Newsletter and Technical Publications
<Municipal Solid Waste Management>
1.7.5 Used oils
Used oils are generated mostly in gas stations and in
mechanics' shops. These oils frequently enter the sewage system, causing
problems in treatment plants or in the receiving water bodies. When oil is
collected haphazardly as part of the MSW stream, it causes problems at the
landfill and often becomes part of the landfill leachate.
|Sound practices for handling used oils
- Re-refining into lubricating oil. The hazard associated with
this practice is that the residues from the process are deposited in
the MSW stream or in drains. Education must be geared to explaining
the problems caused by this casual disposal. Ideally, residues should
be burnt in a cement kiln. When this is not possible, residues should
be placed in a landfill in a sealed container.
- Use as a fuel. In this case, there is a risk that heavy
metals contained in the oil will be emitted into the environment.
Thus, used oil is best used as a fuel in cement kilns where heavy
metals are absorbed into the cement matrix.