The importance of maintaining the highest standard of production is vital in today's market where Biodiesel is being widely adopted by major industries.
This quality control must be maintained at every processing step, from the monitoring of the quality and acidity of feedstock, to ensuring complete separation of biodiesel and glycerine, to the removal of excess alcohol and contaminants from biodiesel before it is sold as fuel.
International Biodiesel Quality Standards
The following link will open a document that shows the current parameters that must be met to achieve United States ASTM D6751 and European EN14214 quality standards for biodiesel:
American and European Biodiesel Quality Standards