High-Efficiency Coalescing Oil Separator (CPI) — Making Industrial Wastewater Oil Removal Simpler, More Efficient, and More Eco-friendly

Detailed Explanation of Working Principles

1. Gravity Settling and Laminar Flow Design: One of the core principles of the CPI (Corrugated Plate Interceptor) is gravity settling based on Stokes' Law. Through carefully designed flow velocity controls within the equipment, the oil-bearing wastewater is maintained in a laminar flow state. In this state, the upward buoyant force (Archimedes buoyancy) acting on the oil droplets is allowed to function stably, thereby achieving oil-water Gravity Settling and Laminar Flow Design: One of the core principles of the CPI (Corrugated Plate Interceptor) is gravity settling based on Stokes' Law. Through carefully designed flow velocity controls within the equipment, the oil-bearing wastewater is maintained in a laminar flow state. separation and preventing turbulence from interfering with the droplet coalescence and flotation processes.
2. Enhanced Coalescence Effect: In addition to gravity settling, the CPI achieves a coalescence effect through its specialized corrugated plates. The surfaces of these corrugated plates are treated with an oleophilic (oil-attracting) and hydrophobic (water-repelling) coating. As small oil droplets flow with the water stream across this rough, oleophilic surface, they are more easily captured, adhere to the surface, and coalesce with one another to form larger oil droplets. As the size of the oil droplets increases, their upward flotation velocity increases quadratically, resulting in a significant improvement in separation efficiency.

3. High-Efficiency Corrugated Plate Assembly:

(1) Optimized High Inclination Angle: The corrugated plates are typically positioned at an inclination angle Gravity Settling and Laminar Flow Design: One of the core principles of the CPI (Corrugated Plate Interceptor) is gravity settling based on Stokes' Law. Through carefully designed flow velocity controls within the equipment, the oil-bearing wastewater is maintained in a laminar flow state. ranging from 40° to 60°. This specific angle ensures that the oil droplets have sufficient channels for upward flotation while simultaneously optimizing the distribution of the water flow and facilitating the downward sliding of settled solids.

(2) Cross-Corrugated Structure: The surface is not merely a simple flat plate or a single-direction corrugated sheet; instead, it employs a cross-corrugated design. This structure vastly increases the effective surface area per unit volume, providing oil droplets with more opportunities for collision and coalescence, while also enabling high surface loading capacity.

4. Synergy of Multi-Layer Media:

(1) "Flow-Through Coalescence Media": Serving as the core medium, this component allows liquid to pass directly through it while facilitating the preliminary coalescence of oil droplets across its immense internal surface area. This medium can be utilized not only in new equipment installations but is also frequently employed to retrofit existing storage tanks, thereby enhancing their separation performance and processing throughput.

(2) "Polymeric Secondary Coalescence Media": This refers to a type of coalescing packing material characterized by a high-density surface area, which can be incorporated as an additional component. It is capable of effectively capturing oil droplets of even smaller particle sizes; it can be utilized independently in conjunction with existing systems, or installed in series with "flow-through" media to form a multi-stage capture network, thereby achieving the most refined separation results.

5. High-Efficiency Removal Capability: For typical wastewater streams—such as those found in the petrochemical industry—the CPI system efficiently removes free oil, reducing the oil concentration in the treated effluent to as low as 10 ppm or even lower. This significantly reduces the downstream load on subsequent biochemical or advanced treatment processes.

6. Compactness and Cost-Effectiveness: Thanks to its highly efficient separation unit design, the CPI system features a more compact structure and requires a smaller footprint compared to traditional separators (such as large-scale API oil-water separators). Furthermore, as it contains virtually no moving parts, maintenance requirements are drastically reduced, leading to a significant reduction in total lifecycle operating and maintenance costs.

7. High Customizability and Flexibility:

(1) Wide Range of Processing Capacities: Customizable specifications are available to handle flow rates ranging from 5 to 500 cubic meters per hour, accommodating industrial projects of varying scales.

(2) Multiple Configuration Options: Depending on site-specific requirements regarding oil layer thickness and processing volume, clients may opt for either fixed or rotating skimmers to enable the automated collection of free oil.

(3) Proven Retrofit Solutions: In addition to comprehensive "Design-Build" packages for new installations, the manufacturer offers proven tank retrofit services, allowing existing storage tanks to be upgraded into high-performance CPI systems, thereby enhancing the return on investment.