Waste oil purification and regeneration work is also of great significance to the protection of the environment. At present, China's various industries use 10 million tons of lubricating oil every year, only a small part of which has been collected, purified, regenerated and put into use again, and the rest are mostly burned. Discard. Such treatment method has caused great pollution to the environment, seriously affected the ecological environment and threatened people's normal life.

According to research, waste mineral oil can penetrate into the soil. Oil diffuses into the soil by the force of gravity and surface activity. The diffusivity depends on the type and structure of the subsoil, water temperature conditions, density, viscosity, wettability and additive content of the oil. After oil infiltrates into soil, it forms an "oil block" which eventually meets the surface of groundwater and dissolves in groundwater, causing pollution to groundwater resources. Oxygen and microorganisms can degrade oil to some extent. But the oil infiltrated underground takes a long time to be degraded or oxidized gradually. Therefore, starting from the point of protecting the environment, we should strictly prohibit the waste oil and liquid from being thrown randomly and sprinkled indiscriminately.