MMO (Ru-Ir) Anode Assembly For Seawater Aquaculture

NAVI Titanium self-developed MMO (Ru-Ir) anode assembly for seawater aquaculture uses a ruthenium-iridium mixed metal oxide coating on a high-purity titanium base. It performs outstandingly as a chlorine evolution catalyst even in highly chlorinated, strongly corrosive seawater conditions. It's the core electrochemical component for in-situ electrolysis of seawater in fish, shrimp, and shellfish farming tanks to produce hypochlorite, disinfect water, control algae, and break down harmful bacteria and ammonia nitrogen.

We handle the whole production chain ourselves-from base material processing and coating sintering to assembly packaging - supporting custom specifications, bulk supply, and technical support. We offer a stable procurement channel for aquaculture equipment manufacturers, farming project integrators, and water treatment system providers, delivering long-lasting, energy-efficient anode solutions with consistent performance to help maintain stable water quality and reduce disease risk.

With the electrochemical industry continuously moving towards high efficiency, long lifespan, and customized solutions, MMO mixed metal oxide titanium anodes have become key electrochemical components in applications like electrolysis, oxidation, and corrosion protection. NAVI Titanium leverages its mature coating development and precision manufacturing technology to create a series of MMO titanium anode products tailored to different electrolyte environments, current densities, and usage needs, ensuring an exact match between coating solutions and application scenarios, and overcoming the common issues of generic anodes like poor adaptability, rapid decay, and short lifespan.

The electrode spacing, number of stacked sheets, lead terminal type, and mounting holes can all be customized as needed. The insulating components resist electrolyte corrosion, effectively preventing short circuits between electrodes and ensuring long-term stable operation of the entire anode assembly. The coating goes through multiple layers of application and stepwise high-temperature sintering, giving it strong adhesion, resistance to erosion and oxidation, stable slot voltage, and controllable energy consumption, significantly extending the service life of the whole set of electrodes.

MMO (Ru-Ir) anode assembly for seawater aquaculture made by NAVI Titanium is built on a high-purity titanium base and coated with a ruthenium-iridium mixed metal oxide layer, which directly helps clean and adjust the aquaculture water through electrochemical processes.

The most common and core application in aquaculture is in-situ electrolytic production of hypochlorous acid for water disinfection. When MMO (Ru-Ir) anodes are used to electrolyze seawater, a highly efficient chlorine evolution reaction occurs on the anode surface, converting chloride ions in the seawater into chlorine gas, which quickly hydrolyzes into hypochlorous acid. Thanks to its strong oxidizing ability, hypochlorous acid can directly destroy the cellular structures of bacteria, viruses, fungi, and other microorganisms, achieving broad-spectrum sterilization. The key advantage of this process lies in its immediacy and in-situ nature: the anode components are placed directly in the circulating water system or aquaculture ponds, and the active chlorine produced by electrolysis is released on-site. This avoids the cumbersome steps of transportation, storage, dosage, and residue control associated with traditional chemical disinfectants.

For aquaculture operators, this means that during routine water changes, pond draining, or pond transfers, they don't need to rely heavily on external disinfectants; they can continuously and controllably disinfect incoming seawater, which is especially useful for large-scale farms with high water turnover and frequent batch changes. More importantly, MMO (Ru-Ir) anodes have low chlorine evolution potential and high current efficiency, producing more active chlorine for the same energy consumption. This means farms can achieve more stable disinfection with less electricity, which directly translates into measurable operational benefits for farms where electricity costs matter and operations run year-round.

The entire titanium anode production process is tightly interconnected: First, we carefully select high-purity titanium substrates and use laser cutting equipment for precise material cutting, processing them into plate, tube, or mesh blanks according to customer specifications. Next, the blanks go through surface pretreatment, where sandblasting and acid cleaning remove oxide scales and grease from the titanium surface, creating a rough, activated base that ensures excellent adhesion for the precious metal coating and prevents peeling later on. After pretreatment, the technical team prepares a customized precious metal precursor solution based on the customer's working conditions, accurately mixing active components like iridium and ruthenium. Skilled workers then evenly brush this onto the titanium substrate surface, which is fired in a high-temperature furnace in stages; repeated coating and sintering form a dense, stable mixed metal oxide catalytic layer. Once all steps are completed, products undergo spot checks for electrochemical performance. Qualified items are then packaged securely and prepared for shipment.

