write a note on biofuels
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Biofuels are obtained by biomass like wood and straw, which are released by, direct combustion of dry matter and converts it into a gaseous and liquid fuel. Wet organic matters (like sewage, sludge and vegetable oils matter) may also be converted into biofuels by a wet process like digestion and fermentation. There are three solid biofuels: wood, straw and refuse, which are used to provide useful heat.
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Biodiesel is an alternative clean-burning renewable fuel similar to conventional diesel. It is produced using animal fats, vegetable oils, and waste cooking oil. Due to its biodegradable nature, it is used as a replacement for fossil diesel fuel. It can also be mixed with petroleum diesel fuel in any proportion.
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