Treatment of waste oil
In the city of Kalundborg, Denmark, Dansk Olie Genbrug A/S has invested in a waste-oil processing plant (the Vaxon system) with a capacity of 35,000 tonnes per year. When the waste-oil is pumped through the system, an ongoing refining process removes impurities. The finished product is a high-quality petroleum which may be used in all furnaces without problems.
The plant is expanding further to permit the production of base oils (i.e. the base component of lubrication oils), which represents a real improvement for the environment. That is because the actual recycling of lubrication oils, rather than simply processing waste oil into fuel, is more in keeping with sound environmental principles. The underlying environmental-political principles can be studied in the 1997 discussion paper on industrial waste issued by the National Agency of Environmental Protection.
Apart from the Kalundborg processing plant, Dansk Olie Genbrug A/S operates a plant in the city of Horsens (earlier Østjydsk Oliedepot), a tank plant in Struer, and a tank plant in Kalundborg with direct loading facilities for ships.

Sale of the treated waste oil
Based on tradition and government legislation, most of today’s waste oil is treated for the purpose of being sold to district heating plants.Treated waste oil is sold to approximately 30 district heating plants. Total oil sales for this purpose amounted to 19,000 tonnes (metric tons) in 1997.