At least they are using it for Biodiesel. This happens daily in China, hundreds of thousands of people collect used oil from drains/sewers and sell it to a refi

At least they are using it for Biodiesel. This happens daily in China, hundreds of thousands of people collect used oil from drains/sewers and sell it to a refinery. However, the refinery doesn't turn it into bio-diesel; they clean it up and resell it as new cooking oil.