在日本，地沟油被收集起来，经提炼变成生物柴油。一些垃圾车使用的正是这种环保燃料

　　To recover used oil most efficiently, the focus of the bus-collection service is to promote citizen involvement.

　　公车收集废油这个点子主要是为了鼓励全民参与的热情，以达到更好地回收地沟油的目的。

　　For residents, the system works like this: first, they peel off the labels from the empty clear plastic cooking oil bottle and rinse it; next, they fill it with their used cooking oil. Finally, they pass the full bottle to the bus driver when they get on the bus, and in return they receive a Chokotto Bus "Eco-Tomo" (which means "eco-friendly") voucher to use as a fare ticket worth 100 yen (about U.S.$1.1) on their next bus trip.

　　市民首先要做的就是撕掉空塑料油瓶的标签并将它清洗干净；接着将废弃食用油倒入瓶中。最后他们只要在乘公交时将这些瓶子交给巴士司机，同时为奖励其为环保做出的贡献，市民也会得到价值100日元（约合1.1美元）的车票代金券，下次乘车时就可使用。

　　There are also Candles made from used cooking oil and recycled glass.

　　此外，废弃食用油及回收的废玻璃还可以用来制作蜡烛。