Decanter Centrifuges for Clarification of Fish Oil and Water Emulsions


Decanter Centrifuges for Clarification of Fish Oil and Water Emulsions


Fish oil is a highly valuable resource known for its rich omega-3 fatty acid content. It is extracted from various fish species and widely used in the food industry as a nutritional supplement. However, the process of obtaining fish oil involves the separation of water emulsions, which can be a challenging task. To overcome this issue, decanter centrifuges have emerged as a powerful technique for the clarification of fish oil and water emulsions. In this article, we will explore the principles behind decanter centrifuges and their application in the fish oil industry.

Decanter Centrifuges: An Overview

Decanter centrifuges, also known as solid-bowl centrifuges or scroll centrifuges, are a type of separation equipment widely used in various industries, including food processing, pharmaceuticals, and wastewater treatment. They operate on the principle of sedimentation, utilizing gravitational force to separate different components of a mixture based on their density differences.

These machines consist of a rotating cylindrical bowl with a screw conveyor inside. The mixture to be clarified is introduced into the bowl, and due to the high-speed rotation, the heavier solids settle at the bowl's wall, while the lighter liquids form an inner layer close to the screw conveyor. The screw conveyor then continuously transports the settled solids to the conical end of the bowl, where they are discharged. The clarified liquid is collected and led out of the decanter.

Application in the Fish Oil Industry

1. Clarification of Fish Oil Emulsions

Fish oil extracted from various fish species often contains water emulsions, which need to be removed to ensure the purity of the fish oil. Decanter centrifuges offer an effective solution to clarify these emulsions. By subjecting the mixture to high centrifugal forces, the heavier water droplets separate from the oil and settle at the bowl's wall, forming a distinct layer that can be easily discharged.

2. Separation of Impurities

In addition to water emulsions, fish oil may also contain impurities such as fish scales, bones, or small solid particles. Decanter centrifuges are capable of effectively separating these impurities from the oil. The solid particles settle at the bowl's wall, while the oil forms a separate layer, allowing for easy removal of impurities.

3. Continuous Processing

Decanter centrifuges offer the advantage of continuous processing, making them highly suitable for large-scale fish oil production. The continuous feed of the mixture into the centrifuge allows for a steady and uninterrupted separation process, maximizing productivity and efficiency.

4. Preservation of Nutritional Value

One significant advantage of using decanter centrifuges for fish oil clarification is their ability to preserve the oil's nutritional value. The gentle separation process and minimal exposure to heat ensure that the delicate omega-3 fatty acids and other essential nutrients present in the fish oil remain intact, leading to a higher quality end product.

5. Automation and Control

Modern decanter centrifuges are equipped with advanced automation and control systems, allowing for precise process monitoring and adjustments. Parameters such as rotational speed, feed rate, and discharge rates can be optimized to achieve the desired separation efficiency. This level of control ensures consistent product quality and reduces the need for manual intervention.


Decanter centrifuges have revolutionized the fish oil industry by providing an efficient and reliable method for clarifying fish oil and water emulsions. Their ability to separate impurities, preserve nutritional value, and offer continuous processing makes them indispensable in large-scale fish oil production. With the advancements in automation and control systems, decanter centrifuges continue to enhance the efficiency and quality of fish oil production, contributing to the growth of the food industry.


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