Three Phase Decanter Centrifuge for Fish Oil

Three Phase Decanter Centrifuge for Fish Oil is designed for continuous separation of fish oil, water phase, and protein-rich solids in fish oil recovery and fishmeal processing lines.

In fish processing, the feed stream may contain fish oil, stickwater, fine protein solids, suspended particles, bone residue, fish sludge, and process water. A three-phase decanter centrifuge separates these mixed phases continuously and helps improve fish oil recovery, reduce oil loss, remove solid impurities, and lower the load on downstream polishing or refining equipment.

This centrifuge is suitable for fish oil recovery and fish processing lines where oil, water, and solids need to be separated continuously.

Typical applications include:

• Fish oil recovery from cooked fish slurry
• Fishmeal and fish oil processing lines
• Press liquor separation after fish pressing
• Fish stickwater oil recovery
• Separation of fish oil, water, and protein solids
• Recovery of oil from fish processing by-products
• Reduction of oil loss in protein sludge or water phase
• Primary separation before disc separator polishing
• Fish waste valorization and by-product recovery
• Marine oil processing from fish, fish offal, or fish residues

A three phase decanter centrifuge separates the feed into three main phases:

The fish oil process stream enters the rotating bowl through the feed pipe.

Under centrifugal force, the different phases separate according to density difference:

• Heavier protein solids, bone particles, suspended solids, and sludge move outward and form a sediment layer on the bowl wall.
• The water phase forms the heavier liquid layer.
• Fish oil stays closer to the center as the lighter liquid phase.

The screw conveyor rotates at a controlled differential speed and continuously pushes the separated solids toward the discharge end.

At the same time, the fish oil phase and water phase are discharged separately through different liquid outlets.

The centrifuge helps recover fish oil from mixed process streams and reduce oil loss in water phase or protein sludge.

The machine separates oil, water, and solids continuously, making it suitable for fishmeal and fish oil production lines.

By removing most solids and part of the water before oil polishing, the decanter reduces the burden on downstream disc separators.

The screw conveyor continuously removes protein-rich solids, suspended particles, and fish residue to maintain stable operation.

Continuous feeding, separation, oil discharge, water discharge, and solids discharge help improve production rhythm.

The machine can be connected with cookers, presses, buffer tanks, disc separators, evaporators, storage tanks, and control systems.

It supports fish waste valorization by recovering usable oil from fish processing by-products and process streams.

Under suitable feed and operating conditions, a three phase decanter centrifuge can typically help achieve:

• 70–95% recoverable fish oil recovery
• 30–60% reduction in oil loss in solids or water phase
• 60–85% reduction of suspended solids before downstream oil polishing
• 70–90% water phase separation efficiency
• 30–60% reduction in solid residue volume
• More stable fish oil quality before polishing
• 8–24 hours per day continuous operation suitability

These values are for engineering reference only. Final performance depends on raw material type, feed source, oil content, water content, solids content, temperature, viscosity, emulsification level, and operating parameters.

If the target fish oil quality is strict, a disc separator is usually recommended after the decanter for final polishing and residual water removal.

To recommend a suitable three phase decanter centrifuge for fish oil processing, please provide:

• Fish oil process stage
• Feed material: cooked fish slurry, press liquor, stickwater, fish offal slurry, or process residue
• Capacity requirement, in m³/h, tons/day, or kg/h
• Oil content
• Water content
• Solids content
• Protein solids content, if available
• Feed temperature
• Viscosity
• Particle size or solid characteristics
• Whether the oil is free oil or emulsified oil
• Current process before centrifuge
• Whether a cooker, press, or buffer tank is used before separation
• Target fish oil recovery
• Target oil clarity after decanter
• Target water content in recovered oil
• Target oil content in water or solids phase
• Whether a downstream disc separator is used
• Cleaning and CIP requirements
• Food-contact or hygiene requirements
• Required operating hours per day
• Site voltage and control preference
• Need for skid-mounted system or not

It is used to separate fish oil, water phase, and protein-rich solids from fish processing streams such as cooked fish slurry, press liquor, stickwater, or fish by-product slurry.

No. The decanter is mainly used for primary separation of oil, water, and solids. For final fish oil polishing and residual water removal, a disc separator is usually used after the decanter.

Yes. When the feed contains recoverable oil and suitable separation conditions are available, the centrifuge can help reduce oil loss in water or solid residue.

Heating or temperature control may be needed when the oil phase is viscous or when separation is unstable at lower temperature. The required temperature depends on the process and raw material.

Fish oil recovery depends on oil content, water content, solids content, protein behavior, temperature, viscosity, emulsification level, feed stability, and centrifuge settings.

If you have local customer channels or project resources involving fishmeal plants, fish oil recovery, marine oil processing, seafood by-product recovery, animal fat separation, or three-phase separation projects, Peony welcomes cooperation.

Peony can support local agents, distributors, and project partners with technical model selection, fish oil process separation proposal, skid-mounted system integration, equipment manufacturing, installation guidance, commissioning support, spare parts, and after-sales service.

Please send us your target market, customer type, project background, and cooperation proposal. Our team will evaluate the opportunity and provide technical and commercial support for suitable fish oil separation projects.