Applications of High-Efficiency Coalescing Oil Separators

Treating oily wastewater from industrial production is a major challenge in environmental protection. Oil pollutes the environment and threatens health. Such wastewater is characterised by uneven oil-water mixing, small droplet size, a high degree of emulsification and possible chemical additives. Conventional treatment methods suffer from low removal efficiency, high cost, complex operation and a large footprint, driving the search for more efficient and economical technology.

1. Characteristics and treatment difficulties of oily wastewater
Oily wastewater comes mainly from oil extraction, processing and transport as well as machinery manufacturing and metal working. It contains large amounts of suspended oil droplets, emulsified oil and dissolved oil, is complex in composition and difficult to treat. Emulsions are highly stable and do not separate naturally, and conventional physical methods such as gravity settling and air flotation are inefficient, making strict environmental standards hard to meet.

The main difficulties include:

1. low oil-water separation efficiency that struggles to meet discharge standards;

2. emulsified oil that is hard to break and fine droplets that are hard to remove;

3. high energy consumption and operating cost with conventional methods;

4. frequent manual maintenance and complex operation.

2. Oil removal principle and advantages of the high-efficiency coalescing separator
The high-efficiency coalescing oil separator uses advanced coalescing technology, capturing and coalescing fine oil droplets efficiently through special filter media and design. The principle is that the oleophilic filter media adsorb fine droplets from the water and coalesce them into larger droplets, accelerating oil-water separation.

Internal components of the high-efficiency coalescing oil separator

The equipment effectively overcomes the drawbacks of conventional methods:

• CFD-optimised internal flow field: computational fluid dynamics simulation optimises the design to ensure efficient wastewater flow and improve separation efficiency.

• Special coalescing internals: they effectively enlarge droplet size, accelerate separation and raise oil removal efficiency.

• Fully automatic control: less manual intervention, lower operational complexity and maintenance cost.

• Enclosed pressure oil removal: it takes place in a closed system, avoiding secondary pollution and ensuring environmental compliance.

Its advantages are:

1. High oil removal efficiency: it effectively removes droplets smaller than 10 microns with a treatment efficiency above 99%.

2. Stable performance: it suits oily wastewater of different concentrations and types with stable, reliable results.

3. Energy saving and clean: the low-energy design keeps operating costs down and meets environmental requirements.

4. Simple operation: a high degree of automation and easy maintenance reduce labour costs.

5. Small footprint: the compact structure takes only 1/3 of the space of conventional processes and suits any site.

3. Application prospects for the high-efficiency coalescing separator
As environmental regulations tighten and companies focus on sustainable development, the high-efficiency coalescing oil separator has broad prospects. It is suitable not only for petroleum, chemical and machinery manufacturing but also for wastewater treatment in shipping, automotive manufacturing, food processing and other industries.

Specific applications include:

1. Petrochemical industry: oily wastewater treatment in refineries and chemical plants, helping meet discharge standards.

2. Machinery manufacturing: treatment of oily machining wastewater, improving water recycling rates.

3. Shipping: treatment of oily bilge water to meet International Maritime Organization requirements.

4. Municipal wastewater treatment: use as pre-treatment equipment to improve overall treatment efficiency.

Application cases:

• A petrochemical plant in Hebei: treatment of oily electric desalter drained water with an inlet oil content above 5000 mg/L. Using two stages of CDFU plus a high-efficiency coalescing oil separator, the outlet oil content was below 50 mg/L and suspended solids below 100 mg/L.

• A petrochemical plant in Sichuan: treatment of oily wastewater with an inlet oil content above 10,000 mg/L. After a single-stage coalescing separator plus a single-stage CDFU process, the outlet oil content was below 100 mg/L, with oil removal above 98% and a retention time of only 15-20 min.

The high-efficiency coalescing oil separator has been proven in long-term industrial service to treat oily wastewater efficiently and rapidly, outperforming other equipment, with broad prospects. As technology advances and is optimised, the equipment is expected to reduce costs further and raise efficiency, giving more companies an economical and effective solution.