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US #Government Report Strengthens Consensus on #Biodiesel Benefits

January 22, 2018 By admin Leave a Comment

A new study on biodiesel’s lifecycle energy and greenhouse gas (GHG) emission effects updates and reaffirms the long-understood benefits of using the renewable fuel. The study is the latest in the significant body of transparent, peer-reviewed, studies that conclusively quantify biodiesel’s widespread benefits. The report, recently published by a collaboration between Argonne National Laboratory, Purdue University, and the U.S. Department of Agriculture (USDA), represents the most up-to-date and comprehensive lifecycle analysis of biodiesel ever produced. Results confirm that biodiesel compared to petroleum diesel reduces GHG emissions by 72 percent and fossil fuel use by 80 percent.

“This is the highest GHG reduction of any heavy-duty transportation fuel and reflects biodiesel’s natural ability to store solar energy in a liquid form compatible with today’s engines and power generation technologies,” said Jim Duffield, who coauthored numerous lifecycle reports for USDA’s Office of the Chief Economist prior to his recent retirement.

“It’s encouraging to see the commitment to data and quality analysis brought together in this study,” said Don Scott, sustainability director for the National Biodiesel Board. “It’s not news that biodiesel is good for the environment. Where credible results are needed for sound policies, it serves us well to look at transparent, reliable science.”

This study represents the first time Argonne National Laboratory has published a lifecycle assessment of biodiesel including indirect land use change (ILUC). The theory of ILUC suggests that economic benefits from renewable fuels impact farming patterns globally. ILUC modeling attempts to quantify the future impact of such predicted land use change. ILUC has been included in analyses by the U.S. Environmental Protection Agency (EPA) and the California Air Resources Board (CARB) that independently conclude biodiesel’s GHG advantage exceeds 50 percent reduction over diesel fuel.

“The improvements to ILUC modeling in this study were not possible just a few years ago, because we did not have as much data as we do today,” said Farzad Taheripour, one of the authors of this paper from Purdue University’s Department of Agricultural Economics. “Data available today shows that farmers all around the world are increasing productivity on existing farm land. Calibrating the model to these real-world trends improves the accuracy and reduces the predicted emissions of biofuel expansion.”

The more the models reflect real world data, biodiesel’s benefits become even clearer. The improved model reduces ILUC emissions by more than 30 percent relative to the score adopted by CARB in 2015.

“Biodiesel’s emission-reduction benefits are so great that you can overapply penalties aligned with the most conservative models and biodiesel is still the cleanest alternative for today’s diesel engines and the heavy-duty transportation of tomorrow,” said Scott.

For example, although CARB applies an ILUC penalty to soy biodiesel, biodiesel remains a key component to reducing greenhouse gas emissions under the Low Carbon Fuel Standard.

Using its flagship GREET® LCA model, Argonne computes the GHG advantage of biodiesel as reducing emissions by 76 compared to petroleum. GREET®—whose acronym stands for Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation—houses the best engineering data for allocating process emissions, but it does not make predictions of future economic changes. When predicted economic impacts are added, the GHG benefit lands in the range of 66 to 72 percent better than petroleum. The lower end of this range results from using CARB’s emission factor model developed specifically for the California market. The higher end of this range results from using the emission factor model developed by the national laboratory, which includes higher resolution for organic carbon where that data is available.

Roughly half of the biodiesel used in the US is made from soybean oil. The other half is produced from sources like used cooking oil, animal fats, and other fats and oils. The authors of this study began by collecting the latest data on the energy and emissions from farming soybeans. Soybeans are grown primarily to produce protein meal for livestock feed. So, the first processing step after soybeans leave the farm is to a soybean crush facility where 80 percent of every soybean is used to produce livestock feed. The volume of oil that remains after protein extraction exceeds demand for feed or food, (i.e. salad dressing, frying and baking, etc.), so a portion of that oil that we cannot eat or export is used to produce biodiesel.

“This study includes the largest ever survey of biodiesel production facilities to capture the energy used in the form of natural gas and electricity to convert fats, oils, and grease into biodiesel fuel,” said Jeongwoo Han, who maintains the GREET® model for Argonne National Lab.

All these emissions were also combined with the emissions of transporting raw ingredients and finished fuel to market. By including all the emissions in the entire fuel lifecycle, this report presents a comprehensive comparison with the emissions of producing and using diesel fuel. This study includes more data but yields consistent results with other studies published over the last two decades.

Scott, Taheripour, and Han will present this week at the National Biodiesel Conference and Expo in Ft. Worth, Texas. Each speaker promises to share more detail about their work in a context that highlights not only the GHG benefits of biodiesel, but also explains how biodiesel is part of a trend that is improving the quality and affordability of the food supply while conserving land to protect habitat and biodiversity.

SOURCE National Biodiesel Board
http://biodiesel.org

Filed Under: Tech Tagged With: biodiesel, biofuel

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