Vegetable oil recycling
Vegetable oil recycling is increasingly being carried out to produce a vegetable oil fuel.
Opportunities for businesses and consumers to recycle used cooking oil ("yellow grease") has increased. Used cooking oil can be refined into different types of biofuels used for power generation and heating. A significant benefit is that biofuels derived from recycled cooking oil typically burn clean, have a low carbon content and don't produce carbon monoxide. This helps communities to reduce their carbon footprints. The recycling of cooking oil also provides a form of revenue for restaurants, which are sometimes compensated by cooking oil recyclers for their used deep fryer oil. Cooking oil recycling also results in less used oil being disposed of in drains, which can clog sewage lines due to the build-up of fats and has to be collected there as "brown grease" by grease traps.
Vegetable oil refining is a process to transform vegetable oil into fuel by hydrocracking or hydrogenation. Hydrocracking breaks larger molecules into smaller ones using hydrogen while hydrogenation adds hydrogen to molecules. These methods can be used for production of gasoline, diesel, and propane. The diesel fuel that is produced has various names including green diesel or renewable diesel.
In the past waste oils were collected by pig farmers as part of food waste from pig swill bins. The grease was skimmed off the swill tanks and sold for further processing, while the remaining swill was processed into pig food.
- Balkanlioğlu, Elif (April 15, 2012). "Recycling of waste cooking oil into biodiesel protects water resources". Today's Zaman (Turkey). Retrieved April 17, 2012.
- Meindersma, Sandy (April 8, 2012). "Recycling used cooking oil a snap for area restaurants". Worcester Telegram. Retrieved April 17, 2012.
- Hunt, April (March 28, 2012). "DeKalb commissioner sees recycling as answer to sewer spill woes". The Atlanta Journal-Constitution. Retrieved April 17, 2012.