88 Refining Used Lubricating Oils
It may contain small quantities of toxic substances that are liable to degrade the qual-
ity of air, soil, and ground water if it is not handled and disposed of in an appropriate
manner.
In developing countries, most of the used oil that is generated originates from
lubricating oil in the transport sector; the quantities of hydraulic oil and transformer
oil are relatively small. Agriculture (irrigation pumps, etc.) and the energy sector
(small-scale power stations with diesel engines) are the second most signicant
source. Most used oil arises in urban centers and along major roads at lling stations
and motor vehicle repair shops, and in some cases also at DIY oil-change stations on
sites adjacent to major ro ...