1、 Daily maintenance specifications for titanium anodes in sewage treatment

1. Surface cleaning and descaling

Regularly rinse the surface of the titanium anode with pure water to remove residual electrolyte and avoid corrosion of the coating and substrate.

To address the issue of scaling, dilute hydrochloric acid immersion cleaning is used, and the use of strong alkaline solutions or sharp tools for scraping is prohibited to prevent coating detachment.

For sediment or biological attachment, use a soft bristled brush or neutral cleaner to clean, and if necessary, use ultrasonic or chemical cleaning.

2. Performance monitoring and inspection

Regularly check the anodic oxygen/chlorine evolution potential, current output stability, and polarization potential to determine whether the coating activity has declined.

Check the integrity of the surface coating. If peeling, scratches, or mechanical damage are found, evaluate whether local repair or overall replacement is needed.

3. Electrolyte management

Keep the electrolyte clean, filter or replace it regularly to avoid impurities depositing and causing short circuits or coating failure.

Control the electrolyte temperature to ≤ 45 ℃ and pH value within the process range to prevent accelerated coating loss in high temperature or extreme acid-base environments.

4. Shutdown maintenance

When not in use for a long time, the titanium anode should be thoroughly cleaned and dried, and stored in a ventilated, non corrosive gas environment.

Before resuming operation, check if the connection points are oxidized or loose, and if necessary, clean or polish the conductive surface with alcohol.

2、 Replace the operating specifications

1. Preparation before replacement

Power outage and safety protection: Turn off the power and lock the equipment, wear protective gloves, goggles, and helmets, and ensure good ventilation in the operating area.

Tools and spare parts: Prepare specialized tools such as cranes, adjusting bolts, insulation tape, etc., and confirm that the new anode model is consistent with the old part.

2. Dismantling of old anode

Drain the liquid from the electrolytic cell and clean the sediment. Use a dedicated lifting device to slowly lower the old anode to avoid collision or compression.

Check the corrosion condition of the disassembled anode substrate. If the titanium substrate is severely deformed or perforated, the electrolytic cell status should be evaluated simultaneously.

3. New anode installation

When hoisting a new anode, ensure that the direction is consistent with the current distribution design, and fix it in the center position of the electrolytic cell by adjusting the bolt.

Copper crimping terminals should be used for connecting wires to ensure low impedance of the contact surface, and insulation materials should be wrapped to prevent oxidation.

4. Debugging and acceptance

Add electrolyte to the specified level, eliminate bubbles, and then turn on electricity to monitor whether the initial current density is stable.

Record parameters such as slot voltage and current efficiency. If there are abnormal fluctuations, check for connection or coating defects.

3、 Key precautions

Safe operation: Replacement requires the cooperation of at least 2 people, with one person operating and the other supervising. Live working or crossing equipment in violation of regulations is prohibited.

Coating protection: Avoid media such as fluoride ions and phosphate ions from contacting the titanium substrate, otherwise iridium tantalum mixed oxide coating should be used to enhance corrosion resistance.

Life management: Develop a replacement plan based on the design life and performance degradation rate, prioritizing the replacement of anodes with coating loss ≥ 30%.