Aquaculture Water Treatment

Aquaculture Water Treatment

Electrochemical Oxidation in the Recirculating Aquaculture Systems Industry



Electrochemical Oxidation in the Recirculating Aquaculture Systems Industry

MMC First Process has long experience in water treatment solutions for live fish carriers, land-based holding tanks and chilling tanks, to mention a few. New in our product range is now ELOXIRAS, which removes TAN from the water in a reliable and cost-efficient manner. TAN (total ammonia nitrogen) is the total amount of nitrogen in the forms of ammonia (NH3) and ammonium ions (NH4+) in water. TAN is a metabolic waste product by the fish and the primary source is the fish feed, and NH3 is toxic to the fish and therefore important to keep below dangerous levels.

This complete water treatment system for aquaculture is applicable to a wide range of RAS systems, with extensive benefits. ELOXIRAS is based on electrochemical oxidation technology and is an innovative process for the treatment and reutilization of marine and brackish water. Recirculating aquaculture systems (RAS) operate by filtering and removing water pollutants from the fish tanks so it can be reused. Marine RAS system is expensive to purchase and operate, and requires high biomass culture densities (kg/m3) that implies fast accumulation of toxic metabolized compounds in low water volumes, hence demanding significant volumes of fresh water. Thus, RAS end-users need cost-efficient technologies able to work under these conditions. ELOXIRAS is a one-of-a-kind solution to this challenge.

The water treatment is a 3-step process:

  • Pre-treatment by filtration of the water.
  • Main treatment by means of electrochemical oxidation reactors for the removal of ammonia, nitrite, organic matter, and pathogens.
  • Post-treatment for the elimination of oxidation by-products and the balance of gases.

The solution is modular and scalable from small setups to treatment of tanks with up to 21600g TAN/day.

ELOXIRAS even work for low-salinity applications and has been successfully tested down to 2.5‰ (2.5 ppt) on rainbow trout. 



Based on the electrochemical oxidation technology, it only requires an electrical potential between two electrodes in water (Power).


Electrochemical oxidation compared to conventional water treatments

High efficiency
Contributing to increase RAS capacity and productivity in a cost effective way.

Safe process
High safety for the farmed species, ideal for isolated applications as quarantine and bio-security.

Easy to operate
Allowing to reach 100% of performance without start-up and adapting periods, typical of the biological systems.

Compact design
Allowing to save investment costs and to maximize the integration possibilities. 

Low environmental impact
The impact of the RAS is minimized due to lower water exchange requirements with the surrounding media. 

Removal of pollutants and disinfection in one step
Ensuring the elimination of high concern pollutants, such as TAN, nitrite and organic matter, while simultaneously providing in-situ disinfection in one single stage.

Easy automation
Possibility of including control system with remote alert procedures and supervision of the system condition and operation. 

Efficient energy process
Adaptable to optimize energy through a fine adjustment of the treatment intensity to the daily change og the pollutant production rate.

Modular and easy to scale-up
Allowint to increase the treatment capacity with maximum simpicity and minimum investment cost.


Sign up to our newsletter