Ozone and ultraviolet disinfection in aquaculture. Fish farm water treatment

1. Ozone Disinfection in RAS Aquaculture:

Ozone Generation: Ozone is generated on-site using ozone generators. Common methods include corona discharge and UV radiation. The ozone generator converts oxygen (O2) into ozone (O3).

Ozone Injection: Ozone is introduced into the water within the RAS system. It can be injected directly into the water flow using ozone contactors or diffusers. The ozone is distributed throughout the water column.

Disinfection: Ozone is a powerful disinfectant that effectively kills bacteria, viruses, parasites, and other microorganisms in the water. It disrupts their cell membranes and metabolic processes.

Organic Matter Oxidation: Ozone also oxidizes organic matter, including fish waste, uneaten feed, and dissolved organic compounds, which can accumulate in RAS systems. This helps maintain water quality.

Microparticle Flocculation: Ozone can promote the flocculation of microparticles and suspended solids in the water, aiding in their removal through mechanical filtration.

2. UV Disinfection in RAS Aquaculture:

UV Sterilization Units: UV sterilizers or UV lamps are installed in the RAS system’s water circulation loop. Water passes through these units, exposing it to UV-C light.

UV-C Disinfection: UV-C light is germicidal and can effectively inactivate microorganisms by damaging their DNA or RNA, preventing replication.

Pathogen Control: UV disinfection targets a wide range of waterborne pathogens, including bacteria, viruses, and parasites, reducing the risk of disease outbreaks among the farmed fish.

3.Benefits of Ozone and UV in RAS Aquaculture:

Effective Disinfection: The combined use of ozone and UV provides robust disinfection capabilities, ensuring that waterborne pathogens are effectively controlled.

Improved Water Quality: Ozone oxidation helps maintain water quality by breaking down organic matter and improving clarity. UV reduces organic load by eliminating pathogens.

Reduced Disease Risks: The use of ozone and UV reduces the risk of disease outbreaks among farmed fish, leading to healthier stock.

Sustainability: RAS systems are known for their sustainability, as they recycle water, minimize environmental impact, and optimize resource use. Ozone and UV contribute to this sustainability by minimizing the need for chemical treatments.

Environmental Safety: Unlike some chemical disinfectants, ozone and UV do not leave harmful residues or byproducts in the water, making them environmentally friendly choices.

Cost-Effective: While there is an initial investment in ozone and UV equipment, these systems can provide long-term cost savings by reducing the need for chemical treatments and minimizing disease-related losses.