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Oct 30, 2025
When press filter cloth experiences leakage or turbidity in the filtrate, follow the steps below for troubleshooting:
Always cloudy filtrate: Likely caused by filter cloth damage, improper cloth selection (pore size too large), or damaged filter plates/sealing surfaces.
Cloudy only at the beginning, then clear: This is normal. However, if turbidity lasts longer than 1 minute, it may indicate slow cake formation. Check whether the feed pressure is too high, particle size too fine, or if a filter aid is required.
Check the press filter cloth: Remove the cloth and inspect under bright light or with a flashlight to identify holes, thinning, or thread pulls. This is the fastest and most direct method.
Check the filtrate outlet: If cloudy liquid comes consistently from one or two chambers only, while others remain clear, the issue is most likely with that specific filter cloth or plate.
Check the filter plate/frame: Inspect the suspected chamber's plate and frame sealing surface for cleanliness, residue, wear, or cracks.
Review process changes: Determine whether there have been recent changes in raw materials, formulations, or process conditions.
Analyze the feed material: Perform particle size analysis to check for increased fine particles.
Evaluate operating conditions: Check the feed pump pressure curve to see if initial pressure control is appropriate.
Replace the filter cloth: If damaged, replace immediately. Before installation, inspect the filter plate edges and polish away burrs.
Re-select filter cloth: If repeated leakage occurs without visible cloth damage, consult a professional filter cloth supplier for re-selection. You may need a denser fabric, smaller pore size, or different material/weave type.
Process adjustments:
Reduce initial feed pressure and increase gradually.
Consider adding with filter aid.
Increase feed concentration (if possible) to accelerate cake formation.
Equipment maintenance: Repair or replace damaged filter plates and frames.
Solving filter cloth leakage problems requires a "simple to complex" approach. Start by checking the most obvious causes such as filter cloth and filter plates, then move on to material analysis and process optimization. This ensures efficient solid-liquid separation and stable equipment performance.
