Step 01: Understanding Membrane Fouling Mechanisms
Reverse osmosis membranes represent the technological heart of industrial water purification. Over time, feed water impurities accumulate on the polyamide thin-film composite surface, causing reduced permeate flux and increased electrical conductivity.
Step 02: Four Primary Fouling Classifications
Stainless Steel CIP Skid for High-Pressure Reverse Osmosis Membranes⚙️ Metavel Industries OEM Standard
- ✓Inorganic Scaling: Precipitation of calcium carbonate (CaCO3), calcium sulphate (CaSO4), and silica when solubility limits are exceeded.
- ✓Colloidal & Silt Fouling: Deposition of clay, silt, colloidal silica, and organic macromolecules on the lead elements.
- ✓Biofouling: Formation of bacterial biofilm matrices on the feed spacer and membrane active layer.
- ✓Organic Fouling: Adsorption of naturally occurring organic matter (NOM) and humic acids.
Step 03: Step-by-Step CIP Protocol (Low pH Acid & High pH Alkaline)
| CIP Phase | Chemical Agent | Target Temperature | Primary Target |
|---|---|---|---|
| Phase 1: Acid Cleaning | 0.2% Citric Acid or 0.1% HCl (pH 2.0 - 2.5) | 30°C – 35°C | Dissolves inorganic scale & metal hydroxides |
| Phase 2: Intermediate Flush | RO Permeate Water (Zero Chlorine) | Ambient | Rinses residual acid out of pressure vessels |
| Phase 3: Alkaline Cleaning | 0.1% NaOH + 0.025% Na-EDTA (pH 11.0 - 11.5) | 35°C – 40°C | Disperses bio-film, organic slime & silts |
| Phase 4: Final Permeate Rinse | Pure RO Water Flush until pH stabilizes (6.5-7.5) | Ambient | Restores operating osmotic equilibrium |
Pure Nature · Mineral EnrichedPurity That Connects Generations
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