Edible vegetable oils are referred to as the 1st generation feedstock and non-edible or waste known as
the 2nd generation feedstock. Although 1st generation biodiesel produced from edible oil has gained the
attention, the edible oil based biodiesel faced the problem of ‘food versus fuel’ debate and these factors
have negatively affected on biodiesel production from edible oils [14]. It has been seen that the price of
biodiesel mainly depends on the cost of feedstocks which makes up 70-80% of the total biodiesel cost
[15]. The selection of 2nd generation feedstock is due to the high costs of edible biofuel feedstocks for
biodiesel production [15]. Therefore, the use of cost-effective 2nd generation feedstocks can be a way to
improve the economy of biodiesel production and its commercial production at an industrial scale.
However, due to the problems associated with food versus fuel, environmental and economic issues
related to 1st generation, the 2nd generation feedstocks [15] is gaining popularity for biodiesel production.