litters of cooking oil every year and most of that used oil and up in the sewer system where it's close to cause a serious blockage of how disgusting right mt oh most definitely sharon or believe it or not these so called birds can be used as a resource now a british company is turning them into green bio diesel let's have a look at how they're doing it. if you're going to venture down into london soon as you don't want to be too squeamish sewage for millions of homes flows through these tunnels restaurants and snack bars also flush millions of liters of cooking oil down the city's drains every year this discarded fat has led to a festering problem in the sewage system liquid grease congeals into a tough slimy mass these so-called fat burks can cause serious blockages british company arjun energy is transforming this waste fat into bio diesel dickon pozen it