as an additive rather than a fuel. Using it as a biofuel such as E85 is a recent and currently unsustainable development. As is, there is barely enough corn grown to meet demand for ethanol as a 10 percent additive.—Jason Hill
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