Industrial oil-water separator oil-water separation method
1. Remove floating oil
The main basis for using industrial oil-water separators to remove floating oil is to achieve this effect through gravity separation. Due to the difference in density between oil and water, coupled with their inherent incompatibility, these two points can be utilized to separate oil and water from each other using gravity separation.
The difficulty of separating oil droplets from water is determined by the particle size of the oil droplets. Oil droplets with smaller particle sizes are more difficult to separate, while those with larger particle sizes are easier to separate.
2. Solid liquid separation
There are many impurities and solid particles in liquids, which need to be removed and filtered out using a filter. This process is called solid-liquid separation.The solid particles usually removed have an accuracy greater than 5 μ m. High precision filters are used to separate these solid particles from the liquid, and this solid-liquid separation process lays the foundation for the next step of emulsion breaking and coalescence.
3. Emulsification and aggregation
The main steps of emulsion breaking and coalescence are emulsion breaking and coalescence. Firstly, a fine fiber filter layer needs to be used to cut open the emulsified water in oil, which is called emulsion breaking. During this process, the fine fiber filter layer needs to be both oleophilic and hydrophobic, otherwise it will not achieve good emulsion breaking effect.
After the oil droplets are demulsified, they will approach and adhere to the fibers, forming a situation where the oil droplets are adsorbed on the aggregation material. In addition, the filtration process itself is a diffusion process, and the filtration method is from inside to outside, from dense to sparse. Therefore, if the adsorption force is smaller than the gravitational force of the water flow, it will cause the coalesced oil droplets to detach from the material, releasing them and instead attaching and coalescing into larger oil droplets, which is a process of initial coalescence.
4. Coarse grained aggregation
This process mainly relies on a slender tube that is lipophilic. The liquid mixed with water and oil is passed through the tube by multiple long tubes that are lipophilic. The mixed liquid flows through the tube and collides, causing small oil droplets to aggregate and adhere to the wall of the lipophilic slender tube, forming large oil droplets.
Due to the different specific gravity of oil and water, water flows downwards while oil accumulates upwards. Therefore, after this coarsening and agglomeration process is completed, the oil layer, water layer, and oil-water mixture layer can be displayed in detail, and the separation effect will be more obvious and intuitive.
5. Fine emulsion breaking and aggregation
The next step in oil-water separation is the refinement of emulsion breaking and coalescence. The prerequisite for achieving this step is to ensure the thickness of the fiber layer, which is mainly dense inside and hydrophobic outside. Its characteristics are oleophilic but hydrophobic, in order to ensure the refinement of emulsion breaking and coalescence. During this process, it is necessary to reduce the flow rate of the mixture in order to refine the oil content to below 0.02%.
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