RESULTS AND DISCUSSION
Effect of Oil Types: The position of the interface between sediment (glycerol) and supernatant liquid (biodiesel) for different types of oil is shown in Figure 1 as a function of time.
The glycerol produced from fresh oils (palm, rice bran and soya oils) settled faster than the one produced from the mixture of used vegetable oil (UVO) and used animal fat (UAF).
The highest settling rate for glycerol was recorded when the soybean oil was used.