The production of biodiesel from edible oils competes with the
use of land for food production. Moreover, the price of edible
plant and vegetable oils is usually higher than petro diesel.
Thus, finding a cheaper feedstock such as waste cooking oil
for biodiesel production reduces the cost of biodieselproduction
since the feedstock costs constitutes approximately 70–
95% of the overall cost of biodiesel production. Hence, the
use of waste cooking oils and non-edible oils should be given
higher priority over the edible oils as biodiesel feedstock
(Chhetri et al., 2008; Canakci, 2007). The purity level of the
biodiesel has strong influence on its fuel properties. Especially,
the amount of glycerides and triglycerides present in the fuel
can cause serious problems in application. Another factor that
must be taken into account is that the fuel must be almost free
of water, alcohol, glycerin and catalyst; thus, the ester layer
has to be treated. Therefore, the refining step of the products
obtained by transesterification is very important (Karaosmanoglu
et al., 1996; Predojevic, 2008).
The production of biodiesel from edible oils competes with theuse of land for food production. Moreover, the price of edibleplant and vegetable oils is usually higher than petro diesel.Thus, finding a cheaper feedstock such as waste cooking oilfor biodiesel production reduces the cost of biodieselproductionsince the feedstock costs constitutes approximately 70–95% of the overall cost of biodiesel production. Hence, theuse of waste cooking oils and non-edible oils should be givenhigher priority over the edible oils as biodiesel feedstock(Chhetri et al., 2008; Canakci, 2007). The purity level of thebiodiesel has strong influence on its fuel properties. Especially,the amount of glycerides and triglycerides present in the fuelcan cause serious problems in application. Another factor thatmust be taken into account is that the fuel must be almost freeof water, alcohol, glycerin and catalyst; thus, the ester layerhas to be treated. Therefore, the refining step of the productsobtained by transesterification is very important (Karaosmanogluet al., 1996; Predojevic, 2008).
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