Plate Fouling
Biological Growth and Scale
Fouling is the gradual coating of plate surfaces by biofilm, algae or mineral scale, which reduces sludge shedding and effective area.
Understanding the Problem
Unlike clogging (physical blockage), fouling is a surface phenomenon. Biofilm and algae thrive where nutrients and light are available; scale forms in hard or chemically dosed waters.
Fouled plates lose their smooth, self-cleaning surface, so sludge adheres and effective area falls. Stainless steel resists fouling better than many plastics and is easier to clean.
A combination of periodic cleaning and, where relevant, covering the unit against light controls most fouling.
Common Symptoms
- ›Slimy or scaled plate surfaces
- ›Gradual capacity decline
- ›Sludge sticking to plates
- ›Odour from biological growth
Causes & Corrective Actions
Cause
Biofilm / algae growth
Corrective Action
Periodic cleaning; cover open units to exclude light.
Cause
Mineral scale in hard/dosed water
Corrective Action
Acid or chemical cleaning; review dosing chemistry.
Cause
Nutrient-rich, warm water
Corrective Action
Increase cleaning frequency; manage upstream nutrients.
Cause
Rough or degraded plate surface
Corrective Action
Use smooth stainless plates that resist adhesion.
Prevention
Related Pages
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