Microbial Conversion of Waste Glycerol from Biodiesel Production into Value-Added Products

Abstract

Biodiesel has gained a significant amount of attention over the past decade as an environmentally friendly fuel that is capable of being utilized by a conventional diesel engine. However, the biodiesel production process generates glycerol-containing waste streams which have become a disposal issue for biodiesel plants and generated a surplus of glycerol. A value-added opportunity is needed in order to compensate for disposal-associated costs. Microbial conversions from glycerol to valuable chemicals performed by various bacteria, yeast, fungi, and microalgae are discussed in this review paper, as well as the possibility of extending these conversions to microbial electrochemical technologies.

Keywords

• biodiesel waste glycerol
• microbial conversion
• 1,3-propanediol
• ethanol
• lactic acid
• hydrogen
• citric acid
• microbial electrochemical technologies