A transparent and visible production process is the foundation of NAVI Titanium's commitment to product quality. You can click to see more details of our process and learn how we use precise manufacturing to provide global customers with cost-effective, long-lasting, customized titanium anodes.

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MMO (Ru-Ir) anode assembly for seawater aquaculture are mainly applied to electrolyze seawater to generate sodium hypochlorite, for water disinfection, pathogen control and biofouling prevention. The table below compares NAVI Titanium products with similar offerings in the industry from core technical and commercial perspectives:

The most common and core application in marine aquaculture is in-situ electrolysis to produce hypochlorous acid for disinfecting water. MMO (Ru-Ir) anodes efficiently perform chlorine evolution on the anode surface when electrolyzing seawater, converting chloride ions in the water into chlorine gas, which quickly hydrolyzes into hypochlorous acid. Thanks to its strong oxidation ability, hypochlorous acid can directly break down the cellular structures of bacteria, viruses, fungi, and other microorganisms, achieving broad-spectrum sterilization. The key advantages of this process are its immediacy and in-situ nature: anode components are placed directly in circulating water systems or aquaculture pond water, releasing active chlorine on site and avoiding the complicated steps of transporting, storing, mixing, and controlling residues typically associated with traditional chemicals. For aquaculture operators, this means that during routine operations like water exchange, pond draining, or transferring fish, seawater entering the system can be continuously and flexibly disinfected without frequently relying on external disinfectants.

This is especially suitable for large-scale farms with high water flow and frequent batch changes. Moreover, MMO (Ru-Ir) anodes have low chlorine evolution potential and high current efficiency, producing more effective chlorine with the same energy consumption. For farms sensitive to electricity costs and operating year-round, this translates directly into measurable operational benefits.

Beyond microbial control, MMO (Ru-Ir) anode components are also key for organic matter oxidation and water purification. Residual feed, feces, and metabolic waste in aquaculture water release ammonia, nitrite, and various organic pollutants continually. When accumulated, these substances not only deplete dissolved oxygen but also can be toxic to aquatic animals, often causing disease outbreaks and water quality deterioration. The active chlorine produced during electrolysis, along with highly reactive oxidative intermediates formed on the anode, can oxidize and break down these pollutants, promoting the conversion of ammonia into harmless forms and helping maintain nitrogen cycle balance in the water.

This function is especially important in high-density, recirculating aquaculture systems, where water is reused, pollutants accumulate, and relying solely on biological filters is often insufficient for quickly handling the load. Electrolytic oxidation offers a fast and powerful supplemental treatment route. Combining MMO (Ru-Ir) anodes with biological filtration, protein separation, and other facilities can create a multi-stage purification setup, providing more buffer capacity and purification redundancy during feed peaks, limited water exchange, or sudden temperature fluctuations, preventing short-term water quality drops that could trigger aquaculture issues.

MMO (Ru-Ir) anode assembly for seawater aquaculture, algae spores and plankton in seawater can quickly multiply under sufficient light and rich nutrients, leading to water blooms or biofouling in aquaculture facilities. Overgrown algae compete with farmed animals for oxygen and space, and decaying algae may release toxins that worsen water quality. Biofouling on facility surfaces can clog nets, reduce water exchange, and increase cleaning work. The active chlorine environment produced by electrolysis can effectively inhibit the germination and growth of algae spores. Additionally, the locally high oxidative environment around the anode can suppress and remove attached organisms, helping reduce water blooms and significantly cut down on fouling on nets, pond walls, and pipes. For cage and pond farming, this means fewer net changes, less frequent pond cleaning, and lower reliance on chemicals. Long-term anti-fouling and anti-corrosion effects ensure smooth water flow throughout the farming cycle, providing farmed animals with a more stable and healthier growth environment.

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