The crude glycerol formed during biodiesel production contains many impurities such asmethanol, soap, and various elements. Biodiesel producers use excess methanol to ensurecompletion of the transesterification reaction. Up to 80% of this excess methanol can end up inthe crude glycerol (Thompson and He, 2006). The rest of this excess methanol ends up in thebiodiesel produced (Chiu et al., 2005). The crude glycerol also contains soap formed from sidereactions and trace elements such as calcium, potassium, magnesium, sodium, phosphorous, andsulfur (Thompson and He, 2006).
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