1. Introduction
Energy problem has become one of the most serious issues all over the world since energy consumption is inevitable for human existence. At this point, a large amount of alternative energy appears. Among them, microbial lipids can be used as a renewable alternative (biodiesel) to traditional fossil diesel fuel. Biodiesel, a mixture of fatty acid alkyl esters, can be obtained from various renewable lipid resources such as vegetable oils, fats and wastes of cooking oils (Liu et al., 2008). However, use of edible oils for bio-diesel production competes with food production and requires land and irrigation water; these requirements and the high lignin content of terrestrial plants reduce the economic viability of this production mode. Especially in the countries like South Korea which has no vast territory to cultivate a large amount of high oil content plants, it is meaningless to use the edible oils for biodie-sel production.
1. Introduction
Energy problem has become one of the most serious issues all over the world since energy consumption is inevitable for human existence. At this point, a large amount of alternative energy appears. Among them, microbial lipids can be used as a renewable alternative (biodiesel) to traditional fossil diesel fuel. Biodiesel, a mixture of fatty acid alkyl esters, can be obtained from various renewable lipid resources such as vegetable oils, fats and wastes of cooking oils (Liu et al., 2008). However, use of edible oils for bio-diesel production competes with food production and requires land and irrigation water; these requirements and the high lignin content of terrestrial plants reduce the economic viability of this production mode. Especially in the countries like South Korea which has no vast territory to cultivate a large amount of high oil content plants, it is meaningless to use the edible oils for biodie-sel production.
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