ABSTRACT
Many resources can be used as raw material for biodiesel production. These resources mainly originated from plants, particularly, and animals, in general. Depending upon the availability and production, the raw material for biodiesel can be classiŽed into three main headings: oil-yielding plants, animal fats, and recycled cooking oil. The raw material used for biodiesel production can be
• Vegetable oils • Waste vegetable oil (WVO) • Algae • Cow dung • Beef tallow • Pork lard • Trap grease • Microorganisms (geobacters) • Wild trees • Wastewater by bacteria • UFOs (used frying oils)
Alternative diesel fuels are made from natural, renewable sources such as vegetable oil and animal fats (Ratledge 1985; Lee, Johnson, and Hammond 1995). More than 350 oil-bearing crops have been identiŽed, among which only soybean, palm, sun˜ower, saf˜ower, cottonseed, rapeseed, pongame, castor bean, and peanut oils are considered as potential alternative fuels for diesel engines (Goering et al. 1982).
