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- Disadvantages of using biodiesel produced from agricultural crops involve **additional land use**, as land area is taken up and various agricultural inputs with their environmental effects are inevitable. - Even modest usages of biodiesel would consume almost all cropland in some countries in Europe! If the same thing is to happen all over the world, the impact on global food supply could be a major concern, and could make some countries being net importers of food products, from their current status of net exporters -It gives out **more nitrogen oxide emissions** (Nitrogen oxide emissions from biodiesel blends could possibly be reduced by blending with kerosene or Fischer-Tropsch diesel - biodiesel require special management. Some properties of biodiesel make it undesirable for use at high concentrations -For example, pure biodiesel doesn't flow well at low temperatures, which can cause problems for customers with outdoor storage tanks in colder climates - A related disadvantage is that biodiesel, because of its nature, can’t be transported in pipelines. It has to be transported by truck or rail, which increases the cost. -Biodiesel is **less suitable for use in low temperatures**, than petrodiesel. The “cloud point” is the temperature at which a sample of the fuel starts to appear cloudy, indicating that wax crystals have begun to form. At even lower temperatures, the fuel becomes a gel that cannot be pumped. - The “pour point” is the temperature below which the fuel will not flow. As the cloud and pour points for biodiesel are higher than those for petroleum diesel, the performance of biodiesel in cold conditions is markedly worse than that of petroleum diesel. -Vehicles running on biodiesel blends may therefore exhibit more drivability problems at less severe winter temperatures than do vehicles running on petroleum diesel. -biodiesel is that it tends to **reduce fuel economy**. Energy efficiency is the percentage of the fuel’s thermal energy that is delivered as engine output, and biodiesel has shown no significant effect on the energy efficiency of any test engine.-

-The energy content per gallon of biodiesel is approximately 11 percent lower than that of petroleum diesel. Vehicles running on biodiesel are therefore expected to achieve about 10% fewer miles per gallon of fuel than petrodiesel -Biodiesel is a good solvent, and can dissolve rubber and certain plastics, remove paint, as well as oxidize some metals. Biodiesel has also been reported to destroy asphalt and concrete if these are exposed long enough to biodiesel! The solvent property of biodiesel could also cause other fuel-system problems. Biodiesel may be **incompatible with the seals used in the fuel systems** of older vehicles and machinery, necessitating the replacement of those parts if biodiesel blends are used - biodiesel can loosen deposits, then they can migrate and clog fuel lines and filters. - There have been a few concerns regarding biodiesel’s **impact on engine durability** **-** At low temperatures, diesel fuel forms wax crystals, which can clog fuel lines and filters in a vehicle’s fuel system.

n/a. (after 2006). //Problems with and disadvantages of biodiesel//. Retrieved from []

n/a. (after 2006)