I have seen one group of students did a research to preapre soap by using used cooking oil few years back. The ideas popped in these groups of students as they noticed most of the used cooking oil were not handled properly and passed into drains. This could lead to environmental problems.
Now, 2 councils in Selangor are about to start to collect used cooking oil from restaurants. The used cooking oil can be reprocessed to become bio-fuel and bitumen. Good approach!! For more details, read Councils to recycle used cooking oil from The Star.