Media de filtration biologique

A biofiltration support is an element used in biological filtration systems, primarily in aquaculture installations such as Recirculating Aquaculture Systems (RAS). It serves as a medium for microorganisms (bacteria, fungi, etc.) to decompose dissolved organic matter, such as ammonia and nitrites, into less toxic compounds like nitrates.

Description of a Biofiltration Support:

Biofiltration supports are often made from materials with a high specific surface area, allowing microorganisms to attach and grow effectively. These supports can come in various forms, such as balls, cylinders, plates, or matrices made of plastic or ceramic. Their primary function is to provide a surface for the colonization of microorganisms that play a key role in the nitrogen cycle.

Types of Biofiltration Supports:

1. Plastic Supports: These are commonly used in modern RAS systems due to their lightweight, durability, and ease of maintenance. These supports can be in the form of balls, plates, or cylinders.

2. Ceramic Supports: These are very effective due to their large surface area and are often used in smaller-scale aquaculture systems or for specific applications.

3. Foam or Polyester Supports: They offer good bacteria retention while being easy to handle, but may require more frequent maintenance to prevent excessive debris buildup.

Function and Benefits:

• Improved Water Quality: Biofiltration supports promote the breakdown of toxic nitrogen compounds in the water, thereby improving water quality for the fish.

• Reduction of Toxin Levels: By transforming ammonia and nitrites into nitrates, which are less harmful to fish, biofiltration supports contribute to a safer aquatic environment.

• Regulation of Water Parameters: Biofiltration supports play a crucial role in balancing water parameters by regulating nutrient concentrations and maintaining proper oxygenation.

Common Applications:

• Recirculating Aquaculture Systems (RAS): Used to maintain clean and healthy water in recirculating systems, where water is continuously reused.

• Marine and Freshwater Aquaculture: Used in ponds, tanks, or floating cages to support biological filtration and maintain optimal conditions for fish growth.

Biofiltration supports are essential for maintaining ecological balance in aquaculture facilities, reducing the need for chemical treatments, and ensuring a more natural and sustainable aquatic environment.