the wound on the territory of the company of used oils carries not only a potential risk from the fire hazard, but also from the environmental safety of the enterprise.
All this requires additional costs. The period of storage of used oils may be uncertain. This is due to the fact that the enterprises themselves can not restore the original properties of used oils for their subsequent return to the technological process due to the lack of appropriate technologies and their implementation. These wastes can not be utilized by burning through the emission of a significant amount of harmful substances (heavy metal compounds).
Transfer of used oil to refineries, where their combined processing in a mixture with crude oil can be carried out in full technological scheme, is complicated by the presence of contaminants and additives that negatively affect the operation of electro-desalting devices, worsen the process of oil separation, increase the content of oil products in wastewater
In case of transformer maintenance, it is necessary to purchase a fresh oil product and fill it in place of the used oil. In addition, there is a need somewhere to put waste oil. In practice, physicochemical, thermal or biological methods can be used for its utilization. In turn, the physicochemical approach is realized due to the application of filtration, sorption, coagulation, separation, extraction both separately and in various combinations.
At the end of the life cycle, the oil needs to be collected, after which it can be recycled or reused using a certain treatment. According to existing estimates, around 1.5 billion liters are recycled annually to the world. waste oil. The recycled product can be used for the same purposes as the original product, but in some cases the application sector is radically different. An example is engine oil: after regeneration, it can be sold in car stores, and can be used as recycled fuel oil. Liquids intended for aluminum rolling are restored directly in the field and reused immediately.
Waste oil can be recycled in the following ways:
1) on-site restoration. In this case, contaminants are removed from the oil product, and it can be reused. This approach does not allow to restore the properties of the oil completely, but its shelf life extends.
2) sending to an oil refinery. There the waste oil can act either as a raw material, or as coke oven in the production of gasoline and coke.
3) regeneration. This process is understood as oil treatment, removal of contaminants from it for reuse. Theoretically, regeneration can extend the life of the oil resource to infinity. This solution can be considered the most preferable, since regeneration completes the recycling cycle by reusing oil to produce the same product. This saves energy resources and natural oil.
4) processing and incineration to produce heat. In this case, water and impurities are removed from the oil to such an extent that it can be burned as fuel. This method is less preferred, since the test is only used once.
The expediency of utilization is confirmed by the following facts:
1) regeneration is less energy-intensive. The use of regeneration technologies requires the presence of only a third of the energy from that used in the processing of gray oil into a lubricating oil.
2) to obtain 1 liter of fresh oil, it is necessary to use 67.2 liters of crude oil. While used oil for the same purposes, you need to spend 1.6 liters.