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Unintended energy impact from bioethanol production
Source : environmental-expert.com
Increasing crop production to meet demand for biofuels potentially increases the use of nitrogen fertilisers, which can lead to nitrate pollution in surface and groundwater. A new study is the first to consider the unintended extra energy needed to treat water to remove nitrate contamination in drinking water supplies. In the United States, the Renewable Fuel Standard (RFS) stipulates the volume of renewable fuel required to be blended into petrol must be increased from 9 billion gallons in 2008 to 36 billion gallons in 2022; 15 billion gallons of this can come from traditional first generation biofuels, such as bioethanol, produced from maize. In the EU, the Directive on the promotion of the use of biofuels for transport mandates the share of biofuels be increased from 2% of total fuel supply in 2005 to 5.75% of total supply in 2010, based on the energy content.
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11 mars 2010 |
Environnement ::
Agriculture ::
Etats-Unis & Canada
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