Yellow grease

[1] Due to competition from these other industrial sectors, the EIA estimates that less than a third of yellow grease could be spared for biodiesel production annually.

[5] The industry which collects and renders yellow grease to make refined used cooking oil is dominated by a number of very large companies.

[6] No reliable statistics exist on the number of smaller to mid-size companies who collect yellow grease and either sell or render it to produce refined used cooking oil.

[7] This formerly Mom and Pop industry, the collection of used cooking oil, has grown to the point where fleets of trucks, regional and nationwide coverage and large processing plants are commonplace and consulting groups and software companies play an increasingly prominent role.

During the rendering process fatty acid is separated from the moisture, the solids and any impurities that are present in the waste cooking oil.