288 Refining Used Lubricating Oils
recycled product substitutes or replaces the original product. The standard dened by
ISO 14040 is
LCA considers the entire life cycle of a product, from raw material extraction and
acquisition, through energy and material production and manufacturing, to use and
end of life treatment and nal disposal. Through such a systematic overview and per-
spective, the shifting of a potential environmental burden between life cycle stages or
individual processes can be identied and possibly avoided. (ISO 14040:2006)
For instance, if used oil is recycled as feedstock to a renery, it may have to
undergo additional steps to remove some contaminants, but the energy and feedstock
costs and resources consumed in bringing ...