How Long Is The Maintenance Cycle Of The Iron And Manganese Removal Filter?

The maintenance cycle for iron and manganese removal filters is not fixed and needs to be adjusted based on the influent water quality (iron and manganese content, turbidity, and pollutant composition), the equipment operating load (daily water processing volume), the filter media type, and local climatic conditions. The core principle is "prevention first, dynamic optimization based on actual operating conditions." The following summarizes the general cycles and corresponding contents according to the maintenance level (daily, regular, and long-term):

1. Daily maintenance (daily /

This is high-frequency basic maintenance, and its purpose is to detect immediate problems in a timely manner and avoid the accumulation of minor faults.

: Before starting the equipment each time, check whether the switch status of each valve (water inlet valve, water outlet valve, backwash valve, exhaust valve, etc.) is normal and whether there is any leakage; whether the pressure gauge and flow meter readings are zero or in the normal initial range; whether the power supply and operating noise of the backwash water pump (if any) and air compressor (air-water combined flushing model) are normal.

Monitoring during operation: Record the inlet and outlet pressure difference (normal range is usually <0.05MPa, if it exceeds 0.1MPa, be alert to filter layer blockage), outlet water iron and manganese content (national standards require iron ≤0.3mg/L, manganese ≤0.1mg/L), turbidity and inlet flow rate at regular intervals daily (recommended every 2-4 hours). Observe the appearance of the filter tank for leakage and abnormal sounds, and check the backwash drainage water quality (if backwashing is performed on the same day) to ensure it is clear.

Clean up after shutdown: If the equipment stops running that day (not in a 24-hour continuous operation scenario), close the water inlet and outlet valves, and open the exhaust valve to release the residual pressure in the tank; clean up debris and accumulated water around the equipment and on the operation panel, keep the operating environment dry and clean, and avoid rust on the valve body or moisture on electrical components.

2. Regular maintenance (every

For the core components of the equipment (filter materials, valves

Check the backwash system: test the start and stop response speed of the backwash water pump, whether the water outlet pressure is stable, and clean the water pump inlet filter (to avoid impurities blocking and causing insufficient flushing intensity); if it is a combined air and water flush, check the drainage of the air compressor air tank (to remove condensed water and prevent air line corrosion), and test the opening and closing flexibility of the intake valve.

Valve maintenance: Apply grease (such as Vaseline or special valve lubricant) to the valve stems of all manual valves to avoid jamming caused by long-term switching; check whether the control line connectors of electric valves are loose, and whether the switching between remote control and on-site manual operation is smooth.

Monthly maintenance:
Check the status of the filter layer: open the manhole on the top of the filter tank (empty the water in the tank and release the pressure first), observe whether the filter material layer is flat, and whether there are obvious depressions, protrusions or "hardening" (local filter material agglomeration, mostly due to incomplete backwashing or high turbidity of the incoming water); randomly sample and check whether there is a large amount of yellow-brown iron mud attached to the surface of the filter material (such as manganese sand). If the filter material particles are severely adhered, shorten the backwash cycle or increase the flushing intensity.

Instrument calibration: calibrate pressure gauges (compare readings with a standard pressure gauge; adjustments are required if the error exceeds ±0.01 MPa), flow meters (timed water collection in a container of known volume to verify actual flow rate against displayed value), and online water quality monitors (e.g., iron and manganese detectors, calibrated with standard solutions to ensure accurate readings).

Quarterly maintenance:

In-depth inspection of auxiliary equipment: disassemble the impeller and seal of the backwash water pump, clean the iron mud or impurities attached to the impeller, and check whether the seal is aging (if there is water leakage or wear, it needs to be replaced); check the filter element of the air compressor (air filter element, oil filter element, if it is an oil-free air compressor, focus on checking the air filter element). If it is blocked or seriously dirty, replace it directly with a new filter element.

Pipe cleaning: Clear the backwash inlet pipe and drain pipe. Use a high-pressure water gun to flush the inner wall (avoid using corrosive agents) to remove iron mud or scale deposited in the pipe (especially in areas with hard water, where scaling in the pipe affects flow). Check the flange gaskets at the pipe interface. If they are aging or deformed, replace them in time to prevent leakage.

3. Long-term maintenance (every

Components with long life cycles, such as filter media, core valves, and control systems, need to be replaced or overhauled based on actual wear and tear to ensure long-term operational efficiency of the equipment.

Semi-annual maintenance:

Filter media performance evaluation: Take samples to test the effective ingredient content of the filter media (such as manganese sand) (the MnO₂ content in manganese sand should be ≥35%; if it is less than 25%, the adsorption capacity will be greatly reduced), and measure the thickness of the filter media layer (if the thickness decreases by more than 10% due to long-term backwashing loss, new filter media of the same specification must be added); if a large amount of filter media is broken (the proportion of particles with a particle size less than 1/2 of the original specification exceeds 30%), the filter media must be partially replaced (the replacement amount is generally 1/3-1/2 of the total filter media volume).

Control system inspection: Dust the PLC control cabinet (if it is an automatic control model), check whether the internal wiring terminals are loose and whether the contactor contacts are burned; test whether the execution logic of the automatic backwash program (such as pressure difference trigger, time trigger) is normal, and adjust the parameters (such as backwash duration, interval period) to match the current inlet water quality.

Annual maintenance (annual overhaul):

Overall equipment inspection: Perform a water pressure test on the filter tank (the test pressure is 1.25-1.5 times the working pressure, and the pressure is maintained for 30 minutes without leakage). Check whether the tank body has corrosion and weld cracks; verify all safety accessories (such as safety valves, if the equipment is running under pressure) to ensure their sensitive and reliable operation.

Precautions

Maintenance cycles need to be adjusted dynamically: If the inlet water turbidity is >10 NTU for a long time (or the iron and manganese content far exceeds the design value), weekly maintenance needs to be upgraded to once every 3-5 days, and monthly filter media inspection needs to be upgraded to once every 2 weeks; if the equipment runs continuously for 24 hours, the regular maintenance interval needs to be shortened by 20%-30%.
Recording and tracing: Each maintenance must record the time, content, model of replaced parts, test data, etc. in detail to form a maintenance file. By comparing the operating parameters of different cycles (such as pressure difference changes, filter material loss rate), the maintenance frequency can be gradually optimized to avoid excessive or insufficient maintenance.