Overview of oily sludge
Oily sludge (hereinafter referred to as “sludge”) is a substance composed of water, mud, oil and other impurities. Due to the diversity of sources of sludge, its composition is complicated and it is difficult to control. Its main sources include ground oil spill, ground oil sludge, tank bottom sediment and oil sludge produced in the process of refining. These sludge not only pollute the environment, but also affect the normal progress of production and life. Therefore, effective treatment of oily sludge is particularly important.
- Oily sludge treatment method
At present, the main methods for the treatment of oily sludge include physical method, chemical method, biological method and hot washing method. Among them, the hot wash method stands out among many methods because of its efficient and clean characteristics.
- Physical method: the sludge is separated and treated by physical means such as gravity sedimentation and centrifugal separation. This method is suitable for the separation of impurities and oils with large particles, but it cannot completely remove small particles and organic matter.
- Chemical method: Use chemical reaction to change the physical properties of sludge, such as adding chemical agents to separate oil and water. However, chemical methods often have shortcomings such as residue of chemicals and secondary pollution to the environment.
- Biological method: The use of microorganisms to degrade organic matter in sludge, although this method is environmentally friendly, but the treatment cycle is long, and the environmental conditions are high.
- Hot wash method: It is one of the most effective oily sludge treatment methods at present. The hot washing method mainly separates the impurities and oils in the sludge by hot water and detergent under high temperature and pressure environment. The method can effectively remove small particles and organic matter, and the treated sludge is of high quality and can meet the standard of reuse.
Third, the steps of hot washing treatment of oily sludge
- Pretreatment: Preliminary classification and screening of oily sludge to remove large impurities.
- Hot washing process: the pre-treated oily sludge is placed in a high temperature and high pressure environment, and stirred by adding detergent. In this process, oils and impurities are broken down and separated under the action of detergents.
- Solid-liquid separation: The mixture after hot washing is separated by solid-liquid separation equipment to obtain solid waste and clean liquid.
- Waste treatment: Further processing and treatment of solid waste, so that it meets environmental protection emission standards or can be reused standards. The clean liquid can be reused or disposed of after further treatment.
Fourth, the advantages of hot washing method
- High efficiency: Hot washing method can quickly treat a large number of oily sludge in a short time.
- Cleanliness: Oily sludge treated by hot washing method has high cleanliness and good quality.
- Environmental protection: there is no secondary pollution in the hot wash treatment process, and the treated waste can meet the environmental discharge standards or reuse standards.
V. Conclusion
With the rapid development of industry and the improvement of human awareness of environmental protection, the treatment of oily sludge becomes more and more important. Hot washing method is the best choice to treat oily sludge because of its high efficiency and clean characteristics. However, in the specific implementation process, it is also necessary to pay attention to environmental protection, resource reuse and other issues, to ensure that no new pollution sources are generated in the process of treatment, and to achieve true green production and life